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《Science & Technology Review》 2011-06
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Progress in Nucleating Agents for Polyamide

SHI Jiangong1,ZHAO Guiliang1,ZHANG Minhong1,GAO Chao1,LIU Zhijian2,SHI Qinzhi2,YANG Wantai3,ZHAO Limei4 1. Beijing Yanshan Catalyst Branch Company of Sinopec Cotalyst Company,Beijing 102400,China 2. Sinopec Catalyst Company,Beijing 100011,China 3. College of Materials Science and Engineering,Beijing University of Chemical Technology,Beijing 100029,China 4. Resin Application Research Institute,Sinopec Beijing Yanshan Petrochemical Co.,Beijing 102500,China  
Polyamide (PA) nucleating agents are used to improve the crystal structure,increase the crystallization rate,improve the physical-mechanical properties and shorten the forming period. The most common PA nucleating agents can be divided into two groups:inorganic nucleating agents and organic nucleating agents. Inorganic nucleating agents include clay (kaolin,MMT,terra-cotta and TALC etc.),oxide (nano-SiO2,nano-ZrO2,nano-TiO2,Nd2O3,MgO,ZnO crystal whisker etc.),and inorganic salts (nano-CaCO3,CaF2,MgSO4 crystal whisker etc.),which are the earliest nucleating agents to be used. Inorganic nucleating agents have the advantages of being cheap,easy to obtain and easy to be used and they are heterogeneous in PA,and are not easy to disperse uniformly. Organic nucleating agents include low molecular compounds (such as amide,osphinate etc.) and polymer (polycarbonate,polyphenylene sulfide,carbon fiber etc.). The organics are easy to disperse in PA and enjoy good performances. Compound nucleating agents possess both the advantages of organic and inorganic nucleating agents. The synergistic effect is obvious with excellent performances. Therefore,the compound nucleating agents have a very promising future,but the nucleating mechanism and application require further studies.
【CateGory Index】: TQ325.14
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