Citation: QIAN Renyuan, SHEN Deyan, LI Huiming. FOURIER TRANSFORM INFRARED STUDIES OF POLY (ETHYLENE TEREPHTHALATE) FILM IN THE GLASS TRANSITION REGION[J]. Chinese Journal of Polymer Science, ;1989, 7(2): 150-158. shu

FOURIER TRANSFORM INFRARED STUDIES OF POLY (ETHYLENE TEREPHTHALATE) FILM IN THE GLASS TRANSITION REGION

Received Date: 5 May 1988

Three specimens from a solution-cast poly (ethylene terephthalate) (PET) film, one being liquid-N2 quenched from 92℃(Q), one being slowly cooled from 92℃(SC) and one being quenched and sub-Tg annealed at 67℃(AN), have been studied by specimen difference spectra Q-SC and AN-Q and temperature difference spectra T-70 and T2-T1 for every 2℃ steps on heating to 90℃ at 2℃ /min. SC and AN showed more gauche conformers than Q. That means that the PET chain has more trans conformers at higher temperatures and some of these are frozen during quenching through Tg.A band at 1340 cm-1 has been found to be complex containing overlapping bands reflecting trans in crystalline regions and trans in amorphous regions.The temperature difference spectra on heating through Tg showed that the spectral changes in Q are gradual while a rather abrupt change occurs in AN at 80 - 82℃ for the bands at 1340,1042 and 1020 cm-1.No New conformational structure or new vibrational mode is involved.A kind of locking mechanism is suggested which hinders the molecular vibrational changes in AN below Tg until a sudden release occurs at Tg.These locking sites can be nothing else than sites of tighter local packing of chain segments.Consequently it is believed that inter-chain van der Waals attraction energy plays a dominating role in the volume relaxation and sub-Tg annealing of quenched amorphous polymers.
1. [1]
  Haojie Song , Laiyu Luo , Siyu Wang , Guo Zhang , Baojiang Jiang . Advances in poly(heptazine imide)/poly(triazine imide) photocatalyst. Chinese Chemical Letters, 2024, 35(10): 109347-. doi: 10.1016/j.cclet.2023.109347
2. [2]
  Hailong He , Wenbing Wang , Wenmin Pang , Chen Zou , Dan Peng . Double stimulus-responsive palladium catalysts for ethylene polymerization and copolymerization. Chinese Chemical Letters, 2024, 35(7): 109534-. doi: 10.1016/j.cclet.2024.109534
3. [3]
  Weichen Zhu , Wei Zuo , Pu Wang , Wei Zhan , Jun Zhang , Lipin Li , Yu Tian , Hong Qi , Rui Huang . Fe-N-C heterogeneous Fenton-like catalyst for the degradation of tetracycline: Fe-N coordination and mechanism studies. Chinese Chemical Letters, 2024, 35(9): 109341-. doi: 10.1016/j.cclet.2023.109341
4. [4]
  Junying Zhang , Ruochen Li , Haihua Wang , Wenbing Kang , Xing-Dong Xu . Photo-induced tunable luminescence from an aggregated amphiphilic ethylene-pyrene derivative in aqueous media. Chinese Chemical Letters, 2024, 35(6): 109216-. doi: 10.1016/j.cclet.2023.109216
5. [5]
  Kexin Yuan , Yulei Liu , Haoran Feng , Yi Liu , Jun Cheng , Beiyang Luo , Qinglian Wu , Xinyu Zhang , Ying Wang , Xian Bao , Wanqian Guo , Jun Ma . Unlocking the potential of thin-film composite reverse osmosis membrane performance: Insights from mass transfer modeling. Chinese Chemical Letters, 2024, 35(5): 109022-. doi: 10.1016/j.cclet.2023.109022
6. [6]
  Ting WANG , Peipei ZHANG , Shuqin LIU , Ruihong WANG , Jianjun ZHANG . A Bi-CP-based solid-state thin-film sensor: Preparation and luminescence sensing for bioamine vapors. Chinese Journal of Inorganic Chemistry, 2024, 40(8): 1615-1621. doi: 10.11862/CJIC.20240134
7. [7]
  Weijian Zhang , Xianyu Deng , Liying Wang , Jian Wang , Xiuting Guo , Lianggui Huang , Xinyi Wang , Jun Wu , Linjia Jiang . Poly(ferulic acid) nanocarrier enhances chemotherapy sensitivity of acute myeloid leukemia by selectively targeting inflammatory macrophages. Chinese Chemical Letters, 2024, 35(9): 109422-. doi: 10.1016/j.cclet.2023.109422
8. [8]
