碳纳米管表面修饰/有机氟改性聚氨酯-丙烯酸酯的制备与性能

Preparation and Properties of Carbon Nanotube Surface Modification/Organic Fluorine Modified Polyurethane-Acrylate

摘要:

以多巴胺(DOA)在弱碱性体系下氧化自聚反应和γ-氨丙基三乙氧基硅烷(APTES)水解缩合反应协同修饰碳纳米管(CNTs)，获得了A-DOA/CNTs材料；再以异佛尔酮二异氰酸酯(IPDI)、聚碳酸酯多元醇(PCDL)、二羟甲基丁酸(DMBA)、季戊四醇三丙烯酸酯(PETA)合成了双键半封端的聚氨酯预聚体，利用体系中剩余的异氰酸酯基与修饰后CNTs表面活性基团发生共价缩聚并交联，最终与有机氟等乙烯基类单体进行乳液共聚反应，制备出A-DOA/CNTs改性FPUA复合乳液。经检测得出结论如下：当A-DOA/CNTs用量为0.75%时，有机氟单体用量为12%时，A-DOA/CNTs/FPUA复合胶膜在热失重为10%时，热分解温度为329℃，相比PUA胶膜热分解温度为292℃时提高了37℃，此时，复合胶膜在-55℃时的动态储能模量E′为最大值，玻璃化温度Tg为83℃，显著改善了胶膜的热稳定性，此时，A-DOA/CNTs/FPUA胶膜的吸水率为5.2%，水接触角为103.1?，其拉伸强度为23.3MPa，断裂伸长率为352%，综合性能为最佳。

Abstract:

A-DOA/CNTs materials were obtained by synergistic modification of carbon nanotubes (CNTs) with dopamine (DOA) in a weakly basic system by oxidative self-polymerization and γ-aminopropyltriethoxysilane (APTES) hydrolysis and condensation reaction. Polyurethane prepolymer with double bond and semi-blocked end was synthesized by isophorone diisocyanate (IPDI), polycarbonate polyol (PCDL), Dihydroxymethyl butyric acid (DMBA), pentaerythritol triacrylate (PETA). The A-DOA/CNTs modified FPUA composite emulsion was prepared by emulsion copolymerization of vinyl monomers such as organic fluorine and other residual isocyanate groups and covalent polycondensation and crosslinking of the modified CNTs surface active groups. The results are as follows: When the amount of A-DOA/CNTs is 0.75% and the amount of organic fluorine monomer is 12%, the thermal decomposition temperature of A-DOA/CNTs/FPUA composite film is 329?C when the thermal weight loss is 10%. Compared with the thermal decomposition temperature of PUA film, the thermal decomposition temperature of PUA film is 292?C, and 37?C is increased. At this time, the dynamic storage modulus of composite film at -55?C is the best value, and the glass transition temperature is 83?C, which significantly improves the thermal stability of the film. The water absorption of A-DOA/CNTs/FPUA film is 5.2%, the water contact angle is 103.1? , the tensile strength is 23.3 MPa, the elongation at break is 352%, and the comprehensive performance is the best.