Andrzejewski Jacek, Skórczewska Katarzyna, Kloziński Arkadiusz
Institute of Materials Technology, Polymer Processing Division, Faculty of Mechanical Engineering, Poznan University of Technology, Piotrowo 3, 61-138 Poznan, Poland.
Faculty of Chemical Technology and Engineering, UTP University of Science and Technology, Seminaryjna 3, 85-326 Bydgoszcz, Poland.
Polymers (Basel). 2020 Feb 3;12(2):307. doi: 10.3390/polym12020307.
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.
该研究聚焦于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。研究分两个阶段进行；第一部分制备了一系列PLA含量为25、50和75 wt.%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。使用乙烯/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）来提高所制备共混物的冲击强度，同时采用反应性共混来改善界面相互作用。我们使用多功能环氧扩链剂（CE）作为增容剂。通过静态拉伸试验和缺口悬臂梁冲击试验来评估所制备样品的力学性能。使用动态热机械分析（DMTA）分析以及热变形温度（HDT）/维卡软化温度（VST）方法研究热机械性能。使用差示扫描量热法（DSC）和广角X射线衍射（WAXS）测量来测定结晶度，而使用旋转流变仪评估流变学性能。该论文还包括使用扫描电子显微镜（SEM）方法进行的结构分析。结构测试表明POM/PLA体系存在部分互溶性，从而导致两相的完美相容性。发现由EBA/CE体系改性的最终共混物的冲击性能与纯POM树脂相似，而弹性模量明显提高。在热机械性能方面也有明显的有利变化。大多数所进行的测量和微观观察结果证实了PLA以及改性POM/PLA混合物反应的高效性。
