Journal
JOURNAL OF REINFORCED PLASTICS AND COMPOSITES
Volume 30, Issue 6, Pages 488-498Publisher
SAGE PUBLICATIONS LTD
DOI: 10.1177/0731684410397898
Keywords
glass fiber composites; plasticization effect; thermal properties; mechanical properties; dynamic mechanical properties
Categories
Funding
- [33-02-03-3054]
- [RG092/10AFR]
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Unreinforced- and glass fiber-reinforced-polyamide 6,6 specimens were subjected to dry, 50% RH, and wet conditions. FLD study showed that more fiber degradation occurred during processing of the composites with higher fiber loading. TGA results revealed that about 2% and 5% levels of moisture have been absorbed by the specimens subjected to 50% RH and wet conditions, respectively. From DSC results, with moisture uptake, there were no significance changes in the melting temperature, crystallization temperature, and enthalpy of crystalline; however, degree of crystallinity and enthalpy of melting decreased. