聚乳酸改性研究新进展

本文综述了国内外聚乳酸(PLA)改性研究近年来取得的主要成果,内容涉及PLA改性方法以及PLA改性常用改性剂和相容剂等,并对PLA改性研究方向进行了展望。     

PLA的合成及改性研究进展

介绍了聚乳酸(PLA)的基本性质、合成方法及应用范围。综述了国内外PLA的改性研究及目前有关PLA性能改进的方法。概括了PLA在合成及改性中需要注意的问题,展望了PLA的发展前景:不断改进、简化和缩短PLA的合成工艺;用新材料、新方法对PLA进行改性,开发出新用途、高性能的PLA材料是PLA的研究方向。     

聚乳酸增韧改性最新研究进展

聚乳酸(PLA)是一种新型的生物降解材料,具有较好的力学性能,但是其韧性差,大大限制了其应用,本文对PLA的增韧改性最新研究进展进行了综述,PLA的改性方法主要包括化学改性和物理改性。     

溶液法制备PLA/改性长石复合材料及其性能表征

以KH570为改性剂对哈密长石进行湿法表面改性。以改性长石作为填料,通过溶液法制备了PLA/改性长石复合材料,对其性能及微观结构进行了测试和表征。界面接触角测试表明,经改性后界面接触角明显增大,表面有机憎水,具有亲油性,与FT-IR分析结果相吻合;力学性能测试表明,5%改性长石的加入有助于改善PLA复合材料的拉伸强度;TGA分析表明PLA/改性长石复合材料的热分解温度比PLA基体提高了4.47℃,表明其热稳定性得以提高;DSC分析表明,改性长石可以消除PLA复合材料的冷结晶,有助于提高PLA复合材料的结晶度,与XRD分析相吻合。测试结果表明,改性长石在PLA基质中起到了异相成核的作用,促进了PLA基质的结晶。     

生物降解塑料聚乳酸(PLA)的改性研究进展

近些年来国内外在聚乳酸改性方面的研究进展情况进行了综述,其物理改性方法主要包括增塑剂共混改性、成核剂共混改性、无机填料共混改性以及纤维素共混改性等,化学改性方法主要包括共聚改性、扩链改性、交联改性、接枝改性等。最后就目前PLA存在的缺陷进行总结,并对未来PLA改性的发展方向作出展望。     

环境友好型聚乳酸改性研究进展

介绍了聚乳酸(PLA)的性能特点。从共混改性、填料填充改性、纳米复合改性、纤维增强改性等方面综述了PLA改性研究进展。通过改性,可改善PLA的结晶性、热稳定性、生物相容性、生物可降解性、冲击性等性能。并对PLA的发展方向提出展望,指出随着复合改性技术的发展,PLA将会在医学材料、包装材料、建筑材料、生活用品等领域得到广泛应用。     

透明耐热聚乳酸材料改性研究进展

概述了近年来国内外聚乳酸(PLA)材料的耐热改性方法,包括共混改性、立构改性、无机填充改性。介绍了PLA的透明耐热改性方法,包括链结构改性、与透明高耐热聚合物共混改性、外力场作用下制备透明耐热PLA,在保证透明性的前提下有效提升了PLA材料的耐热性能。重点介绍了生物降解透明耐热PLA的制备方法,如结晶动力学调控、与可降解材料共混改性,并对透明耐热PLA的研究和发展方向作出总结与展望。     

生物降解塑料聚乳酸(PLA)的改性研究进展

近些年来国内外在聚乳酸改性方面的研究进展情况进行了综述,其物理改性方法主要包括增塑剂共混改性、成核剂共混改性、无机填料共混改性以及纤维素共混改性等,化学改性方法主要包括共聚改性、扩链改性、交联改性、接枝改性等。最后就目前PLA存在的缺陷进行总结,并对未来PLA改性的发展方向作出展望。     

植物纤维增强聚乳酸基复合材料研究进展

综述了不同种类聚乳酸(PLA)/植物纤维复合材料的制备工艺,通过物理改性和化学改性的方法对材料进行改性以改善复合材料的强度、界面相容性、表面自由能等,从而提高材料的使用性能,对于PLA/植物纤维复合材料的制备及推广应用具有良好的参考价值。     

生物质基聚乳酸材料改性研究进展

聚乳酸(PLA)具有可再生、可降解、高强度、高模量以及良好的生物相容性等优点。目前,PLA已经逐渐成为传统塑料的替代品,被视为非常有潜力的绿色生物质高分子材料。然而,PLA制品仍然表现出较差的韧性、耐热性、耐水解性和阻燃性能,限制其发展和应用。因此,需要对PLA进行改性以达到生产和使用要求。归纳总结了几种PLA改性方法,包括成核改性、增韧改性、共混改性、退火改性和化学改性法。分析了存在的问题并展望了未来的研究趋势。     

聚乳酸改性研究进展

聚乳酸类材料是一种用途广泛的可生物降解材料,聚乳酸通过改性,其相应的性能会得到很大的改善,其应用领域更加广阔。文章对聚乳酸的改性研究进展进行了综述,聚乳酸的改性方法有物理改性(包括共混改性和增塑改性等)、化学改性(包括共聚改性和交联改性等)和复合改性等。     

