【作者】 王惟；

【导师】 汤嘉陵；

【作者基本信息】 四川大学 ， 材料学， 2007， 硕士

【摘要】 本文以甲苯二异氰酸酯(TDI)、聚丙二醇(PPG 3010)和环氧树脂(E-44)为主要原料制备聚氨酯／环氧树脂互穿网络聚合物乳液。红外分析显示样品中PU与EP各自的交联网络均已形成，且二者之间不存在化学键的结合。采用TEM直接观察样品的乳胶粒子形貌，PU／EP LIPN样品未呈现核壳结构，且与PU乳液空白样品的乳胶粒子形貌和尺寸基本一致，均为纳米级乳液。LIPN样品的粒度分析结果与TEM相吻合，表明LIPN样品中只存在一种乳胶粒子，就是两种组分共存于同一种乳胶粒子内，没有各自形成两种单组分的乳胶粒子。动态力学分析表明LIPN样品中两种组分完全互容且在分子尺度互穿，这一结果与DSC测试相符，本文成功制备了其乳胶粒子为非核壳结构的在分子尺度完全互穿互容的均相的PU／EP LIPN，且能在EP含量为5～50％的范围内任意调控EP的含量。产品在耐水性、耐溶剂性、热氧稳定性、力学性能及硬度等方面均表现出IPN特有的协同效应，印证了上述分析结果。但该LIPN随EP含量的增大乳液贮存稳定性变差，其机理尚不明确，有待进一步研究。更多还原

【Abstract】 The PU/EP LIPN was prepared using toluene diisocyanates (TDI), polypropylene glycol (PPG 3010) and epoxy resin (E-44) as the main materials in this paper. The chemical structure of the product was characterized by FT-IR. The result showed that respective networks of PU and EP have formed and lack of chemical bonds between PU and EP. TEM suggested that the emulsion particles of LIPN were not core-shell structure and the average particle size of LIPN and PU blank emulsion sample were around 110nm. The particle size analysis showed that both LIPN products and PU blank samples had nano-scale emulsion particles and narrow particle size distribution. The results showed two components of PU and EP coexisted on the same particle. The glass transition temperatures (Tg) of LIPN, PU and EP were investigated by DMA. The results indicated that two components of PU and EP have formed the interpenetrating polymer networks. The result was also well in the accordance with DSC analysis. The LIPN structure was also characterized by shear modulus of products by Davies equation. The experiment results showed that none core-shell structure, molecular scale interpenetrating and homogeneous LIPN was successfully synthesized by a new way of polymerization reaction, and the EP content could adjust randomly at range 5～50%. The properties of the PU/EP LIPN were measured in this experiment. The water resistance, solvent resistance, chemical resistance, thermo oxidative stability, mechanical property and hardness all showed obvious synergistic effect of IPN. The results showed these properties of LIPN had been obviously enhanced with the increase of the amount of epoxy resin. Although the properties of the LIPN were very excellent, the storage stability of the LIPN was reduced with the increasing of the EP content. The mechanism remains uncertain, and further studies are needed.更多还原