Tianjin Key Laboratory of Composite and Functional Materials, and School of Materials Science and Engineering, Tianjin University, Tianjin 300072, China
zhe.ma@tju.edu.cn
收稿:2022-06-17,
修回:2022-7-13,
录用:2022-7-30,
网络首发:2022-10-10,
纸质出版:2023-03-01
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Lou, Y. H.; Li, W.; Qv, C. J.; Ma, Z. Enhanced phase transition in poly(ethylene glycol) grafted butene-1 copolymers. Chinese J. Polym. Sci. 2023, 41, 414–421
Ya-Hui Lou, Wei Li, Chun-Jing Qv, et al. Enhanced Phase Transition in Poly(ethylene glycol) Grafted Butene-1 Copolymers[J]. Chinese Journal of Polymer Science, 2023, 41(3): 414-421.
Lou, Y. H.; Li, W.; Qv, C. J.; Ma, Z. Enhanced phase transition in poly(ethylene glycol) grafted butene-1 copolymers. Chinese J. Polym. Sci. 2023, 41, 414–421 DOI: 10.1007/s10118-022-2850-x.
Ya-Hui Lou, Wei Li, Chun-Jing Qv, et al. Enhanced Phase Transition in Poly(ethylene glycol) Grafted Butene-1 Copolymers[J]. Chinese Journal of Polymer Science, 2023, 41(3): 414-421. DOI: 10.1007/s10118-022-2850-x.
A series of polyethylene glycol grafted polybutene-1 copolymers with the elevated crystallization temperature and the rapid phase transition were designed and synthesized. The kinetics of phase transition presents a non-monotonic trend with increasing branch density and branch length.
In the present work
a series of poly(ethylene glycol) grafted polybutene-1 copolymers (PB-
g
-PEG) were designed and successfully synthesized with reaction intermediate method
of which the branch densities and length could be tuned independently. The branch density varied from 0.39 mol% to 1.23 mol% and the branch length was tuned by employing PEG number-averaged molecular weight (
M
n
) from 350 Da to 750 Da and 1000 Da. The non-isothermal crystallization and phase transition behaviors of these butene-1 copolymers with varying branches were systematically explored by differential scanning calorimeter. The results first showed that compared with the linear polybutene-1 homopolymer
presence of steric 4-[4-(trimethylsilylalkynyl)-phenyl]-1-butene (TMS) groups suppressed crystallization and phase transition of copolymers. Interestingly
the introduction of long poly(ethylene glycol) (PEG) branches with
M
n
=350−1000 Da not only elevated the peak temperature of the non-isothermal crystallization but also enhanced the II-I phase transition
with respect to copolymers with TMS groups. Furthermore
the quantitative correlations between phase transition kinetics with the branch parameters (density and length) were explored. It was found that the phase transition presents a non-monotonic trend with increasing branch density and branch length. In this case
the optimal branch density and length obtained were 0.77 mol% and 750 Da
respectively. Employing the small angle X-ray scattering and transmission electron microscopy
a direct correlation between the phase transition kinetics and the long periodicity of separated phase was obtained
which may be due to the increased internal stress and facilitated stress transport.
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