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Significant enhancement of crystallization kinetics of polylactide in its immiscible blends through an interfacial effect from comb-like grafted side chains

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Science China Chemistry 2016年第5期59卷 609-618页

作者： Yin Chen Yaqiong Zhang Feng Jiang Junyangwang zhaohua {2. zhigang wang cas key {2. of Soft Matter Chemistry Hefei National Laboratory for Physical Sciences at the MicroscaleDepartment of Polymer Science and EngineeringUniversity of Science and Technology of ChinaHefei 230026China Department of Material Technology Jiangmen PolytechnicJiangmen 529090China

A significant enhancement in isothermal crystallization kinetics of biodegradable polylactide(PLA) in its immiscible blends can be accomplished through blending it with a comb-like copolymer. PLA was blended with poly(ethylene glycol) methyl ether acrylate(PEGA) and poly[poly(ethylene glycol) methyl ether acrylate](PPEGA, a comb-like copolymer), respectively. The results measured from phase contrast optical microscopy(PCOM) and differential scanning calorimetry(DSC) indicate that PLA and PEGA components are miscible, whereas PLA and PPEGA components are immiscible. The study of crystallization kinetics for PLA/PEGA and PLA/PPEGA blends by means of polarized optical microscopy(POM) and DSC indicates that both PEGA and PPEGA significantly increase the PLA spherulitic growth rates, G, although PLA/PPEGA blends are immiscible and the glass transition temperatures of PLA only have slight decreases. PPEGA component enhances nucleation for PLA crystallization as compared with PEGA component owing to the heterogeneous nucleation effect of PPEGA at the low composition of 2. wt%, while PLA crystallization-induced phase separation for PLA/PEGA blend might cause further nucleation at the high composition of 50 wt%. DSC measurement further demonstrates that isothermal crystallization kinetics can be relatively more enhanced for PLA/PPEGA blends than for PLA/PEGA blends. The "abnormal" enhancement in G for PLA in its immiscible blends can be explained by local interfacial interactions through the densely grafted PEGA side chains in the comb-like PPEGA, even though the whole blend system(PLA/PPEGA blends) represents an immiscible one.

关键词： biodegradable polymer spherulite growth rate phase separation nucleation

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Improving dispersion of multiwalled carbon nanotubes in polylactide via grafting five hydroxyl-terminated polylactide

Improving dispersion of multiwalled carbon nanotubes in poly...

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4th International Symposium on Engineering plastics

作者： zhaohua xu {2. wang~* cas key laboratory of Engineering plastics Beijing National laboratory for Molecular Sciences Institute of Chemistry Chinese Academy of Sciences Beijing 100190 China

＜正＞Polylactide（PLA）,as a biodegradable polymer,is drawing increasing attention due to academic and commercial ***,the preparation of polymer nanocomposites with carbon nanotubes（CNTs） has already been proved to be an effective way to modify the polymers[1-5].Therefore,the combination of PLA and CNTs is expected to form nanocomposites with enhanced ***,the

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Sustainable, thermoplastic and hydrophobic coating from natural cellulose and cinnamon to fabricate eco-friendly catering packaging

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Green Energy & Environment 2024年第5期9卷 927-936页

作者： Rumeng xu Chunchun Yin Jingxuan You Jinming Zhang Qinyong Mi Jin Wu Jun Zhang cas key {2. of Engineering plastics Institute of ChemistryChinese Academy of Sciences(CAS)Beijing100190China University of Chinese Academy of Sciences Beijing100049China

Non-degradable polymers cause serious environmental pollution problem,such as the widely-used while unrecyclable coatings which signiﬁcantly affect the overall degradation performance of *** is imperative and attractive to develop biodegradable functional ***,we proposed a novel strategy to successfully prepare biodegradable,thermoplastic and hydrophobic coatings with high transparence and biosafety by weakening the interchain interactions between cellulose *** natural cellulose and cinnamic acid were as raw *** reducing the degree of polymerization(DP)of cellulose and regulating the degree of substitution(DS)of cinnamate moiety,the obtained cellulose cinnamate(CC)exhibited not only the thermalﬂow behavior but also good biodegradability,which solves the conﬂict between the thermoplasticity and biodegradability in cellulose-based *** glass transition temperature(T_(g))and thermalﬂow temperature(T_(f))of the CC could be adjusted in a range of 150–2.0℃ and 180–2.0℃,*** CC with DS2.and DP≤100 degraded more than 60%after an enzyme treatment for 7 days,and degraded more than 80%after a composting treatment for 42.***,CC had no toxicity to human epidermal cells even at a high concentration(0.5 mg mL^(-1)).In addition,CC could be easily fabricated into multifunctional coating with high hydrophobicity,thermal adhesion and high ***,after combining with cellophane and paperboard,CC coating with low DP and DS could be used to prepare fully-biodegradable heat-sealing packaging,art paper,paper cups,paper straws and food packaging boxes.

