Unusual Thermal Properties of Certain Poly(3,5-disubstituted styrene)s
Unusual Thermal Properties of Certain Poly(3,5-disubstituted styrene)s
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某些聚(3,5-二取代苯乙烯)的异常热性能
DOI:
10.1021/acs.macromol.0c00163
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发表时间:
2020
期刊:
影响因子:
5.5
通讯作者:
Ellison, Christopher J.
中科院分区:
文献类型:
--
作者:
Koh, Jai Hyun;Zhu, Qingjun;Asano, Yusuke;Maher, Michael J.;Ha, Heonjoo;Kim, Sung-Soo;Cater, Henry L.;Mapesa, Emmanuel U.;Sangoro, Joshua R.;Ellison, Christopher J.
During the course of studying silicon-containing diblock copolymers, it was discovered that poly(3,5-di(trimethylsilyl)styrene)-block-poly(3,4-methylenedioxystyrene) (PDTMSS-b-PMDOS) showed very unusual thermal properties. The material can be recovered as a free-flowing powder despite heating above 250 °C. To better understand this behavior, homopolymers of the 3,5-disubstituted styrenes, poly(3,5-di(trimethylsilyl)styrene) (PDTMSS) and poly(3,5-di-tert-butylstyrene) (PDtBS), were prepared. These polymers are soluble in common organic solvents and formed clear, glassy thin films upon spin coating. These homopolymers were studied by differential scanning calorimetry (DSC), broadband dielectric spectroscopy (BDS), dynamic mechanical analysis (DMA), and temperature-programmed ellipsometry. These experiments document the lack of a conventional glass transition in these materials below their decomposition temperature. A series of statistical copolymers of PDTMSS and PDtBS with styrene was synthesized and studied by DSC in an attempt to establish theTgof the homopolymers by model-based extrapolation.
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影响因子:
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作者:
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通讯作者:
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发表时间:
2004
期刊:
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