物理化学学报 >> 1998, Vol. 14 >> Issue (07): 620-623.doi: 10.3866/PKU.WHXB19980709

研究论文 上一篇    下一篇

微波制备均分散无皂高分子纳米微球

汤勇铮, 唐业仓, 罗世忠, 傅中, 张文敏   

  1. 皖南医学院生物化学组，芜湖 241001|安徽师范大学化学系，芜湖 241000
  • 收稿日期:1997-10-28 修回日期:1998-03-09 发布日期:1998-07-15
  • 通讯作者:

Microwave Preparation of Narrowly Distributed Surfactant-free Macromolecular Nanospheres

Tang Yong-Zheng, Tang Ye-Cang, Luo Shi-Zhong, Fu Zhong, Zhang Wen-Min   

  1. Department of Biochemistry,Wannan Medical College,Wuhu 241001|Department of Chemistry the Anhui Normal University,Wuhu 241000
  • Received:1997-10-28 Revised:1998-03-09 Published:1998-07-15
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摘要：

在常压微波辐照下合成了聚甲基丙烯酸甲酯（PMMA）、聚苯乙烯（PSt）均分散纳米粒子. 体系中未加表面活性剂．与常法相比，反应时间大为缩短．比较PMMA与PSt的粒子形成速度，前者明显大于后者．这可能与MMA对微波的吸收较强有关．在引发剂浓度一定的条件下，微球的体积与单体的浓度呈线性关系，即粒子数不随单体的浓度而变化．这一规律性说明了微波辐照有利于一次性成核，这也是微波能制备单分散体系的原因所在．

关键词: 微波合成, 聚甲基丙烯酸甲酯, 均分散胶体微球

Abstract:

The microwave preparation of narrowly distributed colloidal microlatex particles of polymethyl methacrylate (PMMA) and polystyrene (PSt) under normal ambient pressure is re-ported. There are no any surfartants in the system. The total synthesis time has been reduced from much longer time(conventional method) to less than 1 h(microwave method). The dynamic experimental results indicate that the reaction velocity of PMMA is faster than PSt, which maybe due to PMMA absorbing much more microwave radation than PSt. The particle size can be controlled by changing initial recipe. The microparticle volume is plotted versus the concentration of the added monomer at constant concentration of initiator. The linear least-square fitting convincingly shows that the number of the particles is constant. This fact also indicates that the microwave radiation favors the simultaneous nucleation and results in formation of monodisperse system.

Key words: Microwave synthesis, Polymethyl methacrylate, Nerrowly distributed colloidal microspheres