膨润土杂化改性聚丙烯共混体系性能研究
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摘要
以乙醇为分散介质,过氧化二苯甲酰为引发剂,硫代硫酸钠为催化剂,合成了与聚丙烯具有良好复配性能的膨润土杂化改性聚苯乙烯材料(PS/H)。研究了PP/PS、PP/(PS/H)共混体系的性能。结果表明:原位悬浮聚合产物粒子中存在PS及有机改性的膨润土H,且膨润土在聚合产物中分散性良好;对于PP/PS和PP/(PS/H)共混体系,PS及PS/H的加入影响了PP的结晶形态,使共混体系结晶速率增加,相同比例的共混体系PP/(PS/H)对于PP/PS而言,其熔融峰位置向低温偏移,体系熔点略低,其结晶峰位置向高温偏移,结晶温度有较明显的提高;动态温度扫描结果显示,共混体系的表观粘度随着温度的升高而降低,同等PS含量下,由于杂化体系中膨润土的引入,PP/(PS/H)体系的表观粘度高于PP/PS体系;XRD测试结果表明,在熔融共混加工过程中聚合物链没有插层到膨润土片层中。
A bentonite hybrid modified polystyrene material(PS/H) was synthesized using ethanol as dispersing medium,benzoyl peroxide as initiator and sodium thiosulfate as catalyst. The properties of PP/PS,PP/(PS/H) blends were studied. The results showed that PS and organically modified bentonite H existed in the particles of in-situ suspension polymerization products,and the dispersibility of bentonite was good. For PP/PS and PP/(PS/H) blends,the addition of PS and PS/H affected the crystalline morphology of PP and increased the crystallization rate of the blends. For PP/PS and PP/(PS/H) blends with the same proportion,the melting peak position of PP/PS blends was higher. The results of dynamic temperature scanning showed that the apparent viscosity of the blends decreased with the increase of temperature. At the same PS content,the apparent viscosity of PP/(PS/H) system was higher than that of PP/PS system due to the introduction of bentonite in the hybrid system. XRD results showed that the apparent viscosity of PP/(PS/H) system was higher than that of PP/PS system during melting. In the blending process,the polymer chains were not intercalated into the bentonite lamellae.
A bentonite hybrid modified polystyrene material(PS/H) was synthesized using ethanol as dispersing medium,benzoyl peroxide as initiator and sodium thiosulfate as catalyst. The properties of PP/PS,PP/(PS/H) blends were studied. The results showed that PS and organically modified bentonite H existed in the particles of in-situ suspension polymerization products,and the dispersibility of bentonite was good. For PP/PS and PP/(PS/H) blends,the addition of PS and PS/H affected the crystalline morphology of PP and increased the crystallization rate of the blends. For PP/PS and PP/(PS/H) blends with the same proportion,the melting peak position of PP/PS blends was higher. The results of dynamic temperature scanning showed that the apparent viscosity of the blends decreased with the increase of temperature. At the same PS content,the apparent viscosity of PP/(PS/H) system was higher than that of PP/PS system due to the introduction of bentonite in the hybrid system. XRD results showed that the apparent viscosity of PP/(PS/H) system was higher than that of PP/PS system during melting. In the blending process,the polymer chains were not intercalated into the bentonite lamellae.
引文
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[2] Xin H,Hao Y. Blends of Polypropylene and Modified Polystyrene for Dyeable Fibers[J]. Journal of applied polymer science,2005,96:2360-2365.
[3] 张忠厚,冯丽,何领好,等. PBT/PET阻燃材料的非等温结晶动力学[J]. 塑料,2014,43(3):103-106.
[4] Chisholm B J,Zimmer J G. Isothermal crystallization kinetics of commercially important polyalkylene terephthalates[J]. Journal of Applied Polymer Science,2015,76(8):1296-1307.
[5] Voulgaris D,Petridis D. Emulsifying effect of dimethyldioctadecylammonium-hectorite in polystyrene/poly(ethyl methacrylate) blends[J]. Polymer,2002,43(5):2213-2219.
[6] Yu C B,Zhu M F,Chen Y M. Study on Dyeable Polypropylene Fiber and Its properties[J]. Journal of applied polymer science,2001,82(11):3172-3177.
[7] 王连军,刘冠彬,蒋志勇. 纳米氧化铕的表面改性及其在聚丙烯中的分散性能[J]. 中国稀土学报,2012,30(4):465-469.
[8] 花秀兵,张瑜,阎惠至,等.聚丙烯/聚苯乙烯/膨润土共混体系的结晶性能和热性能研究[J].合成纤维,2010(1):18-20.
[9] 邹文奇,温变英,张扬. 酯交换反应对PBT/PC/Al2O3复合材料导热性能的影响[J]. 高分子学报,2016(5):606-613.
[10] 李健,郭星辉,郭明涛,等. 复合材料薄壁圆柱壳动态粘弹性模量研究[J]. 东北大学学报,2008,29(12):1770-1773.
[11] 何曼君,陈维孝. 高分子物理[M]. 上海:复旦大学出版社,2000.