PA66／E-RTMB增韧体系的化学结构及性能

Chemical Structure and Property of Toughened PA66/E-RTMB System

用环氧化合物与助反应剂配比(C/R)不同的E型反应性增韧母料(E-RTMB)与PA66热机械反应性共混制备出了PA66/E-RTMB(C/R)增韧体系,研究了PA66/E-RTMB(C/R)增韧体系的化学结构、熔体质量流动速率(MFR)、力学性能及非等温熔融和结晶行为。结果表明,PA66/E-RTMB中E-RTMB与PA66间形成了化学键连接;与原料PA66相比,PA66/E-TMB(C/R)增韧体系的MFR显著减小,悬臂梁缺口冲击强度显著提高,拉伸屈服应力及弯曲模量稍有降低;与原料PA66、HDPE相比,PA66/E-RTMB(C/R)增韧体系中PA66、HDPE的熔点有所降低,热结晶起始温度有不同程度的提高,HDPE的结晶过程很弥散,PA66晶核形成及晶体生长速率明显提高;E-RTMB的C/R对PA66/E-RTMB(C/R)增韧体系的MFR、冲击强度及PA66、HDPE的非等温熔融和结晶行为有明显影响。

Toughened PA66/E-RTMB （C/R） systems were prepared by thermal mechanical reactive blending of PA66 wiith E-type reactive toughening master batch （E-RTMB）, in which E-RTMB had different ratio of epoxy compounds with assistant reactant. The chemical structure, melt flow rate （MFR）, mechanical properties and non-isothermal melt crystallization behavior of the systems were studied by means of IR etc. The results indicated E- RTMB and PA66 were crosslinked by chemical bonds in PA66/E-RTMB; the MFR of the systems was markedly lower, while the notchod Izod impact strength （NIIS） was markedly higher, tensile yield stress （TYS） and flexural modulus （FM） were slightly higher than that of pure PA66; the melting point of PA66 and HDPE in the systems showed lower, but hot crystallization onset temperature showed higher to some extent than that of pure PA66 and HDPE. The process of crystalline of HDPE was dispersion, and the crystal nucleus forming rate and crystal developing rate of PA66 markedly increased. The C/R of E-RTMB had obvious effect on MFR, NIIS and nonisothermal melt crystallization behavior of PA66 and HDPE of the systems.