关键词： Thermoplastic coating Bio-degradable adhesive Natural products Cellulose Eco-friendly packaging

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Unravelling biosynthesis and biodegradation potentials of microbial dark matters in hypersaline lakes

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Environmental Science and Ecotechnology 2024年第4期20卷 177-188页

作者： Zhiguang Qiu Yuanyuan Zhu Qing Zhang xuejiao Qiao Rong Mu Zheng xu Yan Yan Fan {2. Tong Zhang Wei-Qin Zhuang Ke Yu School of Environment and Energy Peking University Shenzhen Graduate SchoolShenzhen518055China AI for Science(AI4S)-Preferred Program Peking UniversityShenzhen518055China Southern University of Sciences and Technology Yantian Hospital Shenzhen518081China Institute of Biomedicine and Biotechnology Shenzhen Institute of Advanced TechnologyChinese Academy of SciencesShenzhen518055China State key laboratory of Isotope Geochemistry CAS Center for Excellence in Deep Earth ScienceGuangzhou Institute of GeochemistryChinese Academy of SciencesGuangzhou510640China School of Atmospheric Sciences Sun Yat-sen UniversitySouthern Marine Science and Engineering Guangdong Laboratory(Zhuhai)Zhuhai519082China Department of Civil Engineering University of Hong Kong999077Hong KongChina Department of Civil and Environmental Engineering Faculty of EngineeringUniversity of AucklandNew Zealand

Biosynthesis and biodegradation of microorganisms critically underpin the development of biotechnology,new drugs and therapies,and environmental ***,most uncultured microbial species along with their metabolic capacities in extreme environments,remain *** we unravel the metabolic potential of microbial dark matters(MDMs)in four deep-inland hypersaline lakes in Xinjiang,*** metagenomic binning,we uncovered a rich diversity of 3030 metagenomeassembled genomes(MAGs)across 82.phyla,revealing a substantial portion,2.63 MAGs,as previously unclassified at the genus *** unknown MAGs displayed unique distribution patterns across different lakes,indicating a strong correlation with varied physicochemical *** analysis revealed an extensive array of 9635 biosynthesis gene clusters(BGCs),with a remarkable 9403 being novel,suggesting untapped biotechnological ***,some MAGs from potentially new phyla exhibited a high density of these *** biosynthesis,our study also identified novel biodegradation pathways,including dehalogenation,anaerobic ammonium oxidation(Anammox),and degradation of polycyclic aromatic hydrocarbons(PAHs)and plastics,in previously unknown microbial *** findings significantly enrich our understanding of biosynthesis and biodegradation processes and open new avenues for biotechnological innovation,emphasizing the untapped potential of microbial diversity in hypersaline environments.

关键词： Biosynthesis Biodegradation Hypersaline lakes Metagenome-assembled genomes Microbial dark matters

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Genome Warehouse: A Public Repository Housing Genome-scale Data

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Genomics, Proteomics & Bioinformatics 2021年第4期19卷 584-589页

作者： Meili Chen Yingke Ma Song Wu Xinchang Zheng Hongen Kang Jian Sang Xingjian xu Lili Hao zhaohua Li Zheng Gong Jingfa Xiao Zhang Zhang Wenming Zhao Yiming Bao National Genomics Data Center Beijing Institute of GenomicsChinese Academy of Sciences/China National Center for BioinformationBeijing 100101China cas key {2. of Genome Sciences and Information Beijing Institute of GenomicsChinese Academy of SciencesBeijing 100101China University of Chinese Academy of Sciences Beijing 100049China Division of Cancer Epidemiology and Genetics National Cancer InstituteNational Institutes of Health.Bethesda.MD 20X92.USA College of Computer Science Technology Inner Mongolia Normal UniversityHohhot 010010China

The Genome Warehouse(GWH)is a public repository housing genome assembly data for a wide range of species and delivering a series of web services for genome data submission,storage,release,and *** one of the core resources in the National Genomics Data Center(NGDC),part of the China National Center for Bioinformation(CNCB;https://***),GWH accepts both full and partial(chloroplast,mitochondrion,and plasmid)genome sequences with different assembly levels,as well as an update of existing genome *** each assembly,GWH collects detailed genome-related metadata of biological project,biological sample,and genome assembly,in addition to genome sequence and *** archive high-quality genome sequences and annotations,GWH is equipped with a uniform and standardized procedure for quality *** basic browse and search functionalities,all released genome sequences and annotations can be visualized with *** May 2.,2.2.,GWH has received 19,12. direct submissions covering a diversity of 1108 species and has released 8772.of ***,GWH serves as an important resource for genomescale data management and provides free and publicly accessible data to support research activities throughout the *** is publicly accessible at https://***/gwh.

