PMMA/Al复合粒子的制备及其热特性研究

Preparation and Thermal Property of PMMA/Al Composite Particle

采用表面引发原位聚合法制备了PMMA/Al复合粒子,其过程分为2步:引发剂在铝粉表面的吸附、单体在铝粉表面的聚合。研究表明,只有在pH<7的条件下,引发剂才可能吸附在铝粉表面,其吸附过程可用与Langmuir吸附等温式相似的经验公式来描述;当m(MMA)/m(Al)=60%、m(APS)/m(MMA)=10%时,单体转化率、接枝率与接枝效率可达较优值;复合粒子的失重是由于有机聚合物的分解造成的,而其增重则是由于AlN形成的缘故。

PMMA/Al composite particle was prepared by surface-initiated in situ polymerization, and the process was divided into two steps： adsorption of initiator and polymerization of monomer. It was found that only under pH〈7 can initiator be adsorbed onto aluminum powder, and it may be described as experiential equation similar to Langmuir isothermal model. As for the process of in situ polymerization, the conversion of monomer （C）, percentage of grafting （PG） and grafting efficiency （GE） could attain satisfactory value under following conditions： m（MMA）/m （Al） = 60% and m （APS）/m （MMA） = 10%. The thermal property of composite particle was characterized by TG analysis, which indicated that the weight loss was due to decomposition of organic polymer, while the increase of weight could be explained with the formation of AlN.