检索结果-南通市图书馆

Journal of Materials Science & Technology 2024年第3期170卷 246-254页

作者： Ze Pu Wang WenHong Ruan MinZhi Rong MingQiu Zhang Key Laboratory for Polymeric Composite and Functional Materials of MOE GD HPPC LabIGCMESchool of ChemistrySun Yat-Sen UniversityGuangzhou 510275China

To tackle the challenge of producing highly filled polymer composites using the traditional injection molding technique,which is characterized by the fairly high melt viscosity that makes mold filling difficult,the authors propose a solution based on dynamic covalent *** demonstrated by the proof-of-concept experiments,the 4-arm starshaped polycaprolactone(PCL)oligomers and microcrystalline cel-lulose(MCC)are crosslinked by the reversible Diels-Alder(DA)*** flowability of the compounds greatly decreases due to the dissociation of the intercomponent DA bonds at the retro-reaction tempera-ture,and the networked architecture is reconstructed during cooling as a result of the forward DA ***,the high-loading MCC fillers are well distributed in the matrix and covalently bonded to the nearby PCL,forming a striking contrast to the control in which linear PCL acts as the *** DA bonds crosslinked biodegradable PCL composites exhibit decent mechanical strength(20.7 MPa)even at the MCC fraction of 65 wt%,which is superior to those(5-12.2 MPa)of the highly filled PCL composites(with filler contents of 50-63.8 wt%)reported so *** proposed approach has sufficient expansibility for the fabrication of the highly filled polymer composites constructed by other types of matrix and fillers.

关键词： Polymer composites microcrystalline cellulose Polycaprolactone Injection molding Dynamic reversible chemistry

Characterization and Selection of microcrystalline cellulose from Oil Palm Empty Fruit Bunches for Strengthening Hydrogel Films

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Journal of Renewable Materials 2024年第3期12卷 513-537页

作者： Susi Susi Makhmudun Ainuri Wagiman Wagiman Mohammad Affan Fajar Falah Department of Agroindustrial Technology Faculty of AgricultureUniversitas Lambung MangkuratJl A Yani Km 36BanjarbaruSouth Kalimantan70714Indonesia Doctoral Programme of Agroindustrial Technology Faculty of Agricultural TechnologyUniversitas Gadjah MadaJl Flora No.1BulaksumurYogyakarta55281Indonesia Department of Agroindustrial Technology Faculty of Agricultural TechnologyUniversitas Gadjah MadaJl Flora No.1BulaksumurYogyakarta55281Indonesia

microcrystalline cellulose(MCC)is one of the cellulose derivatives produced as a result of the depolymerization of a part of cellulose to achieve high *** implemented in other polymers,high crystallinity correlates with greater strength and stiffnes,but it can reduce the water-holding *** acid concentration and hydrolysis time will affect the acquisition of crystallinity and water absorption capacity,both of which have significance as properties of hydrogel *** study aimed to evaluate the properties and select the MCC generated from varying the proportion of hydrochloric acid(HCl)and the appropriate hydrolysis time as a filler for film *** was produced by hydrolyzing cellulose of oil palm empty fruit bunches(OPEFB)with the HCl solution at varied concentrations and *** results show that the longer hydrolysis times and higher HCl concentrations increase crystallinity and density while lowering yield and water *** extensive acid hydrolysis reduces the amorphous area significantly,allowing the depolymerization to occur and extend the crystalline *** morphological properties of the MCC,which are smaller but compact,indicate the presence of disintegrating and diminishing structures.A 2.5 N HCl concentration and a 45-min hydrolysis time succeed in sufficient crystallinity as well as maintaining good water absorption *** treatment produced MCC with absorption capacity of 4.03±0.26 g/g,swelling capacity of 5.03±0.26 g/g,loss on drying of 1.44%±0.36,bulk and tapped density of 0.27±0.031 g/cm^(3) and 0.3±0.006 g/cm^(3),respectively,with a crystallinity index of 88.89%±4.76 and a crystallite size of 4.23±0.70 *** MCC generated could potentially be utilized as a hydrogel film filler,since a given proportion will be able to maintain the strength of the hydrogel,not readily dissolve but absorb water significantly.

