RTM成型玻璃纤维增强阴离子聚合尼龙6复合材料及其性能

Preparation and properties of glass fiber-reinforced anionic nylon 6 composites by RTM process

针对己内酰胺阴离子聚合反应特性,通过自行设计的适合该反应体系的树脂注射成型机和搭建的热塑性树脂传递模塑(T-RTM)成型实验平台,在恒压注射条件下,成功地制备了玻璃纤维(GF)体积分数高达48vol%的GF增强阴离子聚合尼龙6(APA-6)复合材料。研究了不同进料方式和压力、模具温度和纤维含量等工艺条件对GF/APA-6复合材料制品的表观质量、结晶度、热变形温度和力学性能的影响。结果表明,采取真空与加压相结合的进料方式并保持一定的溢流量,当注射压力在0.5~1.0 MPa时可以得到表面无缺陷、性能优异的制品;在模具温度为150℃时,GF/APA-6复合材料的弯曲强度和模量最高,分别达到682.7 MPa和24.4 GPa;而在180℃时,复合材料的层间剪切强度最高可达62.3 MPa。

Under constant pressure injection condition, glass fiber(GF) reinforced anionic polyamide-6(APA-6)composites with up to 48 vol% fiber contents were successfully manufactured using resin injection molding machine suitable for the reaction system and thermoplastic resin transfer molding(T-RTM) experimental platform which was designed for the process, utilizing the anionic polymerization of caprolactam. The effects of feeding methods, injection pressure, mold temperature and fiber contents on the apparent mass, crystallinity, thermal deformation temperature and mechanical properties of the products were studied. The results show that product with no defect on the surface and excellent performance can be obtained when the injection pressure is 0.5-1.0 MPa under the vacuum pressure with a certain overflow flow. The bending strength and modulus of GF/APA-6 composites reach the highest, 682.7 MPa and 24.4 GPa, respectively when the mold temperature is 150℃. Then, the interlaminar shear strength(ILSS) of composite materials can reach up to 62.3 MPa at 180℃.