Molecular weight and concentration effects on gel/sol transitions in a segmented rigid-rod polyimide solution

Sung Koo Lee, Stephen Z D Cheng, Zongquan Wu, Chul Joo Lee, Frank W. Harris, Thein Kyu, Jen Chang Yang

研究成果: 雜誌貢獻文章

14 引文 (Scopus)

摘要

Gel/sol and order/disorder transitions can be observed in a segmented rigid-rod polyimide solution at different concentrations and molecular weights. This polyimide was synthesized from 3.3',4,4'-biphenyltetracarboxylic dianhydride and 2,2'-bis(trifluoromethyl)-4,4'-diaminobiphenyl in refluxing 3-cresol in a one-step process. Above about 140°C, the polymers are completely soluble in 3-cresol in a concentration range up to 12(w/w)%. During cooling, the hot solutions undergo a mechanical sol/gel transition to form thermally reversible gels. In the gel state, an ordered structure develops. Both the gel/sol and order/disorder transitions are dependent upon concentration, temperature, and molecular weight, but the two transitions exhibit different kinetics. Possible mechanisms of these transitions are discussed.
原文英語
頁(從 - 到)115-122
頁數8
期刊Polymer International
30
發行號1
出版狀態已發佈 - 1993
對外發佈Yes

指紋

3-cresol
Polymethyl Methacrylate
Sols
Polyimides
Gels
Molecular weight
Order disorder transitions
Sol-gels
Polymers
Cooling
Kinetics
Temperature

ASJC Scopus subject areas

  • Polymers and Plastics

引用此文

Lee, S. K., Cheng, S. Z. D., Wu, Z., Lee, C. J., Harris, F. W., Kyu, T., & Yang, J. C. (1993). Molecular weight and concentration effects on gel/sol transitions in a segmented rigid-rod polyimide solution. Polymer International, 30(1), 115-122.

Molecular weight and concentration effects on gel/sol transitions in a segmented rigid-rod polyimide solution. / Lee, Sung Koo; Cheng, Stephen Z D; Wu, Zongquan; Lee, Chul Joo; Harris, Frank W.; Kyu, Thein; Yang, Jen Chang.

於: Polymer International, 卷 30, 編號 1, 1993, p. 115-122.

研究成果: 雜誌貢獻文章

Lee, SK, Cheng, SZD, Wu, Z, Lee, CJ, Harris, FW, Kyu, T & Yang, JC 1993, 'Molecular weight and concentration effects on gel/sol transitions in a segmented rigid-rod polyimide solution', Polymer International, 卷 30, 編號 1, 頁 115-122.
Lee, Sung Koo ; Cheng, Stephen Z D ; Wu, Zongquan ; Lee, Chul Joo ; Harris, Frank W. ; Kyu, Thein ; Yang, Jen Chang. / Molecular weight and concentration effects on gel/sol transitions in a segmented rigid-rod polyimide solution. 於: Polymer International. 1993 ; 卷 30, 編號 1. 頁 115-122.
@article{dd1449d5e64446cea5e41de18fa573eb,
title = "Molecular weight and concentration effects on gel/sol transitions in a segmented rigid-rod polyimide solution",
abstract = "Gel/sol and order/disorder transitions can be observed in a segmented rigid-rod polyimide solution at different concentrations and molecular weights. This polyimide was synthesized from 3.3',4,4'-biphenyltetracarboxylic dianhydride and 2,2'-bis(trifluoromethyl)-4,4'-diaminobiphenyl in refluxing 3-cresol in a one-step process. Above about 140°C, the polymers are completely soluble in 3-cresol in a concentration range up to 12(w/w){\%}. During cooling, the hot solutions undergo a mechanical sol/gel transition to form thermally reversible gels. In the gel state, an ordered structure develops. Both the gel/sol and order/disorder transitions are dependent upon concentration, temperature, and molecular weight, but the two transitions exhibit different kinetics. Possible mechanisms of these transitions are discussed.",
author = "Lee, {Sung Koo} and Cheng, {Stephen Z D} and Zongquan Wu and Lee, {Chul Joo} and Harris, {Frank W.} and Thein Kyu and Yang, {Jen Chang}",
year = "1993",
language = "English",
volume = "30",
pages = "115--122",
journal = "Polymer International",
issn = "0959-8103",
publisher = "John Wiley and Sons Ltd",
number = "1",

}

TY - JOUR

T1 - Molecular weight and concentration effects on gel/sol transitions in a segmented rigid-rod polyimide solution

AU - Lee, Sung Koo

AU - Cheng, Stephen Z D

AU - Wu, Zongquan

AU - Lee, Chul Joo

AU - Harris, Frank W.

AU - Kyu, Thein

AU - Yang, Jen Chang

PY - 1993

Y1 - 1993

N2 - Gel/sol and order/disorder transitions can be observed in a segmented rigid-rod polyimide solution at different concentrations and molecular weights. This polyimide was synthesized from 3.3',4,4'-biphenyltetracarboxylic dianhydride and 2,2'-bis(trifluoromethyl)-4,4'-diaminobiphenyl in refluxing 3-cresol in a one-step process. Above about 140°C, the polymers are completely soluble in 3-cresol in a concentration range up to 12(w/w)%. During cooling, the hot solutions undergo a mechanical sol/gel transition to form thermally reversible gels. In the gel state, an ordered structure develops. Both the gel/sol and order/disorder transitions are dependent upon concentration, temperature, and molecular weight, but the two transitions exhibit different kinetics. Possible mechanisms of these transitions are discussed.

AB - Gel/sol and order/disorder transitions can be observed in a segmented rigid-rod polyimide solution at different concentrations and molecular weights. This polyimide was synthesized from 3.3',4,4'-biphenyltetracarboxylic dianhydride and 2,2'-bis(trifluoromethyl)-4,4'-diaminobiphenyl in refluxing 3-cresol in a one-step process. Above about 140°C, the polymers are completely soluble in 3-cresol in a concentration range up to 12(w/w)%. During cooling, the hot solutions undergo a mechanical sol/gel transition to form thermally reversible gels. In the gel state, an ordered structure develops. Both the gel/sol and order/disorder transitions are dependent upon concentration, temperature, and molecular weight, but the two transitions exhibit different kinetics. Possible mechanisms of these transitions are discussed.

UR - http://www.scopus.com/inward/record.url?scp=0027384876&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=0027384876&partnerID=8YFLogxK

M3 - Article

AN - SCOPUS:0027384876

VL - 30

SP - 115

EP - 122

JO - Polymer International

JF - Polymer International

SN - 0959-8103

IS - 1

ER -