PHASE SEPARATION AND MICROVOID FORMATION AT PHASE INTERFACES OF HYDROPHOBIC-HYDROPHILIC POLYMER BLENDS DURING WET PROCESSING

In this paper,morphological structure,thermodynamic compatibility and relationship be-tween porosities and blend ratios of the wet coagulated PU/PVA sheets were studied by meansof observation of scanning electronic micrographies,tests of dynamic mechanical properties,moisture regain and vapor permeability.Furthermore,the formation of microvoids at interfacesof separated phases was discussed and a microvoid formation mechanism at phase interfaces ofhydrophobic-hydrophilic blends was suggested and compared with that ofhydrophobic-hydrophobic blends.

利用相分离制备透明超疏水纳米二氧化硅薄膜

以氨水为催化剂配制碱溶胶(Sol A),以盐酸为催化剂配制酸溶胶(Sol B),在酸、碱混合溶胶中添加聚丙烯酸(PAA)引发相分离,制备出高粗糙度的"沟-小山"形貌的透明薄膜,随后经过三甲基氯硅烷(TMCS)修饰,表面接触角达到151°,具有超疏水性能。

相分离对SiO_2薄膜粗糙度的影响

用氨水做催化剂配制碱溶胶,用盐酸做催化剂配制酸溶胶,在酸、碱混合溶胶中添加聚丙稀酸(PAA)引发相分离,通过添加不同含量的PAA,制备出具有不同粗糙度的透明薄膜,随后经过三甲基氯硅烷(TMCS)修饰,具有疏水性能和不同的疏水效果。