关键词： Acid hydrolysis hydrogel OPEFB microcrystalline cellulose water absorption

Effect of various aromatic compounds with different functional groups on enzymatic hydrolysis of microcrystalline cellulose and alkaline pretreated wheat straw

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Journal of Bioresources and Bioproducts 2024年第2期9卷 211-221页

作者： Yufeng Yuan Xinyu Guo Bo Jiang Wenjuan Wu Tingwei Zhang Michael Sweeney Mehraj Ahmad Yongcan Jin Jiangsu Co-Innovation Center of Efficient Processing and Utilization of Forest Resources International Innovation Center for Forest Chemicals and MaterialsJiangsu Provincial Key Lab of Pulp and Paper Science and TechnologyNanjing Forestry UniversityNanjing 210037China School of Chemistry and Chemical Engineering Queen’s University BelfastBelfast BT71NNNorthern Ireland United Kingdom Department of Food Science and Engineering College of Light Industry and Food EngineeringNanjing Forestry UniversityNanjing 210037China

Low molecular aromatic compounds are detrimental to the enzymatic hydrolysis of ***,the specific role of their functional groups remains ***,a series of nine aromatic compounds as additives were tested to understand their effect on the hydrolysis yield of microcrystalline cellulose(MCC)and alkaline pretreated wheat *** on the results,the inhibition of aldehyde groups on MCC was greater than that of carboxyl groups,whereas for the alkaline pretreated wheat straw case,the inhibitory effect of aldehyde groups was lower than that of carboxyl *** methoxyl groups of aromatic compounds reduced the inhibitory ef-fect on enzymatic hydrolysis of both *** inhibition of aromatic compounds on MCC hydrolysis was detected in comparison with the alkaline pretreated wheat straw,indicating that the substrate lignin can offset the inhibition to a certain *** all aromatic com-pounds,syringaldehyde with one aldehyde group and two methoxyl groups improved the glucan conversion of the alkaline pretreated wheat straw.

关键词： Aromatic compound Functional group Enzymatic hydrolysis Alkaline pretreated wheat straw microcrystalline cellulose

“One stone,two birds”solvent system to fabricate microcrystalline cellulose–Ti_(3)C_(2)T_(x)nanocomposite film as a flexible dielectric and thermally conductive material

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Nano Research 2023年第2期16卷 3240-3253页

作者： Yong-Zhu Yan Shuwei Li Sung Soo Park Wei-Jin Zhang Jun Seok Lee Jung Rae Kim Dong Gi Seong Chang-Sik Ha Department of Polymer Science and Engineering School of Chemical EngineeringPusan National UniversityBusan 46241Republic of Korea School of Chemical and Biomolecular Engineering Pusan National UniversityBusan 46241Republic of Korea Division of Advanced Materials Engineering Dong-Eui UniversityBusan 47340Republic of Korea

A strategy for fabricating microcrystalline cellulose–Ti_(3)C_(2)T_(x)(MCC–MXene)nanocomposite films with high relative permittivity,high thermal conductivity,and excellent mechanical properties was *** MCC–MXene nanocomposite film was fabricated by casting a solution containing N,N-dimethylacetamide/lithium chloride(DMAc/LiCl)-soluble MCC and DMAcdispersible MXene nanosheets,followed by humidity control *** MXene nanosheets greatly enhanced the permittivity of the nanocomposite films owing to interfacial ***,the nanocomposite film with 20 wt.%MXene content achieved a desirable permittivity of 71.4 at 102 Hz(a 770%improvement against that of neat cellulose),while the dielectric loss only increased by 1.8 times(from 0.39 to 0.70).The obtained nanocomposite films with 20 wt.%and 30 wt.%MXene exhibited remarkable in-plane thermal conductivities of 8.523 and 9.668 W∙m^(−1)∙K^(−1),respectively,owing to the uniform dispersion and selfalignment of the MXene layered ***,the uniformly dispersed MXene nanosheets in the MCC network with interfacial interaction(hydrogen bonding)and mechanical entanglement endowed the nanocomposite films with excellent mechanical properties and ***,the thermal stability,water resistance,and antibacterial properties of the nanocomposite films were effectively improved with the introduction of ***,using DMAc/LiCl as the solvent system not only improves the compatibility between MCC and MXene but also avoids the problem of easy oxidation of MXene in aqueous *** the high stability of the MCC–MXene solution and enhanced properties of the MCC–MXene films,the proposed strategy manifests great potential for fabricating natural biomass-based dielectric materials.

关键词： Ti_(3)C_(2)T_(x) microcrystalline cellulose flexible dielectric thermally conductive N,N-dimethylacetamide/lithium chloride(DMAc/LiCl) compatibility

Kevlar fabric reinforced polybenzoxazine composites filled with silane treated microcrystalline cellulose in the interlayers:The next generation of multi-layered armor panels

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Defence Technology（防务技术） 2022年第11期18卷 2000-2007页

作者： Wissam Bessa Djalal Trache Mehdi Derradji Ahmed Fouzi Tarchoun Energetic Materials Laboratory Ecole Militaire PolytechniqueBP 17Bordj El-Bahri16046AlgiersAlgeria Process Engineering Laboratory Ecole Militaire PolytechniqueBP 17Bordj El-Bahri16046AlgiersAlgeria Energetic Propulsion Laboratory Ecole Militaire PolytechniqueBP 17Bordj El-Bahri16046AlgiersAlgeria

