ICCAS OpenIR
Infrared spectroscopic and modulated differential scanning calorimetric study of physical aging in bisphenol A polycarbonate
Lu, J; Wang, Y; Shen, DY
2000
Source PublicationPOLYMER JOURNAL
ISSN0032-3896
Volume32Issue:7Pages:610-615
AbstractFT-IR spectroscopy was used to examine conformational changes in the quenched Bisphenol A Polycarbonate (BPAPC) films during physical aging. It was observed that the amount of energy favored trans-trans conformers increased, while energy less favored trans-cia conformers decreased upon sub-T-g annealing. Since the trans-trans conformers allow closer local packing of the polymer chains than the trans-cis conformers do, the results may indicate that sub-T-g annealing will lead to closer interchain packing. In situ FT-IR studies on the conformational changes of BPAPC films with different thermal histories, i.e., quenched from the rubbery and sub-T-g annealed for different time, were carried out while increasing the temperature through the glass transition region. The temperature dependencies of the infra-red spectra show that incremental changes of the population of trans-cis conformers in the quenched sample are gradual, while rather abrupt changes occur in the sub-T-g annealed samples. The magnitude and temperature of the abrupt changes of trans-cia conformers are related with the time of the suh-T-g annealing. The energy absorbed during the abrupt conformational change represents only part of the energy of the endothermic peak observed by modulated differential scanning calorimetry. The results are explained in terms of the formation of new cohesional entanglements during sub-T-g annealing.
KeywordBisphenol a Polycarbonate Physical Aging Sub-t-g Annealing Conformations Infra-red Spectroscopy
Indexed BySCI
Language英语
WOS IDWOS:000089083400012
PublisherSOC POLYMER SCIENCE JAPAN
Citation statistics
Document Type期刊论文
Identifierhttp://ir.iccas.ac.cn/handle/121111/75774
Collection中国科学院化学研究所
Corresponding AuthorLu, J
AffiliationAcad Sinica, Inst Chem, Beijing 100080, Peoples R China
Recommended Citation
GB/T 7714
Lu, J,Wang, Y,Shen, DY. Infrared spectroscopic and modulated differential scanning calorimetric study of physical aging in bisphenol A polycarbonate[J]. POLYMER JOURNAL,2000,32(7):610-615.
APA Lu, J,Wang, Y,&Shen, DY.(2000).Infrared spectroscopic and modulated differential scanning calorimetric study of physical aging in bisphenol A polycarbonate.POLYMER JOURNAL,32(7),610-615.
MLA Lu, J,et al."Infrared spectroscopic and modulated differential scanning calorimetric study of physical aging in bisphenol A polycarbonate".POLYMER JOURNAL 32.7(2000):610-615.
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