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首页> 美国卫生研究院文献>Polymers >Improving the Toughness and Thermal Resistance of Polyoxymethylene/Poly(lactic acid) Blends: Evaluation of Structure–Properties Correlation for Reactive Processing
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Improving the Toughness and Thermal Resistance of Polyoxymethylene/Poly(lactic acid) Blends: Evaluation of Structure–Properties Correlation for Reactive Processing

机译：改善聚甲醛/聚（乳酸）共混物的韧性和耐热性：反应加工的结构-性能相关性评估

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The study focuses on the development of polyoxymethylene (POM)/poly(lactic acid) (PLA) blends with increased impact and thermal resistance. The study was conducted in two phases; in the first part, a series of unmodified blends with PLA content of 25, 50, and 75 wt.% was prepared, while the second part focused on the modification of the PLA/POM (50/50) blends. An ethylene/butyl acrylate/glycidyl methacrylate terpolymer (E/BA/GMA) elastomer (EBA) was used to improve the impact strength of the prepared blends, while reactive blending was used to improve interfacial interactions. We used a multifunctional epoxy chain extender (CE) as the compatibilizer. Static tensile tests and notched Izod measurement were used to evaluate the mechanical performance of the prepared samples. The thermomechanical properties were investigated using dynamic mechanical thermal analysis (DMTA) analysis and heat deflection temperature (HDT)/Vicat softening temperature (VST) methods. The crystallinity was measured using differential scanning calorimetry (DSC) and wide-angle X-ray diffraction (WAXS) measurements, while the rheology was evaluated using a rotational rheometer. The paper also includes a structure analysis performed using the SEM method. The structural tests show partial miscibility of the POM/PLA systems, resulting in the perfect compatibility of both phases. The impact properties of the final blends modified by the EBA/CE system were found to be similar to pure POM resin, while the E modulus was visibly improved. Favorable changes were also noticeable in the case of the thermomechanical properties. The results of most of the conducted measurements and microscopic observations confirm the high efficiency of the reaction for PLA as well as for the modified POM/PLA mixtures.
机译：该研究的重点是开发具有更高抗冲击性和耐热性的聚甲醛（POM）/聚乳酸（PLA）共混物。该研究分两个阶段进行：在第一部分中，制备了一系列PLA含量分别为25％，50％和75％（重量）的未改性共混物，而第二部分则着重于PLA / POM（50/50）共混物的改性。乙烯/丙烯酸丁酯/甲基丙烯酸缩水甘油酯三元共聚物（E / BA / GMA）弹性体（EBA）用于提高制备的共混物的冲击强度，而反应性共混用于改善界面相互作用。我们使用了多功能环氧扩链剂（CE）作为增容剂。静态拉伸试验和缺口悬臂梁式测量用于评估制备样品的机械性能。使用动态机械热分析（DMTA）分析和热变形温度（HDT）/维卡软化温度（VST）方法研究了热机械性能。使用差示扫描量热法（DSC）和广角X射线衍射（WAXS）测量来测量结晶度，同时使用旋转流变仪评估流变性。本文还包括使用SEM方法进行的结构分析。结构测试表明POM / PLA系统具有部分混溶性，从而使两相具有完美的兼容性。发现通过EBA / CE系统改性的最终共混物的冲击性能与纯POM树脂相似，而E模量明显提高。在热机械性质的情况下，有利的变化也是值得注意的。大多数进行的测量和显微镜观察的结果证实，对于PLA以及改性的POM / PLA混合物，反应具有很高的效率。

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