Kinetics of Water Absorption and Hygrothermal Aging Rubber Toughened Poly(Butylene Terephthalate) With and Without Short Glass Fiber Reinforcement

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

Research output: Contribution to journalArticle

5 Citations (Scopus)

Abstract

The objectives of this paper were to investigate the water absorption and hygrothermal aging behavior of rubber-toughened poly(butylenes terephthalate) (RTPBT) with and without short glass fiber (SGF) reinforcement. The rubbers used in the study were A×8900 and E×L2314, both of which are acrylate-based terpolymer. The effect of the hygrothermal aging on its fracture properties was also studied. The kinetics of the water absorption study were carried out on the injection-molded samples of the RT-PBTs and the SGF-reinforced rubber-toughened PBT (SGF-RT-PBT) at three immersion temperatures, 30, 60 and 90°C, for a total of 450 h. The study of the deterioration caused by the hygrothermal aging was conducted by investigating the fracture parameters and flexural properties of all the materials as both hygrothermally aged (HA) and redried state (RD). The modes of the failure of HA and RD samples were studied using the scanning electron microscopy (SEM) technique, It was found that all the samples conformed to Fickian behavior and the kinetics of absorption exhibited a strong dependency on the rubber types, presence of SGF, as well as the immersion temperature. Generally, SGF-RT-PBT showed a better resistance to hygrothermal aging than that of RT-PBT and PBT, though a declining trend was observed in the fracture parameters, Kc and Gc. However, an opposite observation was exhibited in the flexural properties in some, but not all cases. Finally, the results obtained from SEM micrographs showed that permanent damage occurred in the materials and the hygrothermal aging had suppressed the plastic deformation ability of the PBT matrix and both types of impact modifiers where brittle failure was observed. Fiber pull-out was apparently the failure mode of the SGF-reinforced materials.

Original languageEnglish
Pages (from-to)506-516
Number of pages11
JournalJournal of Applied Polymer Science
Volume92
Issue number1
Publication statusPublished - Apr 5 2004

Fingerprint

Rubber
Water absorption
Fiber reinforced materials
Glass fibers
Aging of materials
Kinetics
Scanning electron microscopy
Terpolymers
Butenes
Failure modes
Deterioration
Plastic deformation
fiberglass
terephthalic acid
butylene
Temperature
Fibers

Keywords

  • Flexural properties
  • Fracture toughness
  • Hygrothermal aging
  • Poly(butylene terephthalate)
  • Rubber toughened
  • Short glass fiber reinforced
  • Water absorption

ASJC Scopus subject areas

  • Polymers and Plastics

Cite this

Kinetics of Water Absorption and Hygrothermal Aging Rubber Toughened Poly(Butylene Terephthalate) With and Without Short Glass Fiber Reinforcement. / Yow, B. N.; Ishiaku, U. S.; Mohd Ishak, Z. A.; Karger-Kocsis, J.

In: Journal of Applied Polymer Science, Vol. 92, No. 1, 05.04.2004, p. 506-516.

Research output: Contribution to journalArticle

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AB - The objectives of this paper were to investigate the water absorption and hygrothermal aging behavior of rubber-toughened poly(butylenes terephthalate) (RTPBT) with and without short glass fiber (SGF) reinforcement. The rubbers used in the study were A×8900 and E×L2314, both of which are acrylate-based terpolymer. The effect of the hygrothermal aging on its fracture properties was also studied. The kinetics of the water absorption study were carried out on the injection-molded samples of the RT-PBTs and the SGF-reinforced rubber-toughened PBT (SGF-RT-PBT) at three immersion temperatures, 30, 60 and 90°C, for a total of 450 h. The study of the deterioration caused by the hygrothermal aging was conducted by investigating the fracture parameters and flexural properties of all the materials as both hygrothermally aged (HA) and redried state (RD). The modes of the failure of HA and RD samples were studied using the scanning electron microscopy (SEM) technique, It was found that all the samples conformed to Fickian behavior and the kinetics of absorption exhibited a strong dependency on the rubber types, presence of SGF, as well as the immersion temperature. Generally, SGF-RT-PBT showed a better resistance to hygrothermal aging than that of RT-PBT and PBT, though a declining trend was observed in the fracture parameters, Kc and Gc. However, an opposite observation was exhibited in the flexural properties in some, but not all cases. Finally, the results obtained from SEM micrographs showed that permanent damage occurred in the materials and the hygrothermal aging had suppressed the plastic deformation ability of the PBT matrix and both types of impact modifiers where brittle failure was observed. Fiber pull-out was apparently the failure mode of the SGF-reinforced materials.

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