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.
Ellison, Christopher J.
中科院分区:
化学1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.

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在研究含硅二嵌段共聚物的过程中,发现聚(3,5-二(三甲基硅基)苯乙烯)-嵌段-聚(3,4-亚甲基二氧基苯乙烯)(PDTMSS-b-PMDOS)具有非常特殊的热性能。尽管加热到250 °C以上,该材料仍可以作为自由流动的粉末回收。为了更好地理解这种行为,制备了3,5-二取代苯乙烯的均聚物,聚(3,5-二(三甲基甲硅烷基)苯乙烯)(PDTMSS)和聚(3,5-二叔丁基苯乙烯)(PDtBS)。这些聚合物可溶于普通的有机溶剂,并在旋涂时形成透明的玻璃状薄膜。这些均聚物进行了研究,通过差示扫描量热法(DSC),宽带介电谱(BDS),动态力学分析(DMA),和程序升温椭圆偏振。这些实验证明了这些材料在低于其分解温度下缺乏常规的玻璃化转变。合成了一系列PDTMSS和PDtBS与苯乙烯的统计共聚物,并通过DSC研究,试图通过基于模型的外推来建立均聚物的Tg。
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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