关键词： Genome submission Genome sequence Genome annotation Genome Warehouse Quality control

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IC4R-2.0:Rice Genome Reannotation Using Massive RNA-seq Data

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Genomics, Proteomics & Bioinformatics 2020年第2期18卷 161-172页

作者： Jian Sang Dong Zou Zhennan wang Fan wang Yuansheng Zhang Lin Xia {2. Li Lina Ma Mengwei Li Bingxiang xu Xiaonan Liu Shuangyang Wu Lin Liu Guangyi Niu Man Li Yingfeng Luo Songnian Hu Lili Hao Zhang Zhang cas key {2. of Genome Sciences and Information Beijing Institute of GenomicsChinese Academy of SciencesBeijing 100101China National Genomics Data Center Beijing Institute of GenomicsChinese Academy of SciencesBeijing 100101China University of Chinese Academy of Sciences Beijing 100049China State key laboratory of Integrated Management of Pest Insects and Rodents Institute of ZoologyChinese Academy of SciencesBeijing 100101China Division of Cancer Epidemiology and Genetics National Cancer InstituteNational Institutes of HealthBethesdaMD 20892USA State key laboratory of Microbial Resources Institute of MicrobiologyChinese Academy of SciencesBeijing 100101China

Genome reannotation aims for complete and accurate characterization of gene models and thus is of critical significance for in-depth exploration of gene *** the availability of massive RNA-seq data provides great opportunities for gene model refinement,few efforts have been made to adopt these precious data in rice genome *** we reannotate the rice(Oryza sativa ***)genome based on integration of large-scale RNA-seq data and release a new annotation system IC4 *** general,IC4 R-2.0 significantly improves the completeness of gene structure,identifies a number of novel genes,and integrates a variety of functional ***,long non-coding RNAs(lncRNAs)and circular RNAs(circRNAs)are systematically characterized in the rice *** evaluation shows that compared to previous annotation systems,IC4 R-2.0 achieves higher integrity and quality,primarily attributable to massive RNA-seq data applied in genome ***,we incorporate the improved annotations into the Information Commons for Rice(IC4 R),a database integrating multiple omics data of rice,and accordingly update IC4 R by providing more user-friendly web interfaces and implementing a series of practical online ***,the updated IC4 R,which is equipped with the improved annotations,bears great promise for comparative and functional genomic studies in rice and other monocotyledonous *** IC4 R-2.0 annotation system and related resources are freely accessible at http://ic4 ***/.

关键词： Genome reannotation IC4R Rice RNA-seq Gene model

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A polypropylene melt-blown strategy for the facile and efficient membrane separation of oil-water mixtures

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Chinese Journal of Chemical Engineering 2021年第1期34卷 383-390页

作者： Zhenqiang Zhang Danfeng Yu Xiubin xu Huayi Li Taoyan Mao Cheng Zheng Jianjia Huang Hui Yang Zihan Niu xu Wu School of Chemistry and Chemical Engineering Guangzhou UniversityGuangzhou 510006China cas key Lab of Engineering {2. Institute of ChemistryChinese Academy of SciencesBeijing 100190China cas key Lab of Colloid Interface and Chemical ThermodynamicsInstitute of ChemistryChinese Academy of SciencesBeijing 100190China

Porous materials with selective wettability and permeability have significant importance in oil-water separation,but complex fabrication processes are typically required to obtain the desired structures with suitable surface *** this work,an industrial melt-blown strategy that utilized commercially available polypropylene(PP)was used for the large-scale fabrication of superhydrophobic/superoleophilic membranes with staggered fabric *** membranes could readily separate different oils including pump oil and crude oil from various aqueous solutions such as strongly acidic,alkaline,and saline *** addition,the separation efficiencies of these membranes exceeded 99%,and they could remain functional even after exposure to corrosive *** anticipate that this work will further the design of membranes and enhance their applicability in oil-water separation,and provide researchers and engineers with a more effective tool for performing challenging separations and mitigating pollution.

