Hygrothermal aging and fracture behavior of short-glass-fiber-reinforced rubber-toughened poly(butylene terephthalate) composites

Z. A. Mohd Ishak, U. S. Ishiaku, J. Karger-Kocsis

Research output: Contribution to journalArticle

36 Citations (Scopus)

Abstract

The fracture behavior of injection-molded poly(butylene terephthalate) (PBT), core-shell rubber toughened PBT (PBT-CSR) and their related short-glass-fiber composites have been investigated. The investigation was focused on the effect of internal parameters, i.e. rubber and/or glass-fiber content and external parameters, i.e. testing temperature, deformation rates and hygrothermal aging on the fracture behavior of these materials. The fracture properties of the various materials were determined on static-loaded compact tension specimens. It was shown that the tensile and fracture behavior of PBT and its related composites is affected by both internal and external parameters. A significant enhancement of both fracture parameters, i.e. fracture toughness, K(c), and energy, G(c), was achieved by the combination of CSR impact modifier and glass-fiber reinforcement, although the values of both K(c) and G(c) were slightly lower than those of PBT glass-fiber composites. Poor retention of tensile and fracture properties on exposure to hygrothermal aging at 90°C was observed in all materials and these properties could not be restored by subsequent drying. Qualitative evidence from scanning electron microscopy (SEM) indicates that severe hydrolytic degradation of the PBT matrix has caused permanent damage to the materials. The superior retention and recovery of the fracture properties of PBT-CSR-glass fiber as compared to PBT-glass fiber is an indication that the combination of glass fiber and core-shell rubber produced a synergistic effect on the fracture behavior of PBT under such adverse conditions. The failure modes of PBT and the related composites, assessed by SEM fractographic studies are discussed. (C) 2000 Elsevier Science Ltd. All rights reserved.

Original languageEnglish
Pages (from-to)803-815
Number of pages13
JournalComposites Science and Technology
Volume60
Issue number6
DOIs
Publication statusPublished - May 2000

Fingerprint

Rubber
Glass fibers
Aging of materials
Composite materials
Scanning electron microscopy
fiberglass
terephthalic acid
butylene
Fiber reinforced materials
Failure modes
Fracture toughness
Drying
Recovery
Degradation
Testing

Keywords

  • Fiber-reinforced thermoplastics
  • Fracture
  • Hygrothermal aging
  • Poly(butylene terephthalate)
  • Rubber-toughened

ASJC Scopus subject areas

  • Engineering(all)
  • Ceramics and Composites

Cite this

Hygrothermal aging and fracture behavior of short-glass-fiber-reinforced rubber-toughened poly(butylene terephthalate) composites. / Mohd Ishak, Z. A.; Ishiaku, U. S.; Karger-Kocsis, J.

In: Composites Science and Technology, Vol. 60, No. 6, 05.2000, p. 803-815.

Research output: Contribution to journalArticle

@article{12c78439d35d4c6b8c42dda392f669fd,
title = "Hygrothermal aging and fracture behavior of short-glass-fiber-reinforced rubber-toughened poly(butylene terephthalate) composites",
abstract = "The fracture behavior of injection-molded poly(butylene terephthalate) (PBT), core-shell rubber toughened PBT (PBT-CSR) and their related short-glass-fiber composites have been investigated. The investigation was focused on the effect of internal parameters, i.e. rubber and/or glass-fiber content and external parameters, i.e. testing temperature, deformation rates and hygrothermal aging on the fracture behavior of these materials. The fracture properties of the various materials were determined on static-loaded compact tension specimens. It was shown that the tensile and fracture behavior of PBT and its related composites is affected by both internal and external parameters. A significant enhancement of both fracture parameters, i.e. fracture toughness, K(c), and energy, G(c), was achieved by the combination of CSR impact modifier and glass-fiber reinforcement, although the values of both K(c) and G(c) were slightly lower than those of PBT glass-fiber composites. Poor retention of tensile and fracture properties on exposure to hygrothermal aging at 90°C was observed in all materials and these properties could not be restored by subsequent drying. Qualitative evidence from scanning electron microscopy (SEM) indicates that severe hydrolytic degradation of the PBT matrix has caused permanent damage to the materials. The superior retention and recovery of the fracture properties of PBT-CSR-glass fiber as compared to PBT-glass fiber is an indication that the combination of glass fiber and core-shell rubber produced a synergistic effect on the fracture behavior of PBT under such adverse conditions. The failure modes of PBT and the related composites, assessed by SEM fractographic studies are discussed. (C) 2000 Elsevier Science Ltd. All rights reserved.",
keywords = "Fiber-reinforced thermoplastics, Fracture, Hygrothermal aging, Poly(butylene terephthalate), Rubber-toughened",
author = "{Mohd Ishak}, {Z. A.} and Ishiaku, {U. S.} and J. Karger-Kocsis",
year = "2000",
month = "5",
doi = "10.1016/S0266-3538(99)00193-1",
language = "English",
volume = "60",
pages = "803--815",
journal = "Composites Science and Technology",
issn = "0266-3538",
publisher = "Elsevier BV",
number = "6",

}

TY - JOUR

T1 - Hygrothermal aging and fracture behavior of short-glass-fiber-reinforced rubber-toughened poly(butylene terephthalate) composites

AU - Mohd Ishak, Z. A.

AU - Ishiaku, U. S.

AU - Karger-Kocsis, J.

PY - 2000/5

Y1 - 2000/5

N2 - The fracture behavior of injection-molded poly(butylene terephthalate) (PBT), core-shell rubber toughened PBT (PBT-CSR) and their related short-glass-fiber composites have been investigated. The investigation was focused on the effect of internal parameters, i.e. rubber and/or glass-fiber content and external parameters, i.e. testing temperature, deformation rates and hygrothermal aging on the fracture behavior of these materials. The fracture properties of the various materials were determined on static-loaded compact tension specimens. It was shown that the tensile and fracture behavior of PBT and its related composites is affected by both internal and external parameters. A significant enhancement of both fracture parameters, i.e. fracture toughness, K(c), and energy, G(c), was achieved by the combination of CSR impact modifier and glass-fiber reinforcement, although the values of both K(c) and G(c) were slightly lower than those of PBT glass-fiber composites. Poor retention of tensile and fracture properties on exposure to hygrothermal aging at 90°C was observed in all materials and these properties could not be restored by subsequent drying. Qualitative evidence from scanning electron microscopy (SEM) indicates that severe hydrolytic degradation of the PBT matrix has caused permanent damage to the materials. The superior retention and recovery of the fracture properties of PBT-CSR-glass fiber as compared to PBT-glass fiber is an indication that the combination of glass fiber and core-shell rubber produced a synergistic effect on the fracture behavior of PBT under such adverse conditions. The failure modes of PBT and the related composites, assessed by SEM fractographic studies are discussed. (C) 2000 Elsevier Science Ltd. All rights reserved.

AB - The fracture behavior of injection-molded poly(butylene terephthalate) (PBT), core-shell rubber toughened PBT (PBT-CSR) and their related short-glass-fiber composites have been investigated. The investigation was focused on the effect of internal parameters, i.e. rubber and/or glass-fiber content and external parameters, i.e. testing temperature, deformation rates and hygrothermal aging on the fracture behavior of these materials. The fracture properties of the various materials were determined on static-loaded compact tension specimens. It was shown that the tensile and fracture behavior of PBT and its related composites is affected by both internal and external parameters. A significant enhancement of both fracture parameters, i.e. fracture toughness, K(c), and energy, G(c), was achieved by the combination of CSR impact modifier and glass-fiber reinforcement, although the values of both K(c) and G(c) were slightly lower than those of PBT glass-fiber composites. Poor retention of tensile and fracture properties on exposure to hygrothermal aging at 90°C was observed in all materials and these properties could not be restored by subsequent drying. Qualitative evidence from scanning electron microscopy (SEM) indicates that severe hydrolytic degradation of the PBT matrix has caused permanent damage to the materials. The superior retention and recovery of the fracture properties of PBT-CSR-glass fiber as compared to PBT-glass fiber is an indication that the combination of glass fiber and core-shell rubber produced a synergistic effect on the fracture behavior of PBT under such adverse conditions. The failure modes of PBT and the related composites, assessed by SEM fractographic studies are discussed. (C) 2000 Elsevier Science Ltd. All rights reserved.

KW - Fiber-reinforced thermoplastics

KW - Fracture

KW - Hygrothermal aging

KW - Poly(butylene terephthalate)

KW - Rubber-toughened

UR - http://www.scopus.com/inward/record.url?scp=0006374856&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=0006374856&partnerID=8YFLogxK

U2 - 10.1016/S0266-3538(99)00193-1

DO - 10.1016/S0266-3538(99)00193-1

M3 - Article

VL - 60

SP - 803

EP - 815

JO - Composites Science and Technology

JF - Composites Science and Technology

SN - 0266-3538

IS - 6

ER -