IPP/Zn-SEPDM共混物的DMA和SAXS研究

A STUDY ON IPP/ZINC-NEUTRALIZED SULFONATED EPDM BLENDS THROUTH DMA AND X-RAY SCATTERING

本文通过SAXS、DMA和TEM研究了乙丙三元橡胶(EPDM)和乙丙橡胶磺酸锌盐(Zn-SEPDM)对等规聚丙烯(IPP)晶体结构的影响以及IPP/Zn-SEPDM和IPP/EPDM共混物的相容性。用一维电子密度函数分别求得IPP晶区、非晶区和聚丙烯晶相和非晶过渡层厚度,用虚拟两相模型描述了IPP的晶体结构。EPDM和Zn-SEPDM与IPP的非晶相和过渡相均有一定相互作用,随磺化度提高,相互作用增强。由于在乙丙橡胶分子链中引入了磺酸锌盐基团,离子基团聚集成离子微区,形成物理交联点,抑制了共混物的相分离,提高了制品的韧性和强度。

The effect of Zinc-neutralized sulfonated EPDM(Zn-SEPDM)and EPDM on the crystalline and amorphous regions of isotactic polypropylene (IPP)and the compatibility of IPP/EPDM and IPP/Zn-SEPDM blends were studied through SAXS.DMA and TEM . The experimental results show that a transition phase exists between the crystalline and amorphous regions of IPP. The thickness of crystalline and amorphous regions and transition phase were estimated through one-dimension electron density function . The crystal structure of IPP was well described by pseudo two-phase structure model. Both EPDM and Zn-SEPDM have interactions with the amorphous region and the transition phase. The interaction increases with the sulfonation level. The Zinc sul-fonate groups incorporated in EPDM serves as physical crosslinks, the phase separation of the blends is retarded.