关键词： Separation Polypropylene membranes Surface Superhydrophobicity Superoleophilicity Environment

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Preparation of Porous Polylactide Microspheres and Their Application in Tissue Engineering

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Chinese Journal of Polymer Science 2018年第6期36卷 712-719页

作者： xu-Dong Shi Pei-Jian Sun Zhi-Hua Gan key laboratory of Polymer Ecomaterials Changchun Institute of Applied ChemistryChinese Academy of SciencesChangchun 130022China The GAS key laboratory of Engineering {2. Institute of ChemistryChinese Academy of Sciences(CAS)Beijing 100190China State key laboratory of Organic-inorganic Composites College of Life Science and TechnologyBeijing University of Chemical TechnologyBeijing 100029China

In this study, porous polylactide（PLA） microspheres with different structures were prepared through the multiple emulsion solvent evaporation method. By changing organic solvents（ethyl acetate and chloroform） and adding effervescent salt NH4 HCO3 in the inner water phase, microspheres with porous capsular, matrix, microcapsular and multivesicular structures were prepared. The protein encapsulation and release, and the cell growth behavior of porous microspheres were further explored. Under the same inner water phase, microspheres prepared with chloroform had higher protein encapsulation efficiency and less protein release rate as compared with those prepared with ethyl acetate. Cell experiments showed that the relatively rough surface of microspheres prepared with chloroform was more favorable for the cell growth in comparison with the smooth surface of microspheres prepared with ethyl acetate. This study shows a simple and effective method to control the protein release and cell growth behaviors of polymer microspheres by tuning their porous structure.

关键词： Polylactide Porous microspheres Drug release Cell Tissue engineering

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Cellulose Solubility in Deep Eutectic Solvents:Inspecting Quantitative Hydrogen-Bonding Analysis

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高分子科学：英文版 2023年第1期41卷 75-83页

作者： Kuang-Jie xu Bao-Qing Zhang Xin Qiao Chen-Yang Liu cas key {2. of Engineering plastics Beijing National Laboratory for Molecular SciencesInstitute of Chemistrythe Chinese Academy of SciencesBeijing100190China University of Chinese Academy of Sciences Beijing100049China

According to the Kamlet-Abraham-Taft(KAT)polarity parameters(α,β,π*),polymers and solvents can be categorized as hydrogen-bond(H-bond)acidic(α>β)or H-bond basic(α<β).Recently,we proposed a quantitative hydrogen bonding(QHB)analysis to predict the solubility of polymers in ionic liquids(ILs)using the product ofΔαΔβ<0 as an indicator,whereΔαis the difference between the H-bond acidic parameters of the polymer and IL,andΔβis the difference in their basicity,while the prerequisite of the“complementary”principle(i.e.,that one component is H-bond acidic and the other is basic)is ***,the applicability of QHB analysis was first confirmed by testing the solubilities of carefully chosen polymer/deep eutectic solvent(DES)pairs,as the DESs were eutectic mixtures dominated by hydrogen bonding ***,our attention focused on the solubility of cellulose in *** testing results as well as the typical published results were summarized,which indicate that the potential DESs for cellulose dissolution and regeneration must be of the H-bond basic type because the“complementary”principle should be satisfied as a ***,the H-bond basic DESs investigated in this study do not show the superior solubility of cellulose that has been commonly observed for H-bond basic ILs,even if the criterion ofΔαΔβ<0 is satisfied for both DESs and *** reasons for this discrepancy are given to understand the varying effectiveness in cellulose dissolution for H-bond basic DESs and ILs.

关键词： Deep eutectic solvent Cellulose dissolution Empirical polarity parameters Hydrogen bonding interaction

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Biodegradable Microspheres with Poly(N-isopropylacrylamide) Enriched Surface: Thermo-responsibility, Biodegradation and Drug Release

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Chinese Journal of Polymer Science 2015年第11期33卷 1598-1605页

作者： Yin Yuan 孙培健 xu-dong Shi Zhi-hua Gan 王佛松 cas key {2. of Engineering plastics Institute of Chemistry Chinese Academy of Sciences the key laboratory of Tobacco Chemistry Zhengzhou Tobacco Research Institute China National Tobacco Corporation State key laboratory of Organic-inorganic Composites Beijing Laboratory of Biomedical MaterialsCollege of Life Sciences and Technology

Microspheres with thermo-responsible surface were fabricated by PCL-b-PEO-b-PNIPAM triblock copolymers. Thermo-responsible morphological changes of PCL-b-PEO-b-PNIPAM microspheres immersed in aqueous solution at temperatures above the LCST（e.g. 37 ℃） were observed from porous surface structure to compact surface layer. Enzymatic degradation and in vitro drug release results showed that the thermo-responsible surface layer greatly influenced the degradation of microspheres as well as the drug release behavior from microspheres. With the copolymerization of PNIPAM block into PCL-b-PEO copolymers, the drug release could be well regulated by changing temperatures and microspheres composition, which revealed the great potentials of microspheres with thermo-responsible surface for controlled drug release.

关键词： Microspheres Poly(N-isopropylacrylamide) Thermo-sensitive Biodegradation

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