Citation: Ruo-Bing Yu, Chi-Xing Zhou, Wei Yu. STUDY ON INTERMITTENT SHEAR FLOW AND RELAXATION BEHAVIOR OF THERMOTROPIC LIQUID CRYSTALLINE POLYMER[J]. Chinese Journal of Polymer Science, ;2005, 23(3): 285-291. shu

STUDY ON INTERMITTENT SHEAR FLOW AND RELAXATION BEHAVIOR OF THERMOTROPIC LIQUID CRYSTALLINE POLYMER

Corresponding author: Chi-Xing Zhou,
Received Date: 9 April 2004
Revised Date: 8 May 2004

Intermittent shear flow including start-up flow and small oscillatory amplitude time sweep or stress relaxation after cessation of shear flow was used to study the rheological behavior and internal structure of thermotropic liquid crystalline polymer (TLCP). There are two kinds of intermittent shear flow: all start-up flows are in the same direction (intermittent flow forward: IFF) and start-up flows change their directions alternately (intermittent flow reversal: IFR). The results show that the stress of start-up flow of IFF and IFR in the test process is not superposed, indicating different changes of internal structure of thermotropic LCP (TLCP). Two main factors affect structure changes in the experimental time scale. One relates to long-term texture relaxation process, the other is an interchain reaction that becomes important after 30 min. The two factors raise the stress of IFF, but express complex effects for the stress of IFR. The latter factor becomes very important at long time annealing process. The relaxation behavior was also studied by the application of wide range relaxation spectrum calculated from the combined dynamic modulus, which gave three characteristic relaxation times (0.3, 10 and 600 s) ascribable to the relaxations of less-phase orientation, domain orientation, and domain deformation, respectively. The result also shows that the domain coalescence (texture relaxation), a long relaxation time, is a much slow process and lasts beyond 2400 s of the test time.
1. [1]
  Hongdao LI , Shengjian ZHANG , Hongmei DONG . Magnetic relaxation and luminescent behavior in nitronyl nitroxide-based annuluses of rare-earth ions. Chinese Journal of Inorganic Chemistry, 2024, 40(5): 972-978. doi: 10.11862/CJIC.20230411
2. [2]
  Xin-Tong Zhao , Jin-Zhi Guo , Wen-Liang Li , Jing-Ping Zhang , Xing-Long Wu . Two-dimensional conjugated coordination polymer monolayer as anode material for lithium-ion batteries: A DFT study. Chinese Chemical Letters, 2024, 35(6): 108715-. doi: 10.1016/j.cclet.2023.108715
3. [3]
  Jun Guo , Zhenbang Zhuang , Wanqiang Liu , Gang Huang . "Co-coordination force" assisted rigid-flexible coupling crystalline polymer for high-performance aqueous zinc-organic batteries. Chinese Chemical Letters, 2024, 35(9): 109803-. doi: 10.1016/j.cclet.2024.109803
4. [4]
  Jiakun Bai , Junhui Jia , Aisen Li . An elastic organic crystal with piezochromic luminescent behavior. Chinese Journal of Structural Chemistry, 2024, 43(6): 100323-100323. doi: 10.1016/j.cjsc.2024.100323
5. [5]
  Hui Jin , Qin Cai , Peiwen Liu , Yan Chen , Derong Wang , Weiping Zhu , Yufang Xu , Xuhong Qian . Multistep continuous flow synthesis of Erlotinib. Chinese Chemical Letters, 2024, 35(4): 108721-. doi: 10.1016/j.cclet.2023.108721
6. [6]
  Tao Wei , Jiahao Lu , Pan Zhang , Qi Zhang , Guang Yang , Ruizhi Yang , Daifen Chen , Qian Wang , Yongfu Tang . An intermittent lithium deposition model based on bimetallic MOFs derivatives for dendrite-free lithium anode with ultrahigh areal capacity. Chinese Chemical Letters, 2024, 35(8): 109122-. doi: 10.1016/j.cclet.2023.109122
7. [7]
  Peiwen Liu , Fang Zhao , Jing Zhang , Yunpeng Bai , Jinxing Ye , Bo Bao , Xinggui Zhou , Li Zhang , Changlu Zhou , Xinhai Yu , Peng Zuo , Jianye Xia , Lian Cen , Yangyang Yang , Guoyue Shi , Lin Xu , Weiping Zhu , Yufang Xu , Xuhong Qian . Micro/nano flow chemistry by Beyond Limits Manufacturing. Chinese Chemical Letters, 2024, 35(5): 109020-. doi: 10.1016/j.cclet.2023.109020
