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首页> 外文期刊>Journal of Polymers and the Environment >Environmentally Friendly Polylactic Acid/Modified Lignosulfonate Biocomposites
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Environmentally Friendly Polylactic Acid/Modified Lignosulfonate Biocomposites

机译：环保型聚乳酸/改性木质素磺酸盐生物复合材料

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摘要

Ammonium lignosulfonate was modified with carboxylic acids (lactic, oleic) and butyrolactone by physical non-polluting radio frequency cold plasma method. Modified lignosulfonates/polylactic acid (PLA)-based biocomposites with enhanced dielectric and thermal properties have been prepared by melt mixing technique. Some modified lignosulfonates improved processability and rheological properties of PLA. A homogeneous dispersion of lignosulfonates in PLA matrix assures the improvement of hydrophilicity, dielectric, rheological properties and thermal performance of the PLA polymer as they act as nucleating agents increasing crystallinity degree. The dielectric characteristics followed in a large frequency and temperature range. Relaxation transitions and their activation energies were found to be dependent on modified lignosulfonate type incorporated in biocomposites. As PLA is recognized by its biodegradability and the composites containing modified lignosulfonates disintegrate by bio- and environmental degradation even they are incorporated in much resistant matrices as polyolefins, it can supposed that such biocomposites could be considered as medium term degradable ones. Increasing modified lignosulfonates content environmental disintegration period could be shorten.
机译：通过物理无污染的射频冷等离子体方法，用羧酸（乳酸，油酸）和丁内酯对木质素磺酸铵进行了改性。通过熔融混合技术已经制备了具有增强的介电和热性能的改性木质素磺酸盐/聚乳酸（PLA）基生物复合材料。一些改性的木质素磺酸盐改善了PLA的可加工性和流变性。木质素磺酸盐在PLA基质中的均匀分散可确保PLA聚合物作为成核剂并提高结晶度，从而改善亲水性，介电性，流变性和热性能。介电特性在较大的频率和温度范围内变化。发现弛豫转变及其活化能取决于掺入生物复合物中的改性木质素磺酸盐类型。由于PLA的生物降解性得到认可，并且含有改性木质素磺酸盐的复合物甚至通过掺入聚烯烃等具有很强抵抗力的基质，也能通过生物和环境降解而分解，因此可以认为此类生物复合物可被视为中期可降解的复合物。缩短改性木质素磺酸盐含量的环境崩解时间可以缩短。

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