(太原理工大學 材料科學與工程學院，太原 030024)
摘 要: 對煅白表面錨固偶氮二氰基戊酸引發(fā)全氟烷基乙基丙烯酸酯(FM)聚合而制備的防吸濕煅白進行研究，利用XPS、IR、DSC、TG、SEM物理吸收和接觸角測量等方法對改性前后煅白的結(jié)構(gòu)、比表面積、形貌和疏水接觸角等進行表征，并分析改性后煅白吸濕性降低的原因和機理。結(jié)果表明：煅白表面發(fā)生了偶聯(lián)、錨固及聚合反應。錨固引發(fā)劑的煅白引發(fā)FM原位分散聚合而制得防吸濕煅白，其吸濕率隨FM質(zhì)量分數(shù)的增加而降低，當FM質(zhì)量分數(shù)達到7%時，吸濕率不再下降，改性后煅白1 h的吸濕率由1.39%下降到0.017%；聚全氟烷基乙基丙烯酸酯(PFM)的接枝率為0.5%、接枝效率為26.6%，煅白表面出現(xiàn)一層連續(xù)而完整的全氟聚合物膜，其厚度約為8 nm。
關鍵字: 煅白；偶氮二氰基戊酸；全氟烷基乙基丙烯酸酯；錨固；接枝聚合；吸濕
（College of Materials Science and Engineering, Taiyuan University of Technology, Taiyuan 030024, China）
Abstract:4,4''''-Azobis(4-cyanovaleric acid) (ACPA) was anchored onto the surface of calcined dolomite and radical graft polymerization of perfluoroalkylethyl acrylate (FM) from the modified calcined dolomite through dispersion polymerization were investigated. The structure, specific surface area, morphology and hydrophobic contact angle of calcined dolomite surface were characterised by XPS, IR, DSC, TG, SEM, physical absorption and contact angle measurement, and the reason and mechanism on the decreasing the moisture absorption rate of calcined dolomite after the modification were studied. The results show that the coupling, anchoring and polymerization reactions happen on the surface of calcined dolomite. Poly (Perfluoroalkylethyl acrylate) (PFM) is effectively grafted onto calcined dolomite through the initiation of anchored ACPA during in-situ dispersion polymerization. It shows that the moisture absorption rate of calcined dolomite decreases with increasing of the mass fraction of FM. When the mass fraction of FM is 7%, The moisture absorption rate decreases from 1.39% to 0.017% after modification for 1 h. The grafting rate and efficiency of PFA are 0.5% and 26.6%, respectively. The PFM/calcined dolomite composite particles have a continuous and complete layer of polymer membrane on the surface, and the thickness is about 8 nm.
Key words: calcined dolomite; 4,4''-Azobis(4-cyanovaleric acid); perfluoroalkylethyl acrylate; anchor; graft polymerization; moisture absorption
