聚丙烯酰胺对半水硫酸钙晶须形貌稳定性的影响  

Influence of polyacrylamide on morphology stability of CaSO_4·0.5H_2O whiskers

作　　者：杨玉荣 张清杰 易美桂[1] 向兰[2] Yang Yurong;Zhang Qingjie;Yi Meigui;Xiang Lan(College of Chemical Engineering,Sichuan University,Chengdu610065,China;Department of Chemical Engineering,Tsinghua University)

机构地区：[1]四川大学化学工程学院,四川成都610065 [2]清华大学化学工程系

出　　处：《无机盐工业》2018年第12期13-16,共4页Inorganic Chemicals Industry

基　　金：国家自然科学基金项目(51774191);山西省煤基重点科技攻关项目(MC2014-06-01)

摘　　要：研究了使用聚丙烯酰胺对半水硫酸钙晶须进行表面改性,以提高晶须在水溶液中的形貌稳定性。通过扫描电镜(SEM)、X射线衍射(XRD)、红外光谱(FT-IR)等表征了晶须的性质。结果表明,聚丙烯酰胺添加量(以半水硫酸钙晶须质量计)由0增至2.0%时,晶须在水溶液中的形貌保持时间(长径比保持率大于80%)由0.5 h延长至4.0 h。聚丙烯酰胺以物理吸附(氢键)和化学吸附(形成—COO—Ca—键)两种模式吸附于半水硫酸钙晶须表面,由此降低晶须的表面能,提高晶须的形貌稳定性。Polyacrylamide(PAM)was used to modify the surface of hemihydrate calcium sulfate(CaSO4·0.5H2O)whiskers and to improve the morphology stability of whiskers in aqueous solution.The stabilized whiskers were characterized by scan ning electron microscopy(SEM),X-ray diffraction(XRD)and infrared spectrum(FT-IR),et al.The results showed that the addition of PAM(mass fraction of CaSO4·0.5H2O)increasing from0to2.0%prolonged the stabilization time of CaSO4·0.5H2O whiskers(slenderness ratio retention over80%)in aqueous solution from0.5h to4.0h.PAM was adsorbed on CaSO4·0.5H2O surface via physical(hydrogen bond)and chemical(-COO-Ca-bond)two routes,which reduced the surface energy and improved the morphology stability of CaSO4·0.5H2O whiskers.

关 键 词：聚丙烯酰胺 半水硫酸钙晶须 形貌稳定性 

分 类 号：TQ132.32[化学工程—无机化工]