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报道了苯乙烯－丙烯等规嵌段共聚物（ｉＰＳ－ｂ－ｉＰＰ）增溶作用及ｉＰＳ－ｂ－ｉＰＰ／ｉＰＳ／ｉＰＰ三组分共混体系微观形态和力学性能的研究结果。ｉＰＳ－ｂ－ｉＰＰ的加入明显地改善了ｉＰＳ／ｉＰＰ二组分共混物的力学性能；共聚物含量超过１５％时，三组分共混物的抗冲击强度超过ＮＩＰＳ的抗冲击强度，并具有较高的耐热性。ＳＥＭ结果表明，ｉＰＳ－ｂ－ｉＰＰ在ｉＰＳ／ｉＰＰ共混中起到了相分散和相间“偶联”作用，并降低了共混体系的微相尺寸和增加相间相互作用或粘附性。ｉＰＳ－ｂ－ｉＰＰ／ｉＰＳ／ｉＰＰ共混合金具有高的软化温度和刚性。
The results of the solubilization of styrene-propylene isotactic block copolymer (iPS-b-iPP) and the micro-morphology and mechanical properties of the iPS-b-iPP / iPS / iPP blend system were reported. The addition of iPS-b-iPP significantly improved the mechanical properties of iPS / iPP two-component blends. When the content of copolymer was more than 15%, the impact resistance of three-component blends exceeded the impact strength of NIPS and Has high heat resistance. SEM results showed that iPS-b-iPP played the role of phase-dispersion and interphase “coupling” in iPS / iPP blends, and reduced the micro-phase size and interphase interaction or adhesion of the blends. iPS-b-iPP / iPS / iPP blend alloy has high softening temperature and rigidity.