研究了一种β成核剂（ CHB-5）的含量对等规聚丙烯（ iPP）结晶性能和力学性能的影响。用广角X射线衍射（WAXD）研究CHB-5诱导iPP晶型的变化，用差示扫描量热法（DSC）分析CHB-5对iPP熔融行为和结晶行为的影响，用偏光显微镜（ POM）观察CHB-5诱导iPP结晶形态的变化。结果表明，CHB-5的加入使iPP的成核能力增强；CHB-5可降低iPP的熔融温度，提高其结晶温度和结晶起始温度，加快结晶速率；CHB-5能降低球晶尺寸；CHB-5的加入可使iPP缺口冲击强度提高。
The effect of a kind of βnucleating agent ( CHB-5) content on crystallization properties and mechani-cal properties of isotactic polypropylene ( iPP ) was studied.The influence of iPP induced by CHB -5 were re-searched by means of wide angle X ray diffraction ( WAXD)、differential scanning calorimetry ( DSC)、polarizing opti-cal microscope ( POM).The change of the crystal structure was studied by using the WAXD;The melting behavior and crystallization behavior was researched by using the DSC;The crystalline form was discussed by using POM.As a result ,with the addition of CHB -5,nucleated iPP showed a larger nuclear capability ,a higher crystallization tempera-ture and initial crystallization temperature ,a faster crystallization rate.The melting temperature was decreased and the spherulites of nucleated iPP became small.Meanwhile ,the impact strength of nucleated iPP appeared increase.
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