【摘要】 通过辐照接枝法在高密度聚乙烯(HDPE)上引入磺酸基团;从而制备了一种强酸性阳离子交换膜。就所制备离子交换膜的热稳定及化学稳定性能进行了详细考察。结果表明;接枝膜上引入磺酸基团后抗氧化性能较仅含羧酸基团的离子交换膜有所提高;接枝膜的热稳定性较之接枝前稍差;热重分析表明;接枝后样品的成碳量较接枝前有相当大的提高;原因归结于表面接枝层对成碳过程有促进作用。由于接枝膜中HDPE组份的“结晶破坏”及接枝链对晶区的“稀释作用”综合影响;结晶度随着接枝率的升高而降低。更多还原

【Abstract】 Strong acid cation-exchange membranes were obtained by irradiation grafting of acrylic acid (AA) and sodium styrene sulfonate (SSS) onto high-density polyethylene (HDPE). Thermal and chemical stability of the cation-exchange membranes was investigated. The effectiveness of sulfonate-containing films was conformed in inducing high resistance to oxidative degradation. Thermal stability of the grafted HDPE was weaker than HDPE as detected by TGA analyzing technique. Char residue by TGA of the grafted HDPE is greater than that of HDPE. It shows that the branch chains including –SO3Na and –COOH was grafted onto the backbone of HDPE, and thus give a catalytical impetus to the charring. Crystallinity of the grafted membranes decreased with increasing grafting yield of the membrane samples. Is is supposed that the decreased crystallinity is due to collective effects of the inherent crystallinity dilution by the amorphous grafted chains and disruption of spherulitic crystallites of the HDPE component.更多还原