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首页> 外文期刊>Journal of Polymers and the Environment >Characterization and Properties of Reactive Poly (Lactic Acid)/Ethylene-Vinyl Alcohol Copolymer Blends with Chain-Extender
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Characterization and Properties of Reactive Poly (Lactic Acid)/Ethylene-Vinyl Alcohol Copolymer Blends with Chain-Extender

机译：扩链剂与反应性聚乳酸/乙烯-乙烯醇共聚物共混物的表征与性能

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摘要

A hydrophilic copolymer, ethylene-vinyl alcohol (EVOH), was incorporated into the poly(lactic acid) (PLA) matrix to improve the barrier property of PLA through twin-screw extrusion rather than the typical coextrusion process. A chain extender, poly[(ethylene)-co-(methyl acrylate)-co-(glycidyl methacrylate)] (PEMG), was used to reduce the probability of the thermal degradation of PLA during melt compounding. Biaxial stretching was used to enhance the microstructure and barrier property of PLA-PEMG/EVOH films. Experimentally, PEMG considerably reduced the probability of the thermal degradation of the PLA-PEMG sample. Biaxial stretching increased the tensile strength and decreased the value of elongation at break of the PLA-PEMG/EVOH80 (PLA/EVOH 100/80) film. Because of the efficient blending of PLA/EVOH in the twin-screw extruder, the dispersion of EVOH in the PLA matrix revealed homogeneous dispersion with a domain size of 1-5 mu m. EVOH effectively improved the water vapour transmission rate (WVTR) of PLA through melt blending. Blending PLA-PEMG with EVOH substantially decreased the WVTR from 250 cc-20 mu m/m(2)-day-atm for neat PLA to approximately 65 cc-20 mu m/m(2)-day-atm for the PLA-PEMG/EVOH80 film, a decrease of approximately 74 % compared with neat PLA. Moreover, the WVTR decreased further from 65 cc-20 mu m/m(2)-day-atm for the unstretched PLA-PEMG/EVOH80 film to 6.3 cc-20 mu m/m(2)-day-atm for the film stretched at a stretch ratio of 3.5 x 3.5 and at 100 %/s, a decrease of approximately 90 % compared with neat PLA.
机译：将亲水共聚物乙烯-乙烯醇（EVOH）掺入聚（乳酸）（PLA）基体中，以通过双螺杆挤出而非常规共挤出工艺改善PLA的阻隔性能。使用扩链剂聚[（乙烯）-共-（丙烯酸甲酯）-共-（甲基丙烯酸缩水甘油酯）]（PEMG）来降低PLA在熔融配混过程中热降解的可能性。使用双轴拉伸来增强PLA-PEMG / EVOH薄膜的微观结构和阻隔性能。实验上，PEMG大大降低了PLA-PEMG样品热降解的可能性。双轴拉伸提高了PLA-PEMG / EVOH80（PLA / EVOH 100/80）膜的拉伸强度，并降低了断裂伸长率。由于在双螺杆挤出机中有效混合了PLA / EVOH，因此EVOH在PLA基质中的分散体显示出均匀分散，其畴尺寸为1-5微米。 EVOH通过熔融共混有效提高了PLA的水蒸气透过率（WVTR）。将PLA-PEMG与EVOH混合后，WVTR将从纯PLA的250 cc-20μm/ m（2）-at-atm降低到PLA-PE的约65 cc-20μm/ m（2）-at-atm。 PEMG / EVOH80薄膜与纯PLA相比减少了约74％。此外，WVTR从未拉伸的PLA-PEMG / EVOH80膜的65 cc-20μm / m（2）-day-atm进一步降低到了6.3 cc-20μm/ m（2）-day-atm的膜以3.5 x 3.5的拉伸比和100％/ s的速度拉伸，与纯PLA相比减少了约90％。

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