  Chen Lian , Si-Han Zhao , Hai-Lou Li , Xinhua Cao . A giant Ce-containing poly(tungstobismuthate): Synthesis, structure and catalytic performance for the decontamination of a sulfur mustard simulant. Chinese Chemical Letters, 2024, 35(10): 109343-. doi: 10.1016/j.cclet.2023.109343
9. [9]
  Xiaoxiao Huang , Zhi-Long He , Yangpeng Chen , Lei Li , Zhenyu Yang , Chunyang Zhai , Mingshan Zhu . Novel P-doping-tuned Pd nanoflowers/S,N-GQDs photo-electrocatalyst for high-efficient ethylene glycol oxidation. Chinese Chemical Letters, 2024, 35(6): 109271-. doi: 10.1016/j.cclet.2023.109271
10. [10]
  Wenhao Chen , Muxuan Wu , Han Chen , Lue Mo , Yirong Zhu . Cu₂Se@C thin film with three-dimensional braided structure as a cathode material for enhanced Cu²⁺ storage. Chinese Chemical Letters, 2024, 35(5): 108698-. doi: 10.1016/j.cclet.2023.108698
11. [11]
  Zihao Wang , Jing Xue , Zhicui Song , Jianxiong Xing , Aijun Zhou , Jianmin Ma , Jingze Li . Li-Zn alloy patch for defect-free polymer interface film enables excellent protection effect towards stable Li metal anode. Chinese Chemical Letters, 2024, 35(10): 109489-. doi: 10.1016/j.cclet.2024.109489
12. [12]
  Wenxiang Ma , Xinyu He , Tianyi Chen , De-Li Ma , Hongzheng Chen , Chang-Zhi Li . Near-infrared non-fused electron acceptors for efficient organic photovoltaics. Chinese Chemical Letters, 2024, 35(4): 109099-. doi: 10.1016/j.cclet.2023.109099
13. [13]
  Zhili Li , Qijun Wo , Dongdong Huang , Dezhong Zhou , Lei Guo , Yeqing Mao . Improving gene transfection efficiency of highly branched poly(β-amino ester)s through the in-situ conversion of inactive terminal groups. Chinese Chemical Letters, 2024, 35(8): 109737-. doi: 10.1016/j.cclet.2024.109737
14. [14]
  Yatian Deng , Dao Wang , Jinglan Cheng , Yunkun Zhao , Zongbao Li , Chunyan Zang , Jian Li , Lichao Jia . A new popular transition metal-based catalyst: SmMn₂O₅ mullite-type oxide. Chinese Chemical Letters, 2024, 35(8): 109141-. doi: 10.1016/j.cclet.2023.109141
15. [15]
  Feibin Wei , Yongfang Rao , Yu Huang , Wei Wang , Hui Mei . The new challenges for the development of NH₃-SCR catalysts under new situation of energy transition in power generation industry. Chinese Chemical Letters, 2024, 35(6): 108931-. doi: 10.1016/j.cclet.2023.108931
16. [16]
  Tian Yang , Yi Liu , Lina Hua , Yaoyao Chen , Wuqian Guo , Haojie Xu , Xi Zeng , Changhao Gao , Wenjing Li , Junhua Luo , Zhihua Sun . Lead-free hybrid two-dimensional double perovskite with switchable dielectric phase transition. Chinese Chemical Letters, 2024, 35(6): 108707-. doi: 10.1016/j.cclet.2023.108707
17. [17]
  Boqiang Wang , Yongzhuo Xu , Jiajia Wang , Muyang Yang , Guo-Jun Deng , Wen Shao . Transition-metal free trifluoromethylimination of alkenes enabled by direct activation of N-unprotected ketimines. Chinese Chemical Letters, 2024, 35(9): 109502-. doi: 10.1016/j.cclet.2024.109502
18. [18]
  Zhaohong Chen , Mengzhen Li , Jinfei Lan , Shengqian Hu , Xiaogang Chen . Organic ferroelastic enantiomers with high T_c and large dielectric switching ratio triggered by order-disorder and displacive phase transition. Chinese Chemical Letters, 2024, 35(10): 109548-. doi: 10.1016/j.cclet.2024.109548
19. [19]
  Zhi-Yuan Yue , Hua-Kai Li , Na Wang , Shan-Shan Liu , Le-Ping Miao , Heng-Yun Ye , Chao Shi . Dehydration-triggered structural phase transition-associated ferroelectricity in a hybrid perovskite-type crystal. Chinese Chemical Letters, 2024, 35(10): 109355-. doi: 10.1016/j.cclet.2023.109355
20. [20]
  Yanrui Liu , Paramaguru Ganesan , Peng Gao . Harnessing d-f transition rare earth complexes for single layer white organic light emitting diodes. Chinese Journal of Structural Chemistry, 2024, 43(9): 100369-100369. doi: 10.1016/j.cjsc.2024.100369

Get Citation

PDF

XML

Metrics

PDF Downloads(0)
Abstract views(411)
HTML views(13)

通讯作者: 陈斌, bchen63@163.com

1.
沈阳化工大学材料科学与工程学院沈阳 110142

Address：Zhongguancun North First Street 2,100190 Beijing, PR China Tel: +86-010-82449177-888

DownLoad: Full-Size Img PowerPoint

Return