丙烯酰胺-二氰二胺大单体及其与苯乙烯共聚物的研究(Ⅰ)——大单体及其共聚物的合成和表征

Studies on Acrylamide-Dicyanodiamide Macromer and Its Copolymer with Styrene (Ⅰ) --The Synthesis and Characterization of Macromer and Its Copolymer

通过丙烯酰胺、二氰二胺、甲醛及氯化铵的缩合反应,合成了分子链端含C=C双键的大单体,缩合过程用高压液相色谱考察,以AIBN为引发剂,二甲基亚砜为溶剂,使大单体与苯乙烯共聚,得到主链具有疏水性、侧链具有亲水性的共聚物,用GPC、IR光谱及溶解性对共聚物进行鉴定,苯乙烯含量较低时,共聚物溶于水,共聚物在MeOH/H_2O混合溶剂中的粘性行为表明它是带有疏水基团的聚电解质。

Acrylamide-dicyanodiamide macromer (M) is a condensation polymer of acrylamide, formaldehyde and dicyanodiamide with C=C as one of the end groups. The process of condensation was monitored by high-pressure liquid chromatography and C=C double bond was identified by 1H NMR. Molecular wight Mw of macromer was determined by SALLS method. Copolymer of the macromer with styrene P-M-St was prepared with AIBN as the initiator and DMSO as the solvent. The copolymer consists of hydrophobic groups along the main chain and the hydrophilic groups along the graft side chain. The graft copolymer was identified by GPC, IR spectrum and solubility-test. P-M-St with low content of styrene is water-soluble. Its charge density and degree of branching were determined by conductometric titration and its molecular weight Mw by using SALLS method. The viscosity behavior of P-M-St in MeOH/H2O shows that the copolymer is a polyelectrolyte containing hydrophobic groups.