以季戊四醇为核分子的支化CPAM的制备及其增强效果

Preparation of Branched Cationic Polyacrylamide with PETL as Nuclear and Its Application as Paper Strengthening Agent

关键词:  支化阳离子聚丙烯酰胺  季戊四醇  阳离子单体  纸张增强

Key Words:branched cationic polyacrylamide (BCPAM)  pentaerythritol (PETL)  diallyl dimethyl ammonium chloride(DADMAC)  paper strengthening

摘要:以季戊四醇（PETL）为聚合反应的支化剂,硝酸铈铵为引发剂,选用二甲基二烯丙基氯化铵(DADMAC)为阳离子单体,丙烯酰胺（AM）为单体，通过自由基聚合反应制备支化阳离子聚丙烯酰胺(BCPAM)；利用红外光谱、13C-NMR核磁共振谱对所合成的产物结构进行了表征；研究引发剂的用量、阳离子单体用量对产物特性黏度的影响；以BCPAM作为纸张增强剂,研究其对纸张强度性能的影响。研究结果表明,所合成的产物为BCPAM；引发剂及阳离子单体用量因影响产物相对分子质量或分子链的形态而影响其特性黏度；BCPAM对纸张增强作用显著,当其用量为0.5%时(对绝干浆),纸张的抗张指数提高了40.6%,撕裂指数提高了27.6%,耐破指数提高了12.6%。

Abstract:Branched cationic polyacrylamide (BCPAM) was synthesized via free-radical solution polymerization of acrylamide (AM) and diallyl dimethyl ammonium chloride (DADMAC) by using pentaerythritol (PETL) as the core molecule and ceric ammonium nitrate (Ce4+) as the initiator. The structure of the resulting product BCPAM was characterized by FT-IR and 13C-NMR. The effects of initiator dosage and cationic monomer concentration on the intrinsic viscosity of the product were investigated, and the application of BCPAM as paper strengthening agent was studied. The result indicated that initiator dosage and cationic monomer concentration influenced the molecular weight and molecular chain of the product, therefore also influenced the intrinsic viscosity. BCPAM had significant paper strengthening performance; the dry tensile index, tear index and burst index of the hand sheet were increased by 40.6%, 27.6% and 12.6% respectively when the dosage of BCPAM was 0.5% (based on O.D. pulp).