On the thermogravimetric analysis of polymers: Polyethylene oxide powder and nanofibers
On the thermogravimetric analysis of polymers: Polyethylene oxide powder and nanofibers
复制标题
聚合物的热重分析：聚环氧乙烷粉末和纳米纤维
DOI：
10.1002/app.52055
复制
发表时间：
2021
影响因子：
3
通讯作者：
Chipara, Mircea
中科院分区：
文献类型：
--
作者：
Omosola, Oriretan;Chipara, Dorina Magdalena;Uddin, Mohammad;Lozano, Karen;Alcoutlabi, Mataz;Padilla, Victoria;Chipara, Mircea
使用不同的理论模型（如Friedman和Flynn-Wall-Ozawa）研究了聚环氧乙烷（通过强制纺丝聚环氧乙烷的水或氯仿溶液获得的粉末和纳米纤维）的热重分析。提出了一种半经验的方法来估算热降解的“S形活化能”，并通过PEO粉末和纳米纤维垫的实验数据得到了证实。该方程允许使用单个加热速率从单个热谱图计算“S形活化能”，而不需要热降解过程中涉及的实际复杂化学反应集的任何模型。对于PEO（从水溶液获得的粉末和纳米纤维），“S形活化能”随着加热速率的增加而增加。从氯仿溶液中得到的PEO垫的S形活化能表现出小的下降，随着加热速率的增加。拟合热谱图的导数以确定拐点的坐标。将“S形活化能”与从Flynn-Wall-Ozawa模型确定的活化能进行比较。讨论了聚氧化乙烯粉末和从水溶液中获得的纳米纤维的热降解之间的相似性。从水和氯仿溶液中获得的垫的S形活化能之间的显着差异的报道。
Thermogravimetric analysis of polyethylene oxide (powder and nanofibers obtained by force spinning water or chloroform solutions of polyethylene oxide) was studied using different theoretical models such as Friedman and Flynn‐Wall‐Ozawa. A semiempirical approach for estimating the “sigmoid activation energy” from the thermal degradation was suggested and confirmed by the experimental data on PEO powder and nanofibers' mats. The equation allowed for calculating a “sigmoid activation energy” from a single thermogram using a single heating rate without requiring any model for the actual complex set of chemical reactions involved in the thermal degradation process. For PEO (powder and nanofibers obtained from water solutions), the “sigmoid activation energy” increased as the heating rate was increased. The sigmoid activation energy for PEO mats obtained from chloroform solutions exhibited a small decrease as the heating rate was increased. Thermograms' derivatives were fitted to determine the coordinates of the inflection points. The “sigmoid activation energy” was compared to the activation energy determined from the Flynn‐Wall‐Ozawa model. Similarities between the thermal degradation of polyethylene oxide powder and of the nanofibers obtained from water solutions were discussed. Significant differences between the sigmoid activation energies of the mats obtained from water and chloroform solutions were reported.
登录
查看更多内容
影响因子：
5.9
作者：
Chipara, Magdalena;Lozano, Karen;Chipara, Mircea
通讯作者：
Chipara, Mircea
光响应接枝共聚物的合成、表征及热降解动力学
影响因子：
3.3
作者：
F. Bezgin;K. Demirelli
通讯作者：
K. Demirelli
碳纳米纤维对聚环氧乙烷热物理行为的影响
影响因子：
3
作者：
A. Adhikari;K. Lozano;M. Chipara;J. Qualls
通讯作者：
J. Qualls
DOI：
--
发表时间：
2009
期刊：
影响因子：
--
作者：
S. Oh;W. Kwon;S. Kim
通讯作者：
S. Kim
直接熔融共混聚甲基丙烯酸甲酯/海泡石纳米复合材料的热稳定性和降解动力学
DOI：
--
发表时间：
2013
期刊：
影响因子：
--
作者：
N. Huang;Zhijun Chen;Hao Liu;Jianqi Wang
通讯作者：
Jianqi Wang