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首页> 外文期刊>Journal of Applied Polymer Science >Preparation and characterization of grafting styrene onto LLDPE by cyclohexane compatibilization in suspension polymerization
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Preparation and characterization of grafting styrene onto LLDPE by cyclohexane compatibilization in suspension polymerization

机译：悬浮聚合中环己烷相容化苯乙烯接枝LLDPE的制备与表征

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A novel method of grafting styrene onto linear low-density polyethylene (LLDPE) by suspension polymerization was systematically evaluated. Cyclohexane as a compatibilizer was introduced to swell and activate the surface of LLDPE molecular chain for amplifying the contact point of styrene monomer with LLDPE. A series of copolymer of grafting polystyrene (PS) onto LLDPE, known as LLDPE-g-PS, were prepared with different ratios of cyclohexane/styrene monomer and various LLDPE dosages. FTIR and H-1 NMR techniques both confirmed successful PS grafting onto the LLDPE chains. In addition, SEM images of LLDPE-g-PS particles showed that the cross-section morphology becomes smooth and dense with suitable cyclohexane dosages, indicating a better compatibility between LLDPE and PS. The highest grafting efficiency was 28.4% at 10 mL/g cyclohexane and styrene monomer when 8% LLDPE was added. In these conditions, the LLDPE-g-PS elongation at break increased by about 30 times compared with PS. Moreover, thermal gravimetric analysis (TGA) demonstrated that LLDPE-g-PS possesses much higher thermal stability than pure PS. Therefore, the optimal amount of cyclohexane as compatibilizer could increase the grafting efficiency and improve the toughness of PS. (c) 2014 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2015, 132, 41671.
机译：系统评价了一种通过悬浮聚合将苯乙烯接枝到线性低密度聚乙烯（LLDPE）上的新方法。引入环己烷作为增容剂以溶胀并活化LLDPE分子链的表面，以放大苯乙烯单体与LLDPE的接触点。以不同比例的环己烷/苯乙烯单体和不同的LLDPE用量，制备了一系列将聚苯乙烯（PS）接枝到LLDPE上的共聚物，称为LLDPE-g-PS。 FTIR和H-1 NMR技术均证实PS成功接枝到LLDPE链上。此外，LLDPE-g-PS颗粒的SEM图像显示，在适当的环己烷用量下，横截面形态变得平滑而致密，表明LLDPE和PS之间具有更好的相容性。当添加8％LLDPE时，在10 mL / g环己烷和苯乙烯单体下，最高接枝效率为28.4％。在这些条件下，与PS相比，LLDPE-g-PS的断裂伸长率增加了约30倍。此外，热重分析（TGA）表明LLDPE-g-PS具有比纯PS高得多的热稳定性。因此，最适量的环己烷作为增容剂可以提高接枝效率，提高聚苯乙烯的韧性。 （c）2014 Wiley Periodicals，Inc. J. Appl。 Polym。科学2015，132，41671。

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