摘要
以水为增塑剂兼物理发泡剂,结合超临界二氧化碳发泡技术制备了聚乙烯醇(PVA)/贝壳粉复合泡沫,研究了多种因素对泡孔结构的影响。结果表明,贝壳粉作为异相成核剂,能增加成核点数,提高熔体强度,更好地支撑泡孔形成与生长;提高饱和压力和适度交联能增大二氧化碳在PVA基体中的溶解度,增多泡孔数目,减小尺寸,分布更均匀;发泡温度升高,二氧化碳扩散速度增加,孔径分布变宽。当贝壳粉含量10%、饱和压力15 MPa、发泡温度80℃、交联剂含量0.5%时,获得的复合泡沫结构最优,对Cu(II)、Pb(II)及Cd(II)均有较好的吸附性。
Polyvinyl alcohol (PVA)/shell powder composite foams were prepared by using water as both plasticizer and physical blowing agent combining with supercritical carbon dioxide technology. The results show that shell powders, as heterogeneous nucleating agent, could increase the nucleation point and melt strength of the system, thus better supporting the formation and growth of cells;proper cross-linking increases the solubility of carbon dioxide in the PVA matrix, leading to the decrease of the cell size and increase of the cell number and distribution uniformity. Rising the foaming temperature, the diffusion of carbon dioxide is accelerated, resulting in a more uneven growth rate and distribution of cells. With 10% shell powders and 0.5% crosslinking agent, and at 15 MPa saturation pressure and 80 ℃ foaming temperature, the cell structure of the composite foam is the best, and the foam has good adsorption ability on Cu (Ⅱ), Pb (Ⅱ) and Cd (Ⅱ).
作者
谢页平
邱文婷
李莉
Yeping Xie;Wenting Qiu;Li Li(State Key Laboratory of Polymer Materials Engineering,Polymer Research Institute,Sichuan University, Chengdu 610065,China)
出处
《高分子材料科学与工程》
EI
CAS
CSCD
北大核心
2019年第3期124-130,共7页
Polymer Materials Science & Engineering
基金
国家自然科学基金国际(地区)合作交流项目(51720105012)
关键词
聚乙烯醇
超临界二氧化碳
贝壳粉
复合泡沫
结构调控
poly(vinyl alcohol)
supercritical carbon dioxide
shell powder
composite foam
structure adjusting
