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为考察离子液体对淀粉/聚丁二酸丁二醇酯(PBS)的作用效果,降低淀粉/PBS的脆性,以离子液体(1-丁基-3-甲基咪唑氯盐[BMIM]Cl)作为增塑改性剂通过熔融共混法制备了玉米淀粉/聚丁二酸丁二醇酯(PBS)共混材料,采用红外光谱(FTIR)、扫描电镜(SEM)、热重分析(TGA)、X射线衍射分析(XRD)及力学性能测试方法研究了[BMIM]Cl对淀粉/PBS共混材料结构和性能的影响.结果表明,[BMIM]Cl能与淀粉/PBS分子发生强相互作用,破坏淀粉/PBS共混物中原有的氢键与结晶结构,增强界面相互作用,改善相容性,进而改变淀粉/PBS共混材料的结构与性能;[BMIM]Cl的加入不影响淀粉/PBS的热稳定性,可使材料玻璃化转变温度(Tg)、结晶温度(Tc)、冷结晶温度(Tcc)及结晶度(Xc)降低.[BMIM]Cl具有显著降低淀粉/PBS脆性的作用,使其断裂伸长率大幅度增加,拉伸强度和弹性模量降低. 相似文献
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Xiao-Jing Li Ying-Feng Wen Yong Wang Hai-Yan Peng Xing-Ping Zhou Xiao-Lin Xie 《高分子科学》2022,40(1):47-55
Supramolecular adhesives that enable debonding on-demand are of significant research interest for the development of adaptive and smart materials,yet,biodegrable supramolecular adhesives have been rarely exploited.Herein,telechelic,three-armed and four-armed CO2-based polyols with close molecular weights and various content(or carbonate unite content)have been synthesized via a zinc-cobalt double metal cyanide complex catalyzed ring-opening copolymerization of CO2 and propylene oxide,and further exploited as sustainable and biodegradable building blocks for supramolecular polymers(SMPs)with 2-ureido-4[1H]-pyrimidinone(UPy)motifs.Notably,the orthogonal modulation of the CO2 content and the topology of CO2-based polyols provide a unique opportunity to fine-tune the surface energy as well as the cohesive strength of the resulting CO2-based SMPs.Notably,a three-armed SMP with 44%CO2(3UPy-CO2-44%)can well balance the trade-off between surface energy and cohesive strength,therefore bestowing a high adhesive strength of 7.5 and 9.7 MPa towards stainless steel and wood substrates respectively by testing the corresponding single lap joints.Moreover,the light-responsive adhesion property of 3UPy-CO2-44%has been demonstrated exemplarily by blending with a UV sensitizer. 相似文献
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淀粉和生物降解大分子间的半互穿聚合物网络的耐水性研究 总被引:2,自引:0,他引:2
以淀粉和可生物降解的PCL或PHBV等疏水性脂肪族聚酯为原料, 制备了淀粉基的Semi-IPN材料. 加入PCL或PHBV等疏水性大分子的使淀粉基Semi-IPN材料的耐水性能相对于原淀粉有很大的改善, 通过热处理和溶剂化作用能使Semi-IPN的耐水性进一步提高. 相似文献
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医用可生物降解高分子材料 总被引:7,自引:0,他引:7
对目前医用可生物降解高分子材料的研究及应用状况分化学合成,天然和生物技术合成三类作了综述。对材料的生物相容性、可生物降解性及物理机械性能进行了分析和比较。并就医用生物降解高分子材料的发展趋势作了预测。 相似文献
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Blends of Poly(lactic acid) with Thermoplastic Acetylated Starch 总被引:1,自引:0,他引:1
Blends of poly(lactic acid)(PLA) and thermoplastic acetylated starch(ATPS) were prepared by means of the melt mixing method. The results show that PLA and ATPS were partially miscible, which was confirmed with the measurement of Tg by dynamic mechanical analysis(DMA) and differrential scanning calorimetry(DSC). The mechanical and thermal properties of the blends were improved. With increasing the ATPS content, the elongation at break and impact strength were increased. The elongation at break increased from... 相似文献
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The public and governmental awareness regarding more sustainable products have gained significant momentum in the last decade and are directing the future research of the next generation of materials and processes. In such a setting, biodegradable polymers are regarded as one of the technologies driving the innovation and current market growth because they provide an additional end of life option. Tracing the evolving trends of these emerging technologies will help researchers, investors, and policy makers to better evaluate the opportunities of the technology as well as to understand the technology's changing characteristics. Therefore, within this study, we perform bibliographic analyses based on patent information to delineate the current research landscape and to anticipate the future development trends by focusing on the cases of poly(lactic acid) (PLA), poly(hydroxyalkanoates) (PHAs), polycaprolactone (PCL), poly(butylene succinate) (PBS), and poly(butylene adipate-co-terephthalate) (PBAT). The following findings were made: First, PLA gets the highest attention from both academia and industry. Second, the overall international presence of biodegradable polymer patents is high, especially in the field of PHAs. Third, technology maturity and technology strength show that PLA is the most promising technology at present in technological terms, whereas PHAs, PCL, and PBS are uncertain technologies and PBAT has a rather low development potential. 相似文献
