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首页> 外文期刊>Journal of Materials Science >MFC-structured biodegradable poly(l-lactide)/poly(butylene adipate-co-terephatalate) blends with improved mechanical and barrier properties
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MFC-structured biodegradable poly(l-lactide)/poly(butylene adipate-co-terephatalate) blends with improved mechanical and barrier properties

机译：MFC结构的可生物降解的聚（l-丙交酯）/聚（己二酸丁二酯-对苯二酸丁二醇酯）共混物，具有改善的机械性能和阻隔性能

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摘要

Both polylactide (PLA) and poly(butylene adipate-co-terephthalate) (PBAT) are biodegradable polymers. They are thermoplastics which can be processed using conventional polymer processing methods. In this study, microfibrillar- reinforced composites (MFC) based on PLA/PBAT (PLA/Ecoflex~?) blends in different weight ratios were prepared under industry-relevant conditions by melt extrusion followed by continuous cold drawing of the extrudates. Strip-like specimens (films) and plates (laminates) of the drawn blends were prepared by compression molding (CM) at processing temperature above the melting temperature (T _m) of PBAT, but below T _m of PLA. SEM and WAXS observations show that the extruded blend components are isotropic, but become highly oriented after drawing, and they are converted into MFC-structured polymer-polymer composites after CM. An effect of PLA microfibrils on the non-isothermal crystallization of the Ecoflex during cooling from the melt, associated with the formation of crystalline regions of the matrix around the fibrils, was observed. Depending on the blend composition, the compression-molded samples possess a 3- to 7-time higher tensile strength as well as a 15-30 higher modulus than the neat Ecoflex. In addition, the MFC-structured plates exhibited superior barrier properties compared to the neat Ecoflex, e.g., the oxygen permeability decreased by up to 5 times.
机译：聚丙交酯（PLA）和聚己二酸丁二酯-对苯二甲酸对苯二甲酸酯（PBAT）都是可生物降解的聚合物。它们是可以使用常规聚合物加工方法加工的热塑性塑料。在这项研究中，在工业相关的条件下，通过熔融挤出，然后对挤出物进行连续冷拉伸，制备了不同重量比的基于PLA / PBAT（PLA / Ecoflex？）共混物的微纤维增强复合材料（MFC）。在高于PBAT熔融温度（T_m）但低于PLA的T_m的加工温度下，通过压缩成型（CM）制备拉伸混合物的带状样品（薄膜）和板（层压板）。 SEM和WAXS观察表明，挤出的共混物组分是各向同性的，但是在拉伸后变得高度取向，并且在CM后它们被转化为MFC结构的聚合物-聚合物复合材料。观察到从熔体冷却期间PLA微纤丝对Ecoflex的非等温结晶的影响，这与纤丝周围基质的结晶区域的形成有关。取决于共混物的组成，与纯净的Ecoflex相比，压塑样品的拉伸强度高3至7倍，模量高15至30。另外，与纯净的Ecoflex相比，MFC结构的板表现出优异的阻隔性能，例如，氧渗透率最多降低5倍。

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