Estimation of the adsorption state of nonionic emulsifier molecules onto styrene–methacrylic acid copolymer particles by in situ 1H NMR measurements
Estimation of the adsorption state of nonionic emulsifier molecules onto styrene–methacrylic acid copolymer particles by in situ 1H NMR measurements
复制标题
通过原位 1H NMR 测量估计非离子乳化剂分子在苯乙烯-甲基丙烯酸共聚物颗粒上的吸附状态
DOI：
10.1007/s00396-002-0650-y
复制
发表时间：
2002
影响因子：
2.4
通讯作者：
N. Fukami
中科院分区：
文献类型：
--
作者：
M. Okubo;Toyoko Suzuki;R. Shinohara;N. Fukami
在室温下，用核磁共振（NMR）测量了聚氧乙烯壬基苯基醚非离子乳化剂分子对分散在D2O中的聚苯乙烯（PS）和苯乙烯-甲基丙烯酸共聚物[P(S-MAA)]颗粒的吸附行为。乳化剂分子的质子共振仅被观察到。在一定浓度的乳化剂下，随着分散在体系中的PS颗粒总表面积的增加，疏水性基团（壬基和苯基）和亲水性基团聚氧乙烯链上质子的共振归一化核磁共振积分减小。疏水基团的下降幅度远大于亲水基团。在P（S-MAA）颗粒分散体系中，颗粒表面的羧基离子化降低了乳化剂的吸附量。
The adsorption behavior of poly(oxyethylene) nonyl phenyl ether nonionic emulsifier molecules onto polystyrene (PS) and styrene–methacrylic acid copolymer [P(S-MAA)] particles dispersed in D2O was evaluated by in situ1H NMR measurements at room temperature. The resonance due to the protons of the emulsifier molecules was only observed. Normalized NMR integrals of the resonance due to the protons of hydrophobic groups (nonyl and phenyl groups) and the hydrophilic group, poly(oxyethylene) chain, at a certain concentration of the emulsifier decreased with an increase in the total surface area of the PS particles dispersed in the system. The decrease for the hydrophobic groups was much larger than that for the hydrophilic groups. In the dispersion system of P(S-MAA) particles, ionized carboxyl groups at the particle surface decreased the amount of the emulsifier adsorbed.