ζ-POTENTIAL OF ETHYLENE-VINYL ALCOHOL COPOLYMERS
ζ-POTENTIAL OF ETHYLENE-VINYL ALCOHOL COPOLYMERS
复制标题
乙烯-乙烯醇共聚物的 z-电势
DOI：
10.2115/fiber.30.12_t559
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发表时间：
1974
期刊：
影响因子：
--
通讯作者：
Keizo Nonaka
中科院分区：
文献类型：
--
作者：
Tsunetaka Matsumoto;K. Nakamae;Yoshito Nakano;Keizo Nonaka
为了研究乙烯-乙烯醇（伊娃）和乙烯-醋酸乙烯酯共聚物（EVAc）的表面化学性质与共聚物组成的关系，用流动电位法测定了伊娃和EVAc的表面电位，结果表明：1）热处理后的聚乙烯（PE）和聚乙烯醇（PVA）的表面电位分别为-155mV和-35mV;伊娃和EVAc的静电势与其吸水性密切相关。2）伊娃的静电势与其VA含量密切相关，且不随VA含量的增加而逐渐变化。但当VA含量为40mol%时，化学性质由PE转变为PVA; 3）EVAc的电子转移电位由PE迅速下降到PVAc，直到VA含量为21mol%时，EVAc变为无定形;从表面能，特别是氢键力分量和对溶液中OH-离子的吸附能力出发，解释了伊娃和EVAc的表面电位与共聚物组成的关系。
To clarify the relationship between the surface chemical properties of ethylene-vinyl alcohol (EVA) or ethylene-vinyl acetate copolymer (EVAc) and copolymer composition, the ζ-potentials of EVA and EVAc were measured by using the streaming-potential method.The following results were obtained:1) The ζ-potentials of heat treated polyethylene (PE) and polyvinyl alcohol (PVA) are -155mV, -35mV respectively. The ζ-potentials of EVA and EVAc are closely related to its water adsorption.2) The ζ-potentials of EVA closely depend upon its VA content and do not change gradually, but give a sudden turn of chemical properties from that of PE to that of PVA at about VA 40 mol%.3) The ζ-potential of EVAc decreases rapidly from that of PE to that of PVAc until EVAc becomes amorphous at about 21 mol%.4) The relationships between the ζ-potentials of EVA and EVAc and copolymer composition are explained on the basis of the surface energy, especially the hydrogen bonding force component and the adsorption ability of OH- ions from solution phase.