生物降解性高分子材料

本文综述了国内外生物降解高分子材料的研究现状和发展方向，分析了国内外生物降解研究和生产中存在的几个问题，结合我国的国情，对我国未来生物降解高分子的研究和发展提出了几点建议。     

生物降解性高分子材料

简述了生物降解性高分子的生物降解机理,阐述了影响高分子材料生物降解的因素,重点介绍了生物降解 性高分子研究现状。     

生物降解高分子材料

介绍了高分子材料生物降解机理,概述了生物降解材料的研究和应用情况,并展望了将来的研究方向。     

降解性高分子材料的研究与开发现状

论述了光降解、生物降解和光－生物降解高分子材料的类型、性能及应用,总结了存在的问题,并提出了发展方向和建议。     

生物降解高分子材料应用前景看好

塑料材料的大量应用，在给人们的生活带来许多方便的同时，也造成了许多困扰。而从根本上解决这一难题的途径就是生产可降解塑料等。可以预见，在21世纪降解性高分子材料将会取得长足发展，成为高分子工业不可分割的部分。     

生物降解高分子材料

综述了近２０年来国内外生物降解高分子材料的研究进展及试验评价方法，初步探讨了生物降解的机理，并对现存的几个问题及开发前景提出了几点看法。     

生物降解高分子材料研究进展

介绍了生物降解高分子材料的概念和分类,并结合具体实例详细论述了目前国内外在天然、微生物合成、化学合成和掺混型等四类生物降解高分子材料方面的研究方向及最新研究进展。     

生物降解高分子材料

简要介绍生物降解高分子材料的定义、降解机理及影响因素的基础上,较为全面的阐述了当前生物降解高分子材料的应用领域     

生物降解性高分子材料的发展和应用

综述了生物降解性高分子材料的社会需求及其应用领域，重点介绍了几种典型的生物降解性材料，如脂肪族聚酯、纤维素、淀粉系等聚合物的研究和开发现状。对其未来发展作了展望。     

生物降解高分子材料的研究新进展

综述了生物降解高分子材料制备方法和降解机理的研究新进展 ,并讨论了结构、组成、形态和外界条件等因素对均聚物、共聚物和高分子共混物生物可降解性的影响 ,简述了生物降解高分子材料在生物医学、包装和农业领域的潜在应用。     

药物缓释用生物降解性高分子载体材料的研究

生物降解性聚合物安全、可靠,有良好的生物相容性,可通过生理途径代谢排出体外,成为了药物载体的首选材料。本文简要综述了主要常用天然和合成生物降解性聚合物,如壳聚糖、环糊精、胶原、聚乳酸、聚酸酐、氨基酸类聚合物的制备方法,在药物缓释体系的作用和效果,并对其发展趋势进行了展望。     

可降解形状记忆聚合物研究进展

综述了近来可降解热塑性和热固性形状记忆聚合物(γ-射线、紫外光辐射等交联方式)的研究进展。热固性形状记忆聚合物的形状恢复率、形状固定率相对较大,降解速度均一,具有良好的研究及应用前景。     

Preparation and properties of bio‐nanoreinforced composites from biodegradable polymer matrix and cellulose whiskers

Crystalline cellulose was extracted from one of the cheapest source; grass by alkali, acid, and mechanical treatments. To evaluate the reinforcing effect of this filler, biodegradable polymer matrix, polylactic acid (PLA) was used and samples were prepared at different concentrations. The modified whiskers were also used as filler to examine the effect on mechanical properties. Crystallinity, thermal behavior, surface morphology and functional group variation was monitored through, XRD, TGA, SEM, and FTIR respectively. The properties were largely depending on the concentration of filler whereas; modification of hydroxyl groups did not exhibit remarkable change in mechanical properties. Thermal resistance was decreased in comparison of neat matrix and reduction in crystallinity was also observed for composites, regardless of filler nature. It was thought that the hydrophilicity of cellulose could be altered by modifying its hydroxyl groups, thereby promoting dispersion. However, the possibility of phase separation was increased, and the thermal stability of the composites gradually decreased with increasing filler load in the matrix. In the examined systems, it was observed that improvement of reinforcing capacity may not only depend on the chemical compatibility between matrixes but also some compositional and physical parameters may be responsible for variation in properties. © 2009 Wiley Periodicals, Inc. J Appl Polym Sci, 2010     