8. [8]
  Fangwen Peng , Zhen Luo , Yingjin Ma , Haibo Ma . Theoretical study of aromaticity reversal in dimethyldihydropyrene derivatives. Chinese Journal of Structural Chemistry, 2024, 43(5): 100273-100273. doi: 10.1016/j.cjsc.2024.100273
9. [9]
  Yan Zou , Yin-Shuang Hu , Deng-Hui Tian , Hong Wu , Xiaoshu Lv , Guangming Jiang , Yu-Xi Huang . Tuning the membrane rejection behavior by surface wettability engineering for an effective water-in-oil emulsion separation. Chinese Chemical Letters, 2024, 35(6): 109090-. doi: 10.1016/j.cclet.2023.109090
10. [10]
  Liliang Chu , Xiaoyan Zhang , Jianing Li , Xuelei Deng , Miao Wu , Ya Cheng , Weiping Zhu , Xuhong Qian , Yunpeng Bai . Continuous-flow synthesis of polysubstituted γ-butyrolactones via enzymatic cascade catalysis. Chinese Chemical Letters, 2024, 35(4): 108896-. doi: 10.1016/j.cclet.2023.108896
11. [11]
  Hongxia Li , Xiyang Wang , Du Qiao , Jiahao Li , Weiping Zhu , Honglin Li . Mechanism of nanoparticle aggregation in gas-liquid microfluidic mixing. Chinese Chemical Letters, 2024, 35(4): 108747-. doi: 10.1016/j.cclet.2023.108747
12. [12]
  Xinzhi Ding , Chong Liu , Jing Niu , Nan Chen , Shutao Xu , Yingxu Wei , Zhongmin Liu . Solid-state NMR study of the stability of MOR framework aluminum. Chinese Journal of Structural Chemistry, 2024, 43(4): 100247-100247. doi: 10.1016/j.cjsc.2024.100247
13. [13]
  Dan-Ying Xing , Xiao-Dan Zhao , Chuan-Shu He , Bo Lai . Kinetic study and DFT calculation on the tetracycline abatement by peracetic acid. Chinese Chemical Letters, 2024, 35(9): 109436-. doi: 10.1016/j.cclet.2023.109436
14. [14]
  Tiankai Sun , Hui Min , Zongsu Han , Liang Wang , Peng Cheng , Wei Shi . Rapid detection of nanoplastic particles by a luminescent Tb-based coordination polymer. Chinese Chemical Letters, 2024, 35(5): 108718-. doi: 10.1016/j.cclet.2023.108718
15. [15]
  Mengjun Sun , Zhi Wang , Jvhui Jiang , Xiaobing Wang , Chuang Yu . Gelation mechanisms of gel polymer electrolytes for zinc-based batteries. Chinese Chemical Letters, 2024, 35(5): 109393-. doi: 10.1016/j.cclet.2023.109393
16. [16]
  Huimin Gao , Zhuochen Yu , Xuze Zhang , Xiangkun Yu , Jiyuan Xing , Youliang Zhu , Hu-Jun Qian , Zhong-Yuan Lu . A mini review of the recent progress in coarse-grained simulation of polymer systems. Chinese Journal of Structural Chemistry, 2024, 43(5): 100266-100266. doi: 10.1016/j.cjsc.2024.100266
17. [17]
  Dong Lv , Xuelei Liu , Wei Li , Qiang Zhang , Xinhong Yu , Yanchun Han . Single droplet formation by controlling the viscoelasticity of polymer solutions during inkjet printing. Chinese Chemical Letters, 2024, 35(6): 109401-. doi: 10.1016/j.cclet.2023.109401
18. [18]
  Jinjie Lu , Qikai Liu , Yuting Zhang , Yi Zhou , Yanbo Zhou . Antibacterial performance of cationic quaternary phosphonium-modified chitosan polymer in water. Chinese Chemical Letters, 2024, 35(9): 109406-. doi: 10.1016/j.cclet.2023.109406
19. [19]
  Hongjie Guo , Qiang Wei , Yangyang Wu , Wei Qiu , Hongliang Li , Changyong Zhang . Enhanced nitrate removal from groundwater using a conductive spacer in flow-electrode capacitive deionization. Chinese Chemical Letters, 2024, 35(8): 109325-. doi: 10.1016/j.cclet.2023.109325
20. [20]
  Jiao Li , Chenyang Zhang , Chuhan Wu , Yan Liu , Xuejian Zhang , Xiao Li , Yongtao Li , Jing Sun , Zhongmin Su . Defined organic-octamolybdate crystalline superstructures derived Mo₂C@C as efficient hydrogen evolution electrocatalysts. Chinese Chemical Letters, 2024, 35(6): 108782-. doi: 10.1016/j.cclet.2023.108782

Get Citation

PDF

XML

Metrics

PDF Downloads(0)
Abstract views(433)
HTML views(20)

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