The design of astonishing combinations of benzoxazine resins with various fillers is nowadays of great interest for high quality products,especially in ballistic *** objective of this study is to investigate a new hybrid material prepared as multi-layered composite plate by hand lay-up *** composites were manufactured from Kevlar fabrics reinforced polybenzoxazine,which was filled with silane treated microcrystalline cellulose(MCC Si)at various amounts in the *** developed materials were tested for their flexural,dynamic mechanical and ballistic *** aim was to highlight the effect of adding different amounts of MCC Si on the behavior of the different *** to the baseline,the dynamic mechanical and bending tests revealed an obvious decrease of the glass transition of 21℃and a notable increase in storage modulus and flexural strength of about 180%and17%,respectively,upon adding 1%MMC Si as ***,the ballistic test exhibited an enhancement in kinetic energy absorption for which the composite supplemented with 1%MCC Si had the maximal energy absorption of 166.60 *** results indicated that the developed panels,with interesting mechanical and ballistic features,are suitable to be employed as raw materials to produce body armor.

关键词： Polybenzoxazine microcrystalline cellulose Kevlar fabric Mechanical properties Ballistic energy absorption

Synthesis of microcrystalline cellulose—Polyvinyl Alcohol Stabilized Polyvinyl Acetate Emulsion

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Green and Sustainable Chemistry 2023年第1期13卷 23-33页

作者： Ravindra V. Gadhave S. K. Vineeth Department of Polymer and Surface Engineering Institute of Chemical Technology Mumbai India

Polyvinyl alcohol (PVA) colloid stabilized Polyvinyl acetate (PVAc) based wood adhesive has poor performance in highly humid conditions. Currently, the addition of natural fillers in the wood adhesive is one of the most effective ways to enhance the performance of PVAc wood adhesive in highly moist conditions. microcrystalline cellulose (MCC) are strong renewable, bio-based material and has great potential in a reinforcement of the polymeric matrix. Hence, the present work investigates the applicability of microcrystalline cellulose incorporated 3% and 5% in situ emulsion polymerization PVAc wood adhesives. Effect on physical, thermal and mechanical properties was studied by viscosity, pH, contact angle measurement, differential scanning calorimetry (DSC) and pencil hardness test of films. Emulsions with different proportions of MCC were prepared and the shear strength of the applied adhesive on wood was measured. The viscosity of the adhesives was increased by increasing the concentration of MCC. The mechanical properties like tensile strength of adhesives with MCC were measured by universal tensile machine (UTM). Thermal stability was studied by differential scanning calorimetry (DSC). The tensile shear strength demonstrates that MCC can improve bonding strength as compared to PVAc Homo based adhesive in the wet condition which was validated through a contact angle study. The hardness of PVAc films were also changed positively by the addition of MCC. Here, we studied the effect of the addition of different concentrations of MCC materials in situ polymerization of PVAc on their performance properties.

关键词： Wood Adhesive Polyvinyl Acetate microcrystalline cellulose Bio-Based Emulsion

Rapid and Efficient Adsorption Removal of Reactive Blue 4 from Aqueous Solution by Cross-Linked microcrystalline cellulose–Epichlorohydrin Polymers: Isothermal, Kinetic, and Thermodynamic Study

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Transactions of Tianjin University 2021年第1期27卷 77-86页

作者： Yuanyuan Zhai Hongmei Qu Zhongxuan Li Bo Zhang Jinxi Cheng Jiaji Zhang Key Laboratory of Systems Bioengineering Ministry of EducationSchool of Chemical Engineering and TechnologyTianjin UniversityTianjin 300350China

In this study, we modified microcrystalline cellulose by cross-linking it with epichlorohydrin to obtain a rapid and efficient adsorbent for the removal of Reactive Blue 4 dye from aqueous solution. Evidences of the cross-linking of the microcrystalline cellulose were obtained by Fourier transform infrared spectroscopy, X-ray diff raction, Brunauer–Emmett–Teller analysis, thermogravimetric analysis, and scanning electron microscopy. We investigated the eff ects of adsorbent dosage, p H, initial dye concentration, temperature, and contact time on the dye adsorption capacity. The results showed that the adsorption equilibrium time was just 20 min and the maximum adsorption capacity was 69.79 mg/g. The adsorption isotherm data fitted the Langmuir isotherm model well, and the adsorption kinetics data followed the pseudo-second-order kinetic model. The results of the thermodynamic analysis suggest that the adsorption process was spontaneous and exothermic. Recyclability experiments demonstrated the good reusability of this adsorbent. Electrostatic interaction was found to dominate the adsorption process.