In vitro release of complexed pDNA from biodegradable polymer films

The controlled delivery of low‐molecular weight drugs and proteins from biodegradable polymers has received considerable attention. However, controlled release studies of pDNA from such polymers have not been reported to date. In this study, a plasmid DNA was complexed with the cationic polymer called polyethylenimine (PEI). This gene vector has been shown to be very effective in transfecting cells. The complexed DNA were then incorporated into different types of poly‐lactic‐co‐glycolic acid (PLGA) film; PLGA 53/47 (M_w 90 kDa), 50/50 (M_w 11 kDa, end group is lauryl ester) and 75/25 (M_w 120 kDa). Their release profiles from a buffer solution were studied. An initial (small) burst release of PEI‐DNA from film was observed in PLGA 53/47 and 50/50, followed by a plateau phase and finally a rapid erosion‐controlled release. For PLGA 50/50, the rapid release started after 14 days; erosion‐controlled release for PLGA 53/47 started after 9 days; for PLGA 75/25, the release rate was governed by an initial burst release (10%) followed by a slow release controlled by diffusion. No obvious erosion‐controlled release rate was observed for this polymer up to 27 days. Thus, the controlled release of complexed DNA follows the general features exhibited by lower‐ M_w drugs. This is of significance in designing gene vector matrices that offer the promise of more lasting gene therapy compared with particulate formulations. © 2008 Wiley Periodicals, Inc. J Appl Polym Sci, 2008     

聚乙二醇改性聚乳酸类材料的合成及应用

介绍了丙交酯与环氧乙烷开环共聚合、丙交酯与聚乙二醇(PEG)开环共聚合，以及在其基础上的扩链3种主要的聚乙二醇改性聚乳酸(PELA)合成方法，并概括了各种PELA合成材料的性能与应用。为了得到功能化和亲水性理想的聚乳酸类生物降解高分子，聚乳酸树脂的PEG改性合成T作越来越引人注目。以PEG、乳酸等为原料，通过简单易行的直接聚合法合成PELA类材料，降低PELA类材料的成本，是未来研究的重要方向。     

淀粉基降解塑料的研究进展

简述了淀粉基塑料的分类及其发展,介绍了国内外在这一领域的最新进展与研究成果,指出了淀粉塑料目前存在的问题以及今后发展方向。     

Dry and durable electro‐active paper actuator based on natural biodegradable polymer

This article describes a dry and durable electro‐active paper (EAPap) actuator based on natural biodegradable polymer: cellulose and chitosan. To fabricate this actuator, cellulose and chitosan were dissolved in trifluoroacetic acid. The solution was cast to form a film followed by depositing thin gold electrode on both sides of the film. The actuator was actuated under AC voltage at an ambient condition by changing the actuation voltage, frequency, and time. The actuator revealed a large bending displacement under low voltage, electrical power consumption at low humidity condition. This cellulose–chitosan blended EAPap actuator is suitable for dry and durable actuator. Details about the fabrication, durability, electrical power consumption, and characteristics as well as morphology of the actuator are explained. © 2009 Wiley Periodicals, Inc. J Appl Polym Sci, 2010     

淀粉基可生物降解纤维的改性方法

淀粉材料由于成本低、易于得到、加工相对容易、可完全降解,因此前景比较广阔。目前,淀粉基可生物降解材料已成为研究热点。笔者概述了淀粉的结构与性能,介绍了几种常见的淀粉纤维改性方法,并叙述了淀粉纤维研究和发展状况,指出开发淀粉基可生物降解纤维材料的现实意义。随着国民经济的发展和人民生活水平的日益提高,改性淀粉的应用会越来越广泛。     

改性淀粉基生物降解塑料的研究进展

利用淀粉制备可生物降解的淀粉基塑料并替代传统的石化产品合成非降解塑料,对改善并解决白色污染问题有重要意义。由于淀粉本身力学性能较差,需要对其进行物理或化学改性,以提高其力学性能。本文综述了常见的改性方法有：热塑性处理,使淀粉转变为热塑性淀粉,以改善淀粉的延展性能和成膜性;将淀粉和高聚物（PVA、PLA、PBAT）共混制备的复合降解塑料,较纯淀粉基塑料成膜性能和力学性能明显改善;将淀粉与增强剂（纤维素、壳聚糖、木质素、石墨烯等）共混,产品的力学性能、阻水性能、热稳定性、透氧性、透明度等性能得以改善,成本降低;在制备淀粉基塑料的过程中添加增塑剂,可干扰淀粉分子间强的相互作用,使其柔韧性增加。淀粉基生物降解塑料作为包装材料在食品、农业、制药等行业具有广泛的应用潜力。