聚乳酸材料耐热改性研究进展

介绍了聚乳酸材料的合成方法,综述了共混改性、复合改性、接枝共聚、分子主链中引入耐热结构单元等聚乳酸改性技术,并对聚乳酸的发展前景作了展望。     

新型环保材料——聚乳酸的合成及改性研究进展

聚乳酸是一种优良的可生物降解聚合物,是世界公认的环保、可持续发展材料。对聚乳酸的合成方法进行了综述,包括间接法和直接法。直接法作为一种新兴的方法被广泛采用,又可分为溶液缩聚法、熔融缩聚法等。同时聚乳酸通过改性,其相应的性能会得到很大的改善,其应用领域会更加广阔。对聚乳酸的改性研究进展进行了介绍,其改性方法有物理改性、化学改性和复合改性等。物理改性又分为共混改性和增塑改性等;化学改性可分为共聚改性和交联改性等;复合改性包括与各种纤维复合改性和与无机纳米材料复合改性等。     

聚乳酸的改性研究进展

介绍了近年来聚乳酸改性方面的研究进展;通过共聚、共混、复合、辐射、接枝等方法提高聚乳酸使用性能;并对未来聚乳酸的发展进行了展望。     

High-performance poly(lactic acid)/starch materials prepared via starch surface modification and its in situ enhancement

High-performance modified poly(lactic acid) (PLA)/starch (ST) blends were prepared by incorporating silane coupling agent. The coupling agent acted as a bridge between PLA and ST components, enhancing their interfacial compatibility during the melt blending. The addition of epoxy-functionalized silane coupling agent improved the interfacial adhesion between PLA and ST phases, as evidenced by the decreased number and spacing of gaps between the ST particles and PLA matrix. The coupling agent also filled the surface crack of the ST particles, improving their dispersion in PLA matrix. The tensile strength of the modified PLA/ST blend increased from 19.6 MPa for the neat PLA/ST blend to 53.4 MPa, exceeding that of neat PLA. The modified blend also showed improved hydrophobicity and thermal stability. This research presented an effective approach to reducing the cost of PLA-based materials and improving the performance of ST-filled PLA materials by enhancing the interfacial adhesion between ST and PLA through surface modification with silane coupling agent. It provided a simple and feasible strategy for the high-performance modification of polyester/ST materials.     

Surface modification and degradation of poly(lactic acid) films by Ar-plasma

Surface modification of poly(lactic acid) (PLA) film surface by Ar-plasma was investigated by contact angle measurements and XPS in order to answer the following two questions. (1) Could the Ar-plasma modify the PLA film surfaces? (2) What chemical reactions occurred on the film surfaces during the Ar-plasma treatment? The Ar-plasma treatment did not lead to hydrophilic modification of the PLA film surface, but to degradation reactions of the PLA film. Poor modification may be due to instability of the carbon radicals formed from C—O bond scission in the PLA chains by the Ar-plasma.     

Enhancing the durability of poly(lactic acid) composites by nucleated modification

Biodegradable poly(lactic acid) (PLA) composites were prepared using an innovative combination of wood fiber (WF) and 1,3,2,4‐bis(3,4‐dimethylobenzylideno)sorbitol (DMDBS). DMDBS acted as an effective nucleating agent, which improved the mechanical properties and slowed down the degradation of the WF/PLA composites. The enzymatic degradation of the composites was examined by immersing in proteinase K or cellulase buffer. The presence of DMDBS resulted in a 26.7% increase of the crystallinity compared to the WF/PLA composites. The increase in crystallinity enhanced the thermal stability and tensile strength of the WF/DMDBS/PLA composites by 8.5%. The durability of the WF/DMDBS/PLA composites after nucleated modification was enhanced after enzymolysis. After nucleated modification, the surface of the WF/PLA composites showed clear cracks due to degradation, while these appeared about 2 weeks later in the case of the WF/DMDBS/PLA composites. The results revealed that the introduction of cellulase degraded WF in the composites, which increased hydrolysis or enzymolysis sites. The combination of nucleated modification and enzyme buffer gave an expanded downstream application of WF/PLA composites in packaging and agricultural materials. © 2019 Society of Chemical Industry     

生物降解材料聚乳酸的改性

为降低聚乳酸(PLA)的成本、改善其亲水性、提高其力学性能和加工性能以及利用PLA改性其他高分子,可使用基体扩链、表面改性、接枝、增塑、共混、复合等技术对PLA类生物降解材料进行改性。乳酸直接共聚合改性、合成PLA类材料以及从廉价天然资源出发追求PLA改性的工业化是未来主要发展方向。     

医疗卫生用聚乳酸非织造材料的制备及其亲水改性研究进展

简述了静电纺丝法、纺粘法和熔喷法等聚乳酸（PLA）非织造材料制备工艺,重点介绍和分析了成纤改性、成网改性和后整理等PLA非织造材料亲水改性方法,阐述了PLA非织造材料在医疗卫生领域的用途,包括药物缓释、伤口敷料和口罩制造等;最后,对PLA非织造材料亲水改性未来的发展趋势进行了展望。     

Effect of modified ZnO nanoparticle on the properties of polylactide ultrafine fibers

Zinc oxide (ZnO) was modified with hexadecyltrimethoxysilane (HDTMS) to obtain hydrophobicity and used to reinforce polylactide (PLA), an environmentally friendly polymer. The PLA/HDTMS-modified ZnO (m-ZnO) nanocomposite prepared by adding m-ZnO to the PLA matrix was fabricated into ultrafine fiber using electrospinning. Neat PLA and PLA/ZnO were used for comparisons. Structural analysis of the nanoparticles proved that the ZnO was modified successfully, and that the modification affected dispersibility and hydrophobicity, as observed by morphological, visual, and water repellency tests. The morphological analysis of the electrospun ultrafine fabrics under suitable conditions confirmed that the nanoparticles were well incorporated, and the desired functional changes were observed. Measurement of water repellency and mechanical, thermal properties were used to analyze the effect of nanoparticle modification and composition on fabrics. © 2019 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2019 , 136, 47446.