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聚集体(英文) 2023年第3期4卷 126-134页

作者： Tianhong Wu Wenhai Bian ChunhuiWang Jie Qiu Xiaolong Sun Xuhong Qian The Key Laboratory of Biomedical Information Engineering of Ministry of Education School of Life Science and TechnologyXi’an Jiaotong UniversityXi’anPeople’s Republic of China School of Nuclear Science and Technology Xi’an Jiaotong UniversityXi’anPeople’s Republic of China State Key Laboratory of Bioreactor Engineering Shanghai Key Laboratory of Chemical BiologySchool of PharmacyEast China University of Science and TechnologyShanghaiPeople’s Republic of China School of Chemistry and Molecular Engineering East China Normal UniversityShanghaiPeople’s Republic of China

The creation of a new photoluminescent platform to study their photo physics and further applications is important in the fields of chemistry,material,physics,*** this work,we developed benzene-based fluorophores generated by chemical reactions on conjugate acceptor *** optical properties have been studied,and the large Stokes shifts,high molar extinction coefficients and quantum yields have been *** starting precursors containing bis-intercalated vinyl thioester shows no luminescence,which is turned on by the chemically triggered *** spectroscopic,crystallographic,and computational studies,cyclization-induced emission enhancement is proposed as a mean to explain the photoluminescent performances,a principle extended in the substituent incorporated ***,they were applied to the chemically triggered degradation of a polymer and achieved visual tracking,quantifying,and downcycling of the *** method for designing and developing series fluorophores and visually tracking polymer degradation represents a new photoluminescent platform,allowing its further applications.

关键词： cyclization-induced emission downcycling photoluminescence polymer degradation substituent effect

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A GENERAL APPROACH TO DETERMINING THE EVOLUTION OF MOLECULAR WEIGHT DISTRIBUTION CURVES OF LINEAR polymerS UNDERGOING CHAIN SCISSION

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Chinese Journal of polymer Science 2013年第7期31卷 1056-1060页

作者： Zhuo-li Lin Jun Luo Zheng-jian Chen Ke-hua Tu 王利群王衍伟 MOE Key Laboratory of Macromolecular Synthesis and Functionalization Department of Polymer Science and EngineeringZhejiang University Department of polymer Science and Engineering College of ChemistryChemical Engineering and Materials ScienceSoochow University

A numerical method is developed to compute the development of molecular weight distribution （MWD） curves of linear polymers undergoing chain scission. The method can be applied to complex chain scission kinetics and for arbitrarily complex initial MWD curves. Our method is based on the method of lines （MoL）. Different from the existing numerical scheme, we propose the use of logarithmically spaced points. This development ensures the accuracy of the computed MWD curves at low molecular weights, and it does not require a very fine discretization to produce an accurate result.

关键词： polymer degradation Reaction kinetics Molecular weight distribution Modeling.

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Recycling and Upgrading Utilization of polymer Plastics

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Chinese Journal of Chemistry 2023年第4期41卷 469-480页

作者： Huilin Hu Yana Chen Feng You Junlong Yao Huan Yang Xueliang Jiang Bao Yu Xia Hubei Key Laboratory of Plasma Chemistry and Advanced Materials School of Materials Science and EngineeringKey Laboratory of Green Chemical Engineering Process of Ministry of EducationWuhan Institute of TechnologyNo.206 Guanggu 1st RoadWuhanHubei430205 China Key Laboratory of Material Chemistry for Energy Conversion and Storage(Ministry of Education) Hubei Key Laboratory of Material Chemistry and Service FailureWuhan National Laboratory for OptoelectronicsSchool of Chemistry and Chemical EngineeringHuazhong University of Science and Technology(HUST)1037 Luoyu RdWuhanHubei430074 China

Due to the current situation of massive waste consumption and accumulation,the recycling and upgrading utilization of polymer materials is an effective technology to solve environmental *** this work,the recycling and upgrading methods of polymers are summarized,and the latest progress in polymer upcycling is discussed from the perspective of upgrading *** common polymer recovery methods,including mechanical recovery,chemical recovery,biocatalysis,and photocatalytic recovery,are discussed based on their mechanism and industrialized *** upgrading products of polymers are divided into monomers,fuels and fine *** challenges and prospects of polymer degradation technology are discussed.

关键词： polymer plastics Recycling polymer upgrading Hydrogenation Catalyst Fuel polymer degradation

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Physical and degradation properties of PLGA scaffolds fabricated by salt fusion technique

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The Journal of Biomedical Research 2013年第4期27卷 318-325页

作者： Naveen Kumar Mekala Rama Raju Baadhe Sreenivasa Rao Parcha Prameela Devi Yalavarthy Department of Biotechnology National Institute of Technology Department of Zoology Kakatiya University

Tissue engineering scaffolds require a controlled pore size and interconnected pore structures to support the host tissue growth. In the present study, three dimensional （3D） hybrid scaffolds of poly lactic acid （PLA） and poly glycolic acid （PGA） were fabricated using solvent casting/particulate leaching. In this case, partially fused NaCl particles were used as porogen （200-300μ） to improve the overall porosity （≥90%） and internal texture of scaffolds. Differential scanning calorimeter （DSC） analysis of these porous scaffolds revealed a gradual reduction in glass transition temperature （Tg）（from 48°C to 42.5°C） with increase in hydrophilic PGA content. The potential applications of these scaffolds as implants were further tested for their biocompatibility and biodegradability in four simulated body fluid （SBF） types in vitro. Whereas, simulated body fluid （SBF） Type1 with the optimal amount of HCO 3 ions was found to be more appropriate and sensible for testing the bioactivity of scaffolds. Among three combinations of polymer scaffolds, sample B with a ratio of 75：25 of PLA： PGA showed greater stability in body fluids （pH 7.2） with an optimum degradation rate （9% to 12% approx）. X-ray diffractogram also confirmed a thin layer of hydroxyapatite deposition over sample B with all SBF types in vitro.

关键词： poly (lactic-co-glycolic acid) scaffolds simulated body fluid solvent immersion polymer degradation hydroxyapatite

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Depolymerization of Polyethylene Terephthalate in Supercritical Methanol

Depolymerization of Polyethylene Terephthalate in Supercriti...

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18th International Conference on High Pressure Science and Technology

作者： Motonobu Goto Hiroshi Koyamoto Akio Kodama Tsutomu Hirose Shoji Nagaoka Department of Applied Chemistry and Biochemistry Kumamoto UniversityKumamoto 860-8555 Japan Department of Applied Chemistry and Biochemistry Kumamoto UniversityKumamoto 860-8555 Japan Department of Applied Chemistry and Biochemistry Kumamoto UniversityKumamoto 860-8555 Japan Department of Applied Chemistry and Biochemistry Kumamoto UniversityKumamoto 860-8555 Japan Kumamoto Industrial Research Institute Kumamoto 862-0901 Japan

＜正＞ IntroductionPlastics are decomposed in supercritical fluids quicklyby solvolysis （e.g.,hydrolysis,alcoholysis） or *** polymers having ether linkage,ester linkage,sad acid amide linkage are easily decomposed to itsmonomers by solvolysis in supertritical water orsupercritical *** in supercritical water[1,2]or methanolysis in supercritical methanol [3-5]hasbeen studied for PET *** this wofk,weinvestigated the depolymerization of PET to its monomersin supercritical *** evolution of molecularweight distribution of polymer and oligomer was *** of the monomers and by-products producedin the reaction were measured as a function of reactiontime.

关键词： Supercritical methanol polymer degradation PET

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