Determination of ultra-low glass transition temperature via differential scanning calorimetry |
| |
Authors: | Lidong Feng Xinchao Bian Gao Li Zhiming Chen Yi Cui Xuesi Chen |
| |
Affiliation: | 1. Key Laboratory of Polymer Ecomaterials, Changchun Institute of Applied Chemistry, Chinese Academy of Sciences, Changchun 130022, Jilin, China;2. Zhejiang Hisun Biomaterials Co., Ltd., Taizhou 31800, Zhejiang, China |
| |
Abstract: | A novel method was developed to determine the ultra-low glass transition temperature (Tg) of materials through physical blending via differential scanning calorimetry. According to the Fox equation for polymer blends, a blend of two fully compatible polymers has only one Tg. The single Tg is a function of the Tgs of the two simple polymers. Thus, the ultra-low Tg of one material can be obtained from the Tgs of another polymer and their blends. The error of Tg measurements depends on the measurement error of the Tgs for the blends and another polymer. The method was successfully applied to determine the Tgs of acetyl tributyl citrate (ATBC), tributyl citrate (TBC) and poly(ethylene glycol)s (PEG)s with different molecular weights. The Tgs for ATBC, TBC, PEG-4000 and PEG-800 were ?57.0 °C, ?62.7 °C, ?76.6 °C and ?83.1 °C, respectively. For all the samples, the standard deviation of measurements was less than 3.3 °C, and the absolute error of measurements was theoretically not more than 5.3 °C. These results indicate that this method has acceptable precision and accuracy. |
| |
Keywords: | Poly(ethylene glycol) Glass transition Crystalline Polymer blending Compatibility |
本文献已被 ScienceDirect 等数据库收录! |
|