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Polymers 2017, 9(10), 466; https://doi.org/10.3390/polym9100466

Surface Properties and Structural Transformation Behaviors of mPEG-Maleic Rosin Copolymer in Water

1,2,3,* , 1
,
1,2
,
1,2,3
,
1,2
,
1,2
,
1
,
1,2,3
and
1,2
1
School of Chemistry and Chemical Engineering, Guangxi University for Nationalities, Nanning 530006, China
2
Guangxi Key Laboratory of Chemistry and Engineering of Forest Products, School of Chemistry and Chemical Engineering, Guangxi University for Nationalities, Nanning 530006, China
3
Key Laboratory of Guangxi Colleges and Universities for Food Safety and Pharmaceutical Analytical Chemistry, School of Chemistry and Chemical Engineering, Guangxi University for Nationalities, Nanning 530006, China
*
Author to whom correspondence should be addressed.
Received: 18 August 2017 / Revised: 12 September 2017 / Accepted: 15 September 2017 / Published: 21 September 2017
View Full-Text   |   Download PDF [2456 KB, uploaded 21 September 2017]   |  

Abstract

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. View Full-Text
Keywords: mPEG-maleic rosin copolymer; surface property; structural transformation; aggregation mPEG-maleic rosin copolymer; surface property; structural transformation; aggregation
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).
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Zhou, J.; Zhang, X.; Zhao, Y.; Xu, H.; Li, P.; Li, H.; Zhang, J.; Huang, Q.; Lei, F. Surface Properties and Structural Transformation Behaviors of mPEG-Maleic Rosin Copolymer in Water. Polymers 2017, 9, 466.

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