【摘要】 <正> 苯乙烯（St）与丙烯酸丁酯（BA）制成的共聚物树脂是常用的涂料之一,其特性取决于共聚物的组成,改变配方的组成可有效地控制涂层的硬度、柔韧性、冲击强度、保光保色以及抗水抗油等性能。作为苯乙烯的定量峰,可采用700cm^-1和1600cm^-1吸收峰。前者系单取代苯环CH面外弯曲振动吸收,后者为苯环伸缩振动吸收。我们的实验表明,1600cm^-1吸收峰比之700cm^-1峰更适用于苯乙烯的定量。作为丙烯酸丁酯的定量峰,可选用表征酯羰基伸缩振动的1733cm^-1吸收峰。用薄膜法制样和吸光度比的方法,可定量测定共聚物的组成,并根据测定结果计算两单体的竞聚率。更多还原

【Abstract】 The composition of styrene （St） -Butylacrylate（BA） was determined by IR spectroscopy. The 1733 cm^-1 band was selected as key band for measuring the BA component, and the 1600 cm^-1 band as key band for measuring the St component. It is suggested that a reasonably accurate estimate of components would be given by the equation:C_BA/C_St= 0.06298[(D₁₇₃₃/D₁₆₀₀) -0.8183]. This method is more accurate and rapid. It is more convenient to measure the copolymer composition by this method. The monomer reactivity ratios for copolymerization of St-BA system have been determined to be r_st= 0.84 and r_BA= 0.22 at 70℃.更多还原