山梨醇和有机磷类成核剂对聚丙烯性能和结晶行为的影响

研究了有机磷类成核剂Irgastab NA—11和ADKNA-21以及山梨醇衍生物类成核剂Irgaelear DM和MiUad3988对聚丙烯性能和结晶行为的影响．研究结果表明，有机磷类成核剂对聚丙烯力学性能的改善效果要优于山梨醇类成核剂，而后者对聚丙烯透明性能的改善效果要优于有机磷类成核剂．同时，有机磷和山梨醇类成核剂对聚丙烯结晶峰温度的影响相类似．当成核剂的浓度为0．2wt％时，与空白聚丙烯相比，IrgastabNA—11和ADKNA-21成核聚丙烯拉伸强度和弯曲模量分别提高19．35％，17．67％和29．48％，24．84％，雾度分别降低43．58％和44．01％；而Irgaclear DM和Millad 3988成核聚丙烯的拉伸强度和弯曲模量分别提高7．03％，7．46％和7．20％，11．96％，雾度分别降低51．03％和52．23％．此外，微观形态研究表明，有机磷和山梨醇类成核剂的加入都可以显著降低聚丙烯的球晶尺寸．

Effects of organic phosphorous and sorbitol derivatives nucleating agents on properties and crystallization behaviors of isotactic polypropylene

Effects of two kinds of organic phosphorous nucleating agents such as Irgastab NA-11 and ADK NA-21 and two kinds of sorbitol derivatives such as Irgaclear DM and Millad 3988 on properties and crystallization behaviors of iPP were studied.The results show that organic phosphorous nucleating agents have better effects on mechanical properties of isotactic polypropylene(iPP) than sorbitol derivatives while the latter had better effects on transparency of iPP than the former.At the same time,organic phosphorous nucleating agents and sorbitol derivatives had similar effects on the crystallization peak temperature(Tc) of iPP.When the concentration of nucleating agents was 0.2 wt%,compared with those of virgin iPP,the tensile strength and flexural modulus of iPP nucleated with Irgastab NA-11 and ADK NA-21 were increased by 19.35%,17.67% and 29.48%,24.84%,and the haze value was decreased by 43.58% and 44.01%,respectively.While the tensile strength and flexural modulus of iPP nucleated with Irgaclear DM and Millad 3988 were increased by 7.03%,7.46% and 7.20%,11.96%,and the haze value was decreased by 51.03% and 52.23%,respectively.Meanwhile,the morphology study shows that the addition of both organic phosphorous and sorbitol derivatives could significantly decrease the spherulite size of iPP.