摘要
在纳米SiO2表面引入聚酰胺胺树枝状大分子(PAMAM),再通过原子转移自由基聚合(A-TRP)合成了一种核-壳结构的SiO2-PAMAM-PS,将改性的纳米SiO2添加到PS基体中作为超临界CO2发泡的成核剂。红外光谱(IR)、差示扫描量热仪(DSC)、热重(TG)等结果表明,SiO2表面成功引入了PAMAM,并且接枝上了PS链段。透射电镜(TEM)显示该成核剂具有核-壳结构及其在PS基体中可以较均匀分散。将添加了改性SiO2的PS进行了超临界CO2发泡,利用扫描电镜(SEM)对泡孔结构进行了表征,结果表明:相比于纯发泡PS,成核剂的加入,改善了PS的泡孔结构,使泡孔尺寸显著减小,泡孔密度明显增加。
The surface of nano SiO2 particles was grafted with polyamidoamine dendrimer（PAMAM）.And a core-shell SiO2-PAMAM grafted polystyrene（PS） composite was synthesized by the atom transfer radical polymerization（ATRP） method,which was used as a nucleating agent in PS matrix for supercritical CO2 foaming.The result of infrared spectroscopy（IR）,differential scanning calorimetry（DSC）,thermogravimetry（TG）showed that PAMAM and PS chain were successfully grafted on the surface of SiO2.The core-shell structure and well dispersion of the composite in the PS matrix was observed by transmission electron microscopy（TEM）.Scanning electron microscopy（SEM）images of PS foams indicated that,compared to pure PS foam,the addition of SiO2-PAMAM-PS significantly improved the cell structure,reduced the cell size and increased the cell concentration.
出处
《科技通报》
北大核心
2011年第6期886-889,共4页
Bulletin of Science and Technology
基金
国家自然科学基金(NO.50903070)
浙江省自然科学基金(NO.Y4090363和Y4090502)
浙江省新苗人才计划(2009R403006)
