Surface Properties and Structural Transformation Behaviors of mPEG-Maleic Rosin Copolymer in Water
Surface Properties and Structural Transformation Behaviors of mPEG-Maleic Rosin Copolymer in Water
复制标题
mPEG-马来酸松香共聚物在水中的表面性质和结构转变行为
DOI：
10.3390/polym9100466
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发表时间：
2017-09
期刊：
影响因子：
5
通讯作者：
Fuhou Lei
中科院分区：
文献类型：
--
作者：
Juying Zhou;Xia Zhang;Yanzhi Zhao;Haitang Xu;Pengfei Li;Hao Li;Jinyan Zhang;Qin Huang;Fuhou Lei
成功地制备了mPEG（单甲氧基聚乙二醇）-马来松香共聚物。用表面张力和共振散射技术研究了共聚物的表面性质。得到了临界胶束浓度（CMC）。描述了表面活性剂分子在空气-水界面的吸附行为和构象变化。吸附态1的吸附量随吸附量的增加呈正弦曲线变化，吸附态2的吸附量随吸附量的增加呈S形变化。吸附自由能比胶束化自由能更负，表面活性剂分子首先吸附在表面，饱和吸附后形成胶束。在此基础上，研究了不同浓度的mPEG-马来松香共聚物在水中随温度变化的结构转变和聚集行为。当浓度低于CMC时，随着温度的升高，mPEG-马来松香链经历了从单聚体到聚集体、到收缩聚集体、到内聚聚集体的转变。随着温度的降低，这个过程几乎是可逆的。当浓度高于CMC时，随着温度的升高，胶束向聚集体转变。通过动态光散射（DLS）和扫描电子显微镜（SEM）技术对这些现象进行了评估。
mPEG (monomethoxy poly(ethylene glycol))-maleic rosin copolymer was successfully prepared. The surface properties of the copolymer were investigated by surface tension and resonance scattering techniques. The critical micelle concentration (CMC) was obtained. The adsorption behaviors and the conformational changes of the surfactant molecules at the air-water interface were described. The adsorption amount of state 1 presented a sinusoid shape and that of state 2 presented a sigmoid with the growth of П. The free energy of adsorption is more negative than that of micellization, thus, the surfactant molecules adsorb on the surface firstly, and then form micelles after saturation adsorption. Accordingly, structural transformation and aggregation behaviors of various concentration mPEG-maleic rosin copolymers with changing temperature were explored in water. The mPEG-maleic rosin chains experienced transformation from unimers to aggregates, to contracted aggregates, to cohesive aggregates with increasing temperature when the concentration is lower than CMC. This process is almost reversible with decreasing temperature. Transformation from micelle to aggregate with increasing temperature happened when the concentration is higher than CMC. The phenomena were assessed by DLS (dynamic light scattering) and SEM (scanning electron microscopy) techniques.
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影响因子：
3.3
作者：
Makievski, AV;Fainerman, VB;Miller, R
通讯作者：
Miller, R
DOI：
10.1007/978-1-4899-0703-5_16
发表时间：
1992
期刊：
--
影响因子：
--
作者：
W. Gombotz;G. Wang;T. Horbett;A. Hoffman
通讯作者：
W. Gombotz;G. Wang;T. Horbett;A. Hoffman
DOI：
10.1002/pola.1989.080271204
发表时间：
1989-11
期刊：
Journal of Polymer Science Part A
影响因子：
--
作者：
B. Wesslén;K. Wesslén
通讯作者：
B. Wesslén;K. Wesslén
DOI：
10.1159/000233309
发表时间：
1983-01-01
期刊：
INTERNATIONAL ARCHIVES OF ALLERGY AND APPLIED IMMUNOLOGY
影响因子：
--
作者：
RICHTER, AW;AKERBLOM, E
通讯作者：
AKERBLOM, E
影响因子：
5.8
作者：
Avgoustakis, K;Beletsi, A;Ithakissios, DS
通讯作者：
Ithakissios, DS