Melting at alkyl side chain comb polymer interfaces
Melting at alkyl side chain comb polymer interfaces
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DOI：
10.1103/physrevlett.88.145501
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发表时间：
2002-04-08
影响因子：
8.6
通讯作者：
Dhinojwala, A
中科院分区：
文献类型：
--
作者：
Gautam, KS;Dhinojwala, A
利用红外可见和频产生（SFG）光谱研究了烷基侧链-丙烯酸酯梳状聚合物在空气和固体界面的结构和熔融转变温度。在空气界面处，SFG光谱显示出甲基带，并观察到两次转变：第一次发生在熔体温度T-m附近，第二次发生在熔体温度T-m以上10-20℃。烷基侧链越短，两者的转变温度差越大。与此相反，在蓝宝石界面上，在T-m （C18）附近观察到亚甲基带的单跃迁。
Infrared visible sum frequency generation (SFG) spectroscopy has been used to study structure and melting transition temperatures of alkyl-side chain-acrylate comb polymers at air and solid interfaces. At the air interface, the SFG spectra show methyl bands and two transitions are observed: the first, near the bulk melting temperature, T-m, and the second 10-20degreesC higher than T-m. The shorter the alkyl side chain, the larger the difference between the two transition temperatures. In contrast, methylene bands are observed at sapphire interface with a single transition near T-m (C18).