Yielding behaviour in model epoxy thermosets - I. Effect of strain rate and composition

被引：91

作者：

Mayr, AE ^{[1
]}

Cook, WD ^{[1
]}

Edward, GH ^{[1
]}

机构：

[1] Monash Univ, Dept Mat Engn, Melbourne, Vic 3168, Australia

来源：

POLYMER | 1998年 / 39卷 / 16期

关键词：

yielding; yield stress; strain rate;

D O I：

10.1016/S0032-3861(97)10334-2

中图分类号：

O63 [高分子化学（高聚物）];

学科分类号：

070305 ; 080501 ; 081704 ;

摘要：

Yielding behaviour was investigated in two series of epoxy networks where the molecular architecture (crosslink density) was varied without any significant chemical changes in the structure. The DGEBA-based networks cured with aromatic amines had higher yield stresses than related networks cured with aliphatic amines, due to differences in the rigidity of the backbone. In each series, the yield stress was also found to rise with increased crosslinking. This may be caused by the increased constraint of the crosslinks on the molecular segments involved in the yielding process. The Eyring equation was found to satisfactorily describe the dependence of the yield stress on the strain rate. Surprisingly, the calculated volume of the flow unit was independent of both the crosslink density and the nature of the amine. (C) 1998 Elsevier Science Ltd. All rights reserved.

引用

页码：3719 / 3724

页数：6

共 24 条

[11] Ginsburg, 1967, AMINES THEIR PROPERT, P62
[12] Kinloch A.J., 1983, FRACTURE BEHAV POLYM
[13] Lesser AJ, 1997, J POLYM SCI POL PHYS, V35, P1611, DOI 10.1002/(SICI)1099-0488(19970730)35:10<1611::AID-POLB13>3.0.CO
[14] 2-D
[15] MCCRUM NG, 1992, PRINCIPLES POLYM ENG, P174
[16] OLEINIK EF, 1986, ADV POLYM SCI, V80, P49
[17] Mechanical properties of thermosets .1. Tensile properties of an anhydride cured epoxy
Tcharkhtchi, A
Faivre, S
Roy, LE
Trotignon, JP
Verdu, J
[J]. JOURNAL OF MATERIALS SCIENCE, 1996, 31 (10) : 2687 - 2692
[18] TRUONG VT, 1991, POLYM COMMUN, V32, P275
[19] INFLUENCE OF CHAIN FLEXIBILITY AND CROSS-LINK DENSITY ON MECHANICAL-PROPERTIES OF EPOXY AMINE NETWORKS
URBACZEWSKIESPUCHE, E
GALY, J
GERARD, JF
PASCAULT, JP
SAUTEREAU, H
[J]. POLYMER ENGINEERING AND SCIENCE, 1991, 31 (22) : 1572 - 1580
[20] Vallo CI, 1993, POLYM GELS NETW, V1, P257, DOI DOI 10.1016/0966-7822(93)90004-2

← 1 2 3 →