GLASS RUBBER TRANSITIONS OF CELLULOSIC POLYMERS BY DYNAMIC MECHANICAL ANALYSIS
GLASS RUBBER TRANSITIONS OF CELLULOSIC POLYMERS BY DYNAMIC MECHANICAL ANALYSIS
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通过动态力学分析研究纤维素聚合物的玻璃橡胶转变
DOI：
10.1002/jps.2600790922
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发表时间：
1990-09-01
影响因子：
3.8
通讯作者：
NEEDHAM, TE
中科院分区：
文献类型：
--
作者：
KARARLI, TT;HURLBUT, JB;NEEDHAM, TE
用动态力学分析（DMA）测定了几种纤维素聚合物[羟丙基甲基纤维素（HPMC）、羟丙基纤维素（HPC）、羟乙基纤维素（HEC）]的玻璃化转变温度（Tg）。使用热台熔点装置检测上述聚合物的熔融温度。三种不同等级的HPMC（3、6和15cps）的初始Tg分别测定为160、170和175 ° C。HEC膜的初级Tg测定为120 ° C。HPC膜未显示出初级Tg。这些纤维素聚合物也表现出二次转变。分别在225至254 ° C和190至195 ° C下观察到HPMC和HPC的热阶段熔融。HEC粉末没有表现出熔融温度，但在> 150 ° C的温度下变得更暗。
The glass–rubber transition temperatures (Tg) of several cellulosic polymers [hydroxypropyl methylcellulose (HPMC), hydroxypropyl cellulose (HPC), hydroxyethyl cellulose (HEC)] have been examined using dynamic mechanical analysis (DMA). The melting temperatures of the above polymers were examined using a hot stage melting point apparatus. The primary Tgof three different grades of HPMC (3, 6, and 15 cps) were determined to be 160, 170, and 175 °C, respectively. The primary Tgof the HEC film was determined as 120 °C. The HPC film did not indicate a primary Tg. These cellulosic polymers also displayed secondary transitions. Hot stage melting of HPMC and HPC was observed at 225 to 254 °C and 190 to 195 °C, respectively. The HEC powder did not exhibit a melting temperature, but became darker at temperatures >150 °C.