含辣素衍生结构的疏水缔合共聚物的制备及性能

Synthesis and properties of hydrophobic associating copolymers containing capsaicin derived moieties

以微量(摩尔分数0.05%)辣素衍生单体N-(2-羟基-3-甲基丙烯酰胺-4,5-二甲基苄基)丙烯酰胺(HMMAM)为功能性单体,丙烯酰胺、4-丙烯酰吗啉、2-丙烯酰胺-2-甲基丙磺酸、甲基丙烯酸异冰片酯或甲基丙烯酸十八烷基酯为原料,采用无助溶剂的无皂乳液聚合方式共聚合成了新型疏水缔合共聚物PACIAM和PACSAM。采用FTIR、~1HNMR、TGA、SEM对其结构和形貌进行了表征,探讨了共聚物的疏水缔合特性、耐温耐盐性、溶解性及缓蚀性能。结果表明,PACIAM和PACSAM存在稳定的三维网状结构,对应的临界缔合浓度分别为4.5和4.0 g/L。质量浓度10 g/L的PACIAM和PACSAM溶液在30℃下表观黏度分别可达776和1224 m Pa·s,90℃下表观黏度保留率分别为37.57%和41.44%,在质量浓度为10 g/L的NaCl溶液中的表观黏度保留率分别为37.57%和42.12%。PACIAM和PACSAM溶解时间分别为25和27 min。质量浓度4 g/L的共聚物溶液的缓蚀效率可达96.76%和97.28%,微量HMMAM的引入大大增加了共聚物的各项性能。

New hydrophobic associating copolymers PACIAM and PACSAM were prepared by soap-free emulsion polymerization using trace(mole fraction 0.05%)capsaicin derived monomer N-[2-hydroxyl-3-acryl amino methyl-4,5-dimethylbenzyl]acrylamide(HMMAM)as functional monomer,and acrylamide,1-morpholinoprop-2-en-1-one,2-acrylamido-2-methylpropane sulfonic acid,isobornyl methacrylate or octadecyl methacrylate as raw materials.The structure and morphology of synthesized copolymers were characterized by FTIR,~1HNMR,TGA and SEM,followed by evaluation on hydrophobic association characteristics,temperature and salt resistance,solubility and corrosion inhibition.Characterization results indicated that both were in stable three-dimensional network structure.Performance evaluation data showed that,the critical association concentrations of PACIAM and PACSAM were 4.5 and4.0 g/L respectively with apparent viscosity at mass concentration of 10 g/L reached up to 776 and 1224m Pa·s at 30℃,which demonstrated improved hydrophobicity with HMMAM added.Moreover,influence of temperature on apparent viscosity retention rates displayed that PACIAM and PACSAM at 90℃still had corresponding apparent viscosity retention rates of 37.57%and 41.44%,indicating better temperature resistance.The dissolution time of PACIAM and PACSAM was 25 and 27 min,respectively.The corrosion inhibition efficiency of copolymer solutions at mass concentration 4 g/L could reach 96.76%and 97.28%.All these proved that introduction of trace HMMAM greatly enahnced the properties of copolymers.