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首页> 外文期刊>Journal of Applied Polymer Science >Thermal Properties of Extruded and Injection-Molded Poly(lactic Acid)-Based Cuphea and Lesquerella Bio-Composites
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Thermal Properties of Extruded and Injection-Molded Poly(lactic Acid)-Based Cuphea and Lesquerella Bio-Composites

机译：挤出和注塑成型的聚乳酸基铜绿和莱斯克氏菌生物复合材料的热性能

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The degree of compatibility between poly (lactic acid) (PLA) and different bio-fillers was examined using thermal methods. The biofillers were fibers extracted from cuphea and lesquerella seeds. Bio-composites of PLA:Fiber were prepared at 85 : 15, 70 : 30, and 100 : 00 and blended by extrusion and then injection molding. Thermal properties of the extruded (EX) and the extruded-injection molded (EXIM) composites were examined using differential scanning calorimetry (DSC) and thermo gravimetric analysis (TGA). Composites analysis using DSC provided information essential for determining: (1) glass transition (7,); (2) crystallization and melting temperatures and Delta H; (3) percent crystallinity; and (4) Enthalpic Relaxation (ER). TGA was used to measure the mechanism of the thermal decomposition of the composites. The effect of fiber composition, processing conditions, and aging time on the thermal properties of the bio-composites was used to examine the relative compatibility of the fibers with PLA. The data showed that ER increased steadily as a function of aging. Because of the difference in protein content between cuphea and lesquerella, the two fibers influenced the T-g (temperature and Delta C-p) differently. The percent crystallinity of neat PLA was significantly reduced by EX or EXIM, while the enzymatic degradation showed that EX composites are more biodegradable than EXIM. The TGA profiles indicated a multi-step degradation especially in air. The largest value of q, which indicated that, intermolecular interaction was strongest between lesquerella and PLA extruded materials, compared to the other three blends, possibly due to the higher protein content. Results also indicated that intermolecular interaction was least strong (q = -33.9156) in the EXIM PLA-cuphea. Although the q values of both cuphea composites were significantly lower than those of the lesquerella samples, this greater effect of extrusion over injection molding on intermolecular interaction was also seen in the q value of the EX and EXIM samples. (C) 2008 Wiley Periodicals, Inc.(dagger) J Appl Polym Sci 111: 114-124,2009
机译：使用热方法检查了聚乳酸（PLA）与不同生物填充剂之间的相容性程度。生物填充剂是从铜杯属和鞭毛虫种子中提取的纤维。分别以85：15、70：30和100：00的比例制备PLA：Fiber的生物复合材料，并通过挤出和注塑成型进行共混。使用差示扫描量热法（DSC）和热重分析（TGA）检查了挤出（EX）和挤出注塑（EXIM）复合材料的热性能。使用DSC进行的复合材料分析提供了确定以下信息的必要信息：（1）玻璃化转变（7，）; （2）结晶熔融温度和ΔH; （3）结晶度百分比; （4）焓松弛（ER）。 TGA用于测量复合材料的热分解机理。纤维组成，加工条件和老化时间对生物复合材料热性能的影响被用来检验纤维与PLA的相对相容性。数据表明，ER随着衰老而稳定增加。由于cuphea和lesquerella之间蛋白质含量的差异，两条纤维对T-g（温度和Delta C-p）的影响不同。 EX或EXIM可以显着降低纯PLA的结晶度百分比，而酶促降解表明EX复合材料比EXIM更具生物降解性。 TGA曲线表明多步降解，特别是在空气中。 q的最大值表示与其他三种共混物相比，莱斯克雷氏菌和PLA挤出材料之间的分子间相互作用最强。结果还表明，在EXIM PLA杯型中，分子间的相互作用最弱（q = -33.9156）。尽管两种cuphea复合材料的q值均显着低于lesquerella样品的q值，但在EX和EXIM样品的q值中也可以看到挤出比注塑成型对分子间相互作用的更大影响。 （C）2008 Wiley Periodicals，Inc.（匕首）J Appl Polym Sci 111：114-124,2009

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