Characterization of cured polysulfide polymers by thermal degradation: Pyrolysis‐GC and thermogravimetric studies
Characterization of cured polysulfide polymers by thermal degradation: Pyrolysis‐GC and thermogravimetric studies
复制标题
DOI：
10.1002/app.1987.070340517
复制
发表时间：
1987-10
影响因子：
3
通讯作者：
T. S. Radhakrishnan;M. Rao
中科院分区：
文献类型：
--
作者：
T. S. Radhakrishnan;M. Rao
用热重分析和裂解气相色谱法研究了端巯基液体多硫聚合物[HS（RS 2）nRSH，R = CH_2CH_2 OCH_2 OCH_2CH_2]与对苯醌二肟、PbO_2和MnO_2的固化反应。在420 ° C和470°C的快速热解下，在热解物的组成中观察到特征差异。发现热解产物中环状单体1，3-二氧杂-6，7-二硫杂环己烷的浓度随聚合物的不同而变化很大。通过热重分析法评价了降解机制随降解程度的变化以及相应的总活化能。的热解-GC和热重数据显示，提供部分表征的基板。Mn似乎是在MnO 2固化的聚合物中的配位络合物。
Polymers prepared by curing thiol-terminated liquid polysulfide polymer [HS(RS2)nRSH, R = CH2CH2OCH2OCH2CH2] with p-quinonedioxime, PbO2, and MnO2 were studied by pyrolysis-GC and thermogravimetry. Characteristic differences were observed in the composition of the pyrolyzates under flash pyrolysis at 420 and 470°C. The concentration of the cyclic monomer, 1,3-dioxa-6,7-dithionane, in the pyrolyzates was found to vary considerably from polymer to polymer. The change in mechanism with the extent of degradation and the corresponding overall activation energies were evaluated by thermogravimetry. The pyrolysis-GC and thermogravimetric data were shown to provide partial characterization of the substrates. Mn appears to be in a coordinated complex in the MnO2-cured polymer.