关键词： microcrystalline cellulose Cross-linking Epichlorohydrin Adsorption Reactive Blue 4 Wastewater

Investigation of Agave cantala-based composite fibers as prosthetic socket materials accounting for a variety of alkali and microcrystalline cellulose treatments

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Theoretical & Applied Mechanics Letters 2020年第6期10卷 405-411页

作者： Sakuri Sakuri Eko Surojo Dody Ariawan Aditya Rio Prabowo Department of Mechanical Engineering STT Wiworotomo PurwokertoBanyumas 53134Indonesia Department of Mechanical Engineering Universitas Sebelas MaretSurakarta 57126Indonesia

This study was aimed to determine the mechanical strength of composites made from Agave cantala with an unsaturated polyester matrix and microcrystalline *** fiber(CF)was treated with 6%Na OH with immersion times of 0 h(UF),3 h(AK3),6 h(AK6),9 h(AK9),and12 h(AK12).Thermogravimetric analysis(TGA)analysis shows that treated CF has higher thermal stability than CF without *** fiber was tested by X-ray *** alkali treatment with a 6-h soaking,it had a crystallinity index of 73.65%.Scanning electron microscopy(SEM)showed that the fibers were cleaner after alkali treatment because hemicellulose,wax,and other impurities were *** of the contact angle and surface energy showed that treated CF has smaller contact angles and greater surface energy.

关键词： Cantala fiber microcrystalline cellulose Prosthetic socket Tensile and flexural characteristics

Preparation of highly stable diclofenac potassium pellet with microcrystalline cellulose by extrusionespheronization

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Asian Journal of Pharmaceutical Sciences 2013年第6期8卷 356-361页

作者： Yueqi Wang Hao Huang Chungang Zhang Yilin Tang Jinzhuo Li Xing Tang Cuifang Cai Shenyang Pharmaceutical University No.103Wenhua RoadShenyang 110016China School of Materials Science and Engineering Xi’an Jiaotong UniversityXi’an 710049China Department of Pharmaceutics College of PharmacyJilin UniversityChangchun 130021China

The main purpose of this study is to prepare highly stable diclofenac potassium(DP)pellet with microcrystalline cellulose(MCC)by *** MCC,DP pellets were prepared and the stability was *** compounds of DP pellets were analyzed by High Pressure Liquid Chromatography(HPLC).After stability test of 60℃/75%RH for 10 d,the values of two main related compounds were 0.94%and 2.17%,*** tests show that instability of DP was mainly caused by *** improve the stability of DP in presence of MCC,different kinds of stabilizers were *** addition of 1.5%(w/w)sodium hydroxide,the primary related compound of pellets was reduced to be 0.159%after stability test of 60℃/75%RH for 50 *** study demonstrated that MCC induced decomposition of DP upon exposure to moisture could be prohibited by addition of sodium *** mechanisms were discussed and residual hydroxyl free radicals in excipients were responsible for decomposition of ***,this formulation of DP is highly stable with sustained-release behavior.

关键词： Compatibility microcrystalline cellulose Diclofenac potassium Pellets Stability

Obtaining and Characterization of Biodegradable Composites Reinforced with microcrystalline cellulose Fillers

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Materials Sciences and Applications 2021年第12期12卷 561-577页

作者： Lucas Viana Costa Gisele C. Valle Iulianelli Paulo Sérgio Rangel C. da Silva Fernanda A. dos Santos Instituto de Macromoléculas Professora Eloisa Mano Universidade Federal do Rio de Janeiro Rio de Janeiro Brazil

In recent years, there has been a growing discussion about the problems related to the massive use of many synthetic plastic materials, which inevitably leads to an increase in environmental pollution caused by the inappropriate disposal of these materials. In this sense, biodegradable materials have been a subject of great interest, as they are a real alternative to replace these materials and tackle this issue. In this work, fully biodegradable composites were prepared by solution casting method. microcrystalline cellulose (MCC) and treated microcrystalline cellulose (TMCC) were separately incorporated into biodegradable PLA and PHB matrices at ratios of 3, 5 and 7 wt% and the properties of the obtained biocomposites were evaluated by TGA, DSC, XRD and TD-NMR. From thermal analyses, it was seen that TMCC resulted in better thermal stability and 3 wt% of filler, in general, promoted a more pronounced thermal improvement. Furthermore Tg, Tc and Tm remained practically unchanged after MCC and TMCC addition. From XRD it was seen that the cellulose fillers influence in different ways the matrices, promoting increase or decrease in the degree of crystallinity. Finally, the results obtained by TD-NMR showed a decrease in the T1H values for all prepared biocomposites, indicating a good dispersion of the cellulose fillers in the matrices and pointed that the systems containing 3 wt% of cellulose fillers were the most homogeneous formulations.

关键词： PHB PLA microcrystalline cellulose Biocomposites TGA DSC XRD TD-NMR