Key Laboratory of Automobile Materials, Ministry of Education (Jilin University), School of Materials Science and Engineering, Jilin University, Changchun 130022, China.
Phys Chem Chem Phys. 2019 Feb 27;21(9):5224-5231. doi: 10.1039/c8cp07267a.
Based on a thermodynamic approach, glass transition temperature (Tg) of substrate-supported polymer nanofilms (s-PNFs) is investigated for carbon-chain polymers, taking the role of the interface energy into consideration. Relative to the Tg depression, originating from the positive interface energy due to the weak interfacial van der Waals interactions, the Tg raise is reversely induced by the negative interface energy, induced by the hydrogen bonds formed between the side-chains of polymers and the surface hydroxyl groups of substrates. Moreover, the Tg raise can be reinforced for s-PNFs with simple side-chains. The model predictions agree well with available experimental or simulation results.
基于热力学方法，考虑界面能的作用，研究了支撑在基底上的聚合物纳米薄膜（s-PNFs）的玻璃化转变温度（Tg）对于碳链聚合物的影响。相对于由于弱界面范德华相互作用而产生正界面能导致的 Tg 降低，负界面能（由聚合物侧链和基底表面羟基之间形成的氢键引起）会导致 Tg 升高。此外，具有简单侧链的 s-PNFs 的 Tg 升高可以得到增强。模型预测与现有的实验或模拟结果吻合较好。