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可生物降解聚酯酰胺共聚物的合成与表征 总被引:8,自引:0,他引:8
以两种合成的酰胺二元醇和癸二酸为原料合成了可生物降解的聚酯酰胺共聚物,研究了该癸半晶性聚合物的合成、结晶及其生物降解性,并应用IR,^1H NMR,SEM及DSC进行了表征。 相似文献
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WANGShen-guo WANYu-qing CAIQing HEBin CHENWen-na 《高等学校化学研究》2004,20(2):191-194
Poly(lactic acid) and its copolymers are regarded as the most useful biomaterials. The good biocompatibility, biodegradability and mechanical properties of them make the synthetic biodegradable polymers have primary application to tissue engineering. The advantages and disadvantages of the synthetic biodegradable polymers as cell scaffold materials are evaluated, This article reviews the modification of polylactide-family aliphatic polymers to improve the cell affinity when the polymers are used as cell scaffolds. We have developed four main approaches: to modify polyester cell scaffolds in combination of plasma treating and collagencoating; to introduce hydrophilic segments into aliphatic polyester backbones; to introduce pendant functional groups into polyester chains ; to modify polyester with dextran. The results of the cell cultures prove that the approaches mentioned above have improved the cell affinity of the polyesters and have modulated cell function such as adhesion, proliferation and migration. 相似文献
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<正>Biodegradable aliphatic/aromatic copolyesters,poly(butylene terephthalate-co-lactate)(PBTL) were prepared via direct melt polycondensation of terephthalic acid(TPA),1,4-butanediol(BDO) and poly(L-lactic acid) oligomer(OLLA). The effects of polymerization time and temperature,as well as aliphatic/aromatic moiety ratio on the physical and thermal properties were investigated.The largest molecular weight of the copolyesters was up to 64100 with molecular weight distribution index of 2.09 when the polycondensation was carried out at 230℃for 6 h.DSC,XRD,DMA and TGA analysis clearly indicated that the degree of crystallinity,glass-transition temperature,melting point,decomposition temperature, tensile strength,elongation and Young's modulus were influenced by the ratio between TPA and OLLA in the final copolyesters.Hydrolytic degradation results demonstrated that the incorporation of biodegradable lactate moieties into the aromatic polyester could efficiently improve hydrolytic degradability of the copolymer even though it still had many aromatic units in the main chains. 相似文献
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CPVC/SMA共混体的流变性能 总被引:1,自引:0,他引:1
CPVC有许多优良的物理和力学性能,但是它的热分解温度和熔融温度相距太近,加工性能很不好,Krishnan等人最先研究了CPVC的流变性能,我们近几年研究了其共混体的流变性,发现通过共混方法可以有效地改善CPVC的加工特性.CPVC与苯乙烯-马来酸酐共聚物(SMA)共混体的流变性的研究则未见报道.本文研究了CPVC/SMA共混体的流变特性,为CPVC材料加工工艺参数的制定提供了依据. 相似文献
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淀粉与木糖醇共混物的性能 总被引:10,自引:0,他引:10
淀粉与木糖醇共混物的性能于九皋,郑华武(天津大学化学系天津300072)关键词淀粉,木糖醇,共混,热塑性研究具有环境条件下可降解的塑料已成为国内外专家学者广泛关注的研究课题。淀粉具有类似高聚物的分子结构,但由于分子量大,分子之间的亲合力强,很难加工成... 相似文献
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生物降解聚合物的研究和产业化进展及展望 总被引:3,自引:0,他引:3
结合作者等近十年来在生物降解聚合物领域的研究和产业化工作,本文概述了聚乳酸、聚氨基酸、聚对二氧六环酮及其它生物降解聚合物的合成进展,综述了可生物降解温度敏感水凝胶、形状记忆高分子材料的研究概况,阐述了可生物降解聚合物在生物活性大分子控释体系、超细纤维组织工程支架上的应用研究,介绍了可生物降解聚合物在食品包装、纺织和汽车电子等方面的应用,总结了可生物降解聚合物、医疗器械、药物制剂和组织工程等领域产业化近况.最后展望了生物降解聚合物的研究、应用和产业化前景. 相似文献
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Summary: In this study, blends of poly(lactic acid) (PLA) with poly(butylene adipate-co-terephthalate) (PBAT) were studied for their mechanical and thermal properties as a function of the PBAT content. Tensile testing, impact testing, differential scanning calorimetry (DSC), dynamic mechanical analysis (DMTA) and scanning electron microscopy (SEM) were used to characterize the blends. It was observed that PLA/PBAT blends maintained quite high modulus and tensile strength compared to pure PLA. Small amounts of PBAT improved the elongation at break and the impact resistance showing a debonding effect typical of rubber toughened systems. 相似文献