工艺与制造英文2024被引 5
PP-g-MAH对热塑性拉挤工艺长玻纤/聚丙烯颗粒注射成型力学性能的影响
The Impact of PP-g-MAH on Mechanical Properties of Injection Molding of Long Glass Fiber/Polypropylene Pellets from Thermoplastic Pultrusion Process
Ponlapath Tipboonsri, Anin Memon · Department of Industrial Engineering, Faculty of Engineering, Rajamangala University of Technology Thanyaburi (RMUTT), Klong Luang 12110, Thailand
摘要整理
长纤维热塑性颗粒(LFTP)是含有不连续增强纤维和基体的颗粒,具有优异的力学性能、良好的可加工性、可回收性和低成本等优点。商业LFTP通常采用热熔浸渍工艺(结合挤出和拉挤)制造。虽然热塑性拉挤工艺具有设备简单、工艺易行的优势,但其制得的LFTP力学性能尚未达到商业产品水平。本研究采用聚丙烯-接-马来酸酐(PP-g-MAH)作为偶联剂,通过注射成型工艺改善热塑性拉挤制备的LFTP的力学性能。LFTP由玻纤增强的聚丙烯基体组成。通过在注射成型过程中引入4、8和12 wt% PP-g-MAH,研究了LFTP的力学和物理性能。结果表明,当PP-g-MAH浓度为4 wt%时,LFTP复合材料的拉伸强度、弯曲强度和冲击强度达到最高值;超过4 wt%后,这些性能开始下降。PP-g-MAH通过增强玻纤与基体间的界面粘结而改善了复合材料性能。但过量的PP-g-MAH会导致分子量降低,进而降低冲击强度、拉伸模量和弯曲模量。SEM形貌分析表明,PP-g-MAH的加入改善了界面结合并减少了纤维拔出现象。FTIR光谱确认了马来酸酐在LFTP中的存在。含4 wt% PP-g-MAH的LFTP复合材料的力学性能与商业LFTP相当或更优。
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