Short glass fibre reinforcedpoly(butylene terephthalate) Part 1 –Microstructural characterisation and kinetics of moisture absorption

Ishak, Z. A. Mohd; Mansor, T.S.A. Tengku; Yow, B. N.; Ishiaku, U. S.; Karger‐Kocsis, J.

doi:10.1179/146580100101541058

Cited by 12 publications

(4 citation statements)

References 16 publications

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“…Variations in temperature and moisture are always encountered by these materials in service. Their combined effect, known as hydrothermal aging, can be more damaging to the mechanical properties of the composites than to either component alone 1. Some efforts have been focused on the hydrothermal behavior of thermoplastic composites 2–5.…”

Section: Introductionmentioning

confidence: 99%

Effect of hydrothermal environment on moisture absorption and mechanical properties of wood flour–filled polypropylene composites

Lin

Zhou

Dai

2002

J of Applied Polymer Sci

157

102

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ABSTRACT:The moisture absorption and mechanical properties of wood flour-filled polypropylene composites in a hydrothermal environment have been studied by immersing the composites in water at 23, 60, and 100°C. The degree of moisture absorption was found to be dependent on the modification of matrix, the weight percentage, mesh size, and surface treatment of wood flours. It increased with increasing the immersion temperature. The tensile strength of all composites with wood flours of different contents, mesh sizes, and surface treatments increased after immersion in water baths of various temperatures, to either greater or lesser extents. The flexural strength and modulus followed a similar trend when immersed in water at ambient temperature. However, the contrary was true for composites when immersed in 60 and 100°C water baths. The impact strength increased after immersion in water at each immersion temperature, and the extent of such increment decreased with increasing the immersion temperature.

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Section: Introductionmentioning

confidence: 99%

Effect of hydrothermal environment on moisture absorption and mechanical properties of wood flour–filled polypropylene composites

Lin

Zhou

Dai

2002

J of Applied Polymer Sci

157

102

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“…Among the results found in the literature, Bastioli et al [ 48 ], studied the water uptake of fiber-free PBT at 37 °C and identified a coefficient of diffusion of 4.40 ×

and an infinite mass of 0.65%, which is close to the results obtained for PBT at 35 °C. Ishak et al [ 32 ], at 30 °C, identified a coefficient of diffusion of 1.90 ×

for fiber-free PBT and 1.00 ×

for PBT-GF30. Closer to the highest temperature studied in the present paper, at 100 °C, Ishak et al [ 21 ] identified an infinite mass of 0.71% and a coefficient of diffusion of 4.05 ×

for a content of fibers close to 30% (at about 28.5%).…”

Section: Resultsmentioning

confidence: 99%

“…Ishak et al [ 32 ] studied the behavior of short fiber reinforced PBT immersed in water at 30, 60 and 90 °C for fiber contents between 0 and 18% in volume. For high temperature (90 °C), the toughness of the material decreases significantly.…”

Section: Introductionmentioning

confidence: 99%

Effect of Water Ingress on the Mechanical and Chemical Properties of Polybutylene Terephthalate Reinforced with Glass Fibers

et al. 2021

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Short fiber reinforced polymers are widely used in the construction of electronic housings, where they are often exposed to harsh environmental conditions. The main purpose of this work is the in-depth study and characterization of the water uptake behavior of PBT-GF30 (polybutylene terephthalate with 30% of short glass fiber)as well as its consequent effect on the mechanical properties of the material. Further analysis was conducted to determine at which temperature range PBT-GF30 starts experiencing chemical changes. The influence of testing procedures and conditions on the evaluation of these effects was analyzed, also drawing comparisons with previous studies. The water absorption behavior was studied through gravimetric tests at 35, 70, and 130 ∘C. Fiber-free PBT was also studied at 35 ∘C for comparison purposes. The effect of water and temperature on the mechanical properties was analyzed through bulk tensile tests. The material was tested for the three temperatures in the as-supplied state (without drying or aging). Afterwards, PBT-GF30 was tested at room temperature following water immersion at the three temperatures. Chemical changes in the material were also analyzed through Fourier-transform infrared spectroscopy (FTIR). It was concluded that the water diffusion behavior is Fickian and that PBT absorbs more water than PBT-GF30 but at a slightly higher rate. However, temperature was found to have a more significant influence on the rate of water diffusion of PBT-GF30 than fiber content did. Temperature has a significant influence on the mechanical properties of the material. Humidity contributes to a slight drop in stiffness and strength, not showing a clear dependence on water uptake. This decrease in mechanical properties occurs due to the relaxation of the polymeric chain promoted by water ingress. Between 80 and 85 ∘C, after water immersion, the FTIR profile of the material changes, which suggests chemical changes in the PBT. The water absorption was simulated through heat transfer analogy with good results. From the developed numerical simulation, the minimum plate size to maintain the water ingress unidirectional was 30 mm, which was validated experimentally.

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“…The water ingress behavior of materials is not described by a single universal rule. However, in the majority of the cases, the Fick’s law can be used to fit the empirical results [ 8 , 9 , 10 , 11 , 12 ]. This law is defined by the coefficient of diffusion, D , which is related to the diffusion rate, and the water uptake at saturation,

.…”

Section: Introductionmentioning

confidence: 99%

Effect of the Interface/Interphase on the Water Ingress Properties of Joints with PBT-GF30 and Aluminum Substrates Using Silicone Adhesive

et al. 2023

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The aim of this work is to analyze the difference between silicone/composite and silicone/metal interphases, both in terms of water diffusion behavior and failure of the aged joints. For that, silicone joints with two different suhbstrates were prepared. The substrates were polybutylene terephthalate with 30% of short glass fiber (PBT-GF30) and 6082-T6 aluminum. It is assumed that the water uptake of the joints is equal to the water uptake of the substrate, adhesive, and interphase. Therefore, knowing the first three, the last could be isolated. To study the water diffusion behavior of the complete joint, rectangular joints were prepared, immersed in water and their water uptake was measured. The water immersion was conducted at 70∘C. It was concluded that the aluminum/silicone joints absorbed more water through the interphase region than the PBT-GF30/silicone joints, since the difference between the expected water uptake and the experimentally measured mass gain is significantly higher, causing adhesive failure of the joint. The same was not observed in the PBT-GF30/silicone, with a more stable interphase, that does not absorb measurable quantities of water and always exhibits cohesive failure.

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Short glass fibre reinforcedpoly(butylene terephthalate) Part 1 –Microstructural characterisation and kinetics of moisture absorption

Cited by 12 publications

References 16 publications

Effect of hydrothermal environment on moisture absorption and mechanical properties of wood flour–filled polypropylene composites

Effect of hydrothermal environment on moisture absorption and mechanical properties of wood flour–filled polypropylene composites

Effect of Water Ingress on the Mechanical and Chemical Properties of Polybutylene Terephthalate Reinforced with Glass Fibers

Effect of the Interface/Interphase on the Water Ingress Properties of Joints with PBT-GF30 and Aluminum Substrates Using Silicone Adhesive

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