生物降解材料——聚乳酸改性研究进展

综述了近几年聚乳酸生物降解材料的改性进展.改性方法分为化学改性和物理改性.化学改性包括共聚、交联、表面修饰等,主要是通过改变聚合物大分子或表面结构改善其脆性、疏水性及降解速率等;物理改性主要是通过共混、增塑及纤维复合等方法实现对聚乳酸的改性.     

聚乳酸的改性研究及应用

综述了近年来聚乳酸的改性研究进展。化学改性主要有共聚、交联等,物理改性主要是通过共混及增塑方法实现。     

医用聚乳酸材料改性方法及研究进展

主要介绍了医用聚乳酸(PLA)的化学改性和物理改性研究进展情况。化学改性主要包括与小分子共聚改性、嵌段共聚改性、接枝改性和交联改性等,其中,接枝改性包括本体接枝改性与表面接枝改性,这两者根据主要实施方法包括自由基链转移法、等离子接枝法、紫外光氧化接枝法、辐射接枝法等。物理改性则包括无机填料改性与有机共混改性。最后指出了物理及化学改性方法的优缺点,并对医用PLA改性的研究前景进行了展望。     

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。     

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。     

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。     

聚乳酸增韧改性研究进展

主要介绍了聚乳酸的化学增韧改性(共聚改性)和物理增韧改性(增塑、共混与无机刚性粒子复合),综述了近年来国内外聚乳酸增韧改性的研究现状及进展,并对今后聚乳酸增韧改性提出了建议。     

聚乳酸阻燃改性研究进展

聚乳酸是目前最具前景的生物基可降解材料之一，具有诸多优点而被广泛应用于生物医疗与家纺服饰等领域。然而，聚乳酸材料仍存在着易燃烧的不足，限制了其在阻燃要求较高领域的应用与发展，因此聚乳酸阻燃改性迫在眉睫。为更好地掌握聚乳酸阻燃改性现状与发展趋势，本文首先简要介绍了聚乳酸的燃烧过程与阻燃机理，为聚乳酸阻燃改性提供了理论指导。其次，全面综述了聚乳酸阻燃改性的最新进展，包括物理共混、化学共聚与表面修饰等方法，重点阐述了聚乳酸物理共混阻燃改性现状，同时分析总结了不同添加型阻燃剂的优缺点。最后，结合聚乳酸结构特点与阻燃材料发展态势，提出绿色环保、多功能性、高效稳定等阻燃聚乳酸材料将成为未来发展趋势。     

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。     

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。     

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.     

PLA改性研究进展

对聚乳酸(PLA)的基本性质和合成方法,以及PLA改性常用的化学改性、物理改性和复合改性方法研究进展进行了综述,并对其研究趋势进行了展望。     

聚乳酸增韧研究进展

总结了聚乳酸增韧改性方面的最新研究进展,为新型聚乳酸复合材料的研究开发提供理论依据;概述了共混、复合、共聚、交联、增塑以及添加成核剂等几种增韧技术,并比较了不同增韧方法的特点;通过对合成方法的改进以及进行共混、共聚、复合及增塑等改性,可以显著改善聚乳酸材料的力学性能并同时保持耐热性和降解性能不受影响;开发更加高效的增韧改性剂,增加其与聚乳酸分子链间的界面相互作用并提高复合材料的冲击性能已成为研究工作的努力方向。从微观分子尺度上对聚乳酸进行增韧改性以及设计绿色合成路线仍是目前研究工作的重点。     

聚乳酸增韧及结晶改性研究进展

综述了近期在聚乳酸（PLA）材料的成核结晶、立构复合、增韧与耐热改性方面的工作，重点探讨了成核剂化学结构、快速立构复合技术、反应性增容和退火等技术对PLA材料力学性能的影响，并对PLA材料的应用和发展方向进行了展望。     

Preliminary evaluation of packaging‐content interactions: Mechanical and physicochemical characterization of polylactide bottles

Biodegradable materials as polylactide (PLA) are very interesting for cosmetic packaging application. However, these polymers, under environmental conditions or/and chemical treatments, can undergo “aging,” compromising their performances such as container. The aim of this study was the evaluation of mechanical, physicochemical, and organoleptic properties of PLA bottles present in the cosmetic market. In particular, mechanical tests and thermal analyses were applied to study the PLA container degradation under stressed physicochemical conditions. Calorimetric and morphological analyses were applied to evaluate differences between internal and external surface of containers. Results highlighted that the heating process together with chemical treatment determined a significant modification on polymer, leading to a more resistant and fragile material, whereas the only physical or chemical treatment alone showed a plasticizing effect. In conclusion, this study represents a start point to evaluate content–packaging interactions to optimize the choice of PLA polymer as cosmetic packaging. © 2013 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2014 , 131, 40067.     

Surface organo-modification of hydroxyapatites to improve PLA/HA compatibility

Polylactide/hydroxyapatite (PLA/HA) composites are promising tissue engineering materials because of the PLA biodegradability and HA as a natural bone component. PLA/HA composites without HA modification lead to mechanical failure due to the interfacial immiscibility. In this study, an effective chemical surface methodology is used to modify HA to obtain PLA/HA composites with superior mechanical properties. The HA particles are modified with fatty acids (adipic, sebacic, lauric, and linoleic) and incorporated into a PLA matrix by polymer solution casting, using chloroform as the solvent. After the HA modification, the films exhibited an improvement in tensile strength, elongation at break, and elastic modulus. Yet, the best results observed are by sebacic and adipic acid modification. These increments are attributed to a higher affinity of the organo-modified HA particles within the PLA matrix. Therefore, the development of materials for osteo-regeneration engineering based on these systems is quite promising.     

Effects of aromatic groups in polymer chains on plasma surface modification

Three polyester films with different repeating units—poly(lactic acid) (PLA), poly(ethylene terephthalate) (PET), and poly(oxybenzoate‐co‐oxynaphthoate) (PBN)—were modified by plasma, and the way in which the chemical compositions of the polymer chains influenced the plasma modification was investigated with contact‐angle measurements and X‐ray photoelectron spectroscopy (XPS). There were large differences in the compensated rates of weight loss among the three polyester films when they were exposed to Ar and O₂ plasmas. The PLA film showed the highest rate for weight loss of the three films, and the PBN film showed the lowest rate. The PET and PBN film surfaces were modified to become more hydrophilic by either argon or oxygen plasma. However, the PLA film surface was not made more hydrophilic by the plasmas. XPS spectra showed that the PLA film surface was not modified in its chemical composition, but the PBN film surface was modified in its chemical composition to form C? O groups in the PBN polymer chains. The reason that the PLA film surface was not modified but the PBN film surface was modified was examined. © 2003 Wiley Periodicals, Inc. J Appl Polym Sci 89: 96–103, 2003