本文選題：環(huán)氧　切入點(diǎn)：超支化聚合物　出處：《北京化工大學(xué)》2016年碩士論文　論文類(lèi)型：學(xué)位論文

【摘要】：環(huán)氧材料具有優(yōu)異的力學(xué)、熱學(xué)和電學(xué)性能,因而被廣泛用于各個(gè)領(lǐng)域；但其不足的沖擊韌性限制了其應(yīng)用。它在涂料中用量很大,但在耐酸堿性和固化收縮方面還有待進(jìn)一步提高。為了改善以上不足,設(shè)計(jì)合成了三種超支化聚合物,并將其應(yīng)用于改性雙酚A型環(huán)氧樹(shù)脂,制備高性能環(huán)氧結(jié)構(gòu)材料和功能防腐材料。以1,4-丁二醇二縮水甘油醚(A2)、三酚基甲烷(B3)和高活性端酚羥基四官能度單體(B4)為原料,分別用A2+B3和A2+B4法合成了兩種超支化分子(HBP3和HBP4),研究了反應(yīng)條件(如溶劑種類(lèi)、單體投料比、反應(yīng)溫度和反應(yīng)時(shí)間)對(duì)產(chǎn)物相對(duì)分子量及其分布的影響,并對(duì)其結(jié)構(gòu)進(jìn)行表征。把超支化環(huán)氧HBP4添加到E51/甲基納迪克酸酐體系中進(jìn)行增韌改性。當(dāng)添加量為5%時(shí),力學(xué)和熱學(xué)性能達(dá)到最優(yōu),使得拉伸性能和沖擊性能分別提高了26.3%和36.4%,Tg提高9.1℃。用幾種無(wú)模型動(dòng)力學(xué)方法分析了升溫固化數(shù)據(jù),發(fā)現(xiàn)添加HBP4可降低體系的活化能。將HBP4引入到E51/NX-2007涂料體系中,在未影響噴涂工藝的條件下制備出了高固含涂層,使得漆膜的硬度、附著力、沖擊強(qiáng)度和耐介質(zhì)性均有大幅度提高。以4,4’-二氟二苯砜(A2)、三羥甲基丙烷(B3)和3-甲基-3-羥甲基氧雜環(huán)丁烷制備超支化氧雜環(huán)丁烷POXEM,并對(duì)其結(jié)構(gòu)進(jìn)行表征。將POXEM作為改性劑,添加到E51/三氟化硼乙胺固化體系中,材料的Tg提高12℃,沖擊性能提高22.8%。
[Abstract]:Epoxy materials are widely used in various fields because of their excellent mechanical, thermal and electrical properties, but their low impact toughness limits their application. In order to improve the acid-alkali resistance and curing shrinkage, three kinds of hyperbranched polymers were designed and synthesized and applied to the modified bisphenol A epoxy resin. High performance epoxy structural materials and functional anticorrosive materials were prepared. Two hyperbranched molecules, HBP3 and HBP4, were synthesized by A2B 3 and A2 B 4 methods respectively. The effects of reaction conditions (such as solvent type, monomer feed ratio, reaction temperature and reaction time) on the relative molecular weight and distribution of the product were studied. The hyperbranched epoxide HBP4 was added to the E51 / methyl-Nadidic anhydride system for toughening and modification. When the addition amount was 5, the mechanical and thermal properties were optimized. The tensile and impact properties were increased by 26.3% and 36.4Tg, respectively. The curing data were analyzed by several model-free kinetic methods. It was found that the activation energy of the system could be reduced by adding HBP4. HBP4 was introduced into the E51 / NX-2007 coating system. The high solid coating was prepared without affecting the spraying process, which made the film hardness and adhesion. The impact strength and dielectric resistance of hyperbranched oxybutane POXEMs were characterized by the preparation of hyperbranched oxybutane POXEMs using 4H4 (4-difluorodiphenylsulfone), trihydroxymethylpropane (B3) and 3-methyl-3-hydroxymethyl oxyoxyoxyoxybutane (3methyl-3-hydroxymethyl oxyoxybutane) as modifiers, and the structure of POXEMs was characterized by using POXEM as modifier. The TG of E51 / E3F3 curing system was increased by 12 鈩，

本文編號(hào)：1639753