摘要
用MBS和SBS协同增韧具有耐高温但又具脆性的无规SMA。研究表明,SMA与MBS和SBS共混时,SMA和MBS的PMMA壳有很好的相容性,与SBS的PS链段部分相容,虽然MBS增韧SMA的效果比SBS好,但却有限。MBS和SBS以合适的比例共同增韧SMA时,合金的缺口冲击强度大于各自单独增韧SMA的相应值,并且当两者比为某一值时出现极大值,该极大值随两者总量提高而增大。电镜观测表明,在合金中MBS以约0.2μm直径的球状颗粒存在,而SBS以约10μm的不规则团状物出现。协同增韧效应的产生与MBS和SBS尺寸密切相关。
Styrene maleic anhydride (SMA) copolymers were toughened by blending with two distinctly different rubber modifiers: styrene-butadiene-styrene (SBS) block copolymer and methacrylated butadiene-styrene emulsion-made graft copolymer(MBS). SMA is well compatible with grafted portion(PMMA) of MBS, and partially compatible with non-butadiene portion(PS) of SBS. The synergistic effect in toughening SMA was dramatically observed by means of notched Izod impact strength measurements. The maximum Izod values occurred with the variation of MBS/SBS ratio at fixed total contents of rubber modifiers. The particle sizes for MBS and SBS in SMA matrix were about (0.2) μm and 10 μm, respectively. It was concluded that the occurrence of synergistic effect in this study is more likely to be attributed to the difference in the rubber particles size, instead of their compatibility with SMA matrix.
出处
《高分子材料科学与工程》
EI
CAS
CSCD
北大核心
2003年第6期131-133,138,共4页
Polymer Materials Science & Engineering
