工艺温度对超临界CO_2发泡PMMA微孔结构的影响  

Effect of foaming temperatures on the microcellular structure of PMMA

作　　者：何亚东[1] 信春玲[1] 李庆春[1] 王珊[1] 

机构地区：[1]北京化工大学机电工程学院,北京100029

出　　处：《北京化工大学学报（自然科学版）》2009年第2期38-42,共5页Journal of Beijing University of Chemical Technology(Natural Science Edition)

基　　金：北京市科技新星计划(2005B16);北京市服装材料研究开发与评价重点实验室开放基金

摘　　要：以超临界CO2为发泡剂,采用升温法和降压法制备PMMA微孔发泡材料,重点考察了发泡温度对所得PMMA微孔结构的影响。研究结果表明:对于升温法,随发泡温度升高,泡孔密度先增大后减小,这是高温下泡孔破裂合并的结果;对于降压法,随发泡温度升高,泡孔密度减小,泡孔尺寸增大,这与CO2在PMMA中的溶解度随温度升高而降低相关。PMMA microcellular materials were obtained by using an elevated temperature method and a decompression method with supercritical CO2 as the foaming agent. The effect of varying foaming temperatures on the microcellular structure was thoroughly investigated. The results showed that using the elevated temperature method the cell density first increased and then decreased with increasing foaming temperature, due to cell coalescence. In contrast, using the decompression method, the cell density decreased and cell diameter increased monotonically with increasing foaming temperature which may be related to the reduced solubility of CO2 in PMMA at higher temperatures.

关 键 词：发泡温度 微孔 泡孔密度 泡孔尺寸 

分 类 号：TQ325.7[化学工程—合成树脂塑料工业]