Synthesis of AB2 star-shaped miktoarm copolymers and their crystallization behavior |
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Authors: | Kangcheng Wang Wei Huang Yongfeng Zhou Deyue Yan |
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Institution: | (1) School of Chemistry and Chemical Engineering, Shanghai Jiao Tong University, Shanghai, 200240, China;(2) Department of Chemistry, Huzhou Teachers College, Huzhou, 313000, China |
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Abstract: | A small molecule (GMS-SA2) with one alkyl chain and two terminal carboxyl groups was synthesized successfully by the reaction of glyceryl monostearate
(GMS) with excess succinic anhydride (SA). Then, GMS-SA2 was used as a coupling agent to condensate with polyethylene glycols (PEG) of different molecular weight or polyethylene
glycol monomethyl ether (PEGm) in the presence of stannous octoate as catalyst and diphenyl ether as azeotropic agent. The
AB2 star-shaped miktoarm copolymers were obtained successfully and were characterized by 1H-NMR, DSC, GPC, XRD, FTIR and polarizing microscopy. The results of DSC and XRD measurements indicate that the crystallization
temperature and the melting temperature of the AB2 star-shaped miktoarm copolymers are different from those of the corresponding linear PEGs, because the existing of GMS-SA2 alters their crystalline growth velocity and the perfect degree of crystals. It is very important to control the crystal
morphology of star-shaped copolymers by introducing the miktoarm into the starshaped polymers and adjusting its content in
star-shaped polymers.
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Translated from Chemical Journal of Chinese Universities, 2007, 28(7): 1365–1370 译自: 高等学校化学学报] |
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Keywords: | star-shaped polymer miktoarm glyceryl monostearate polyethylene glycol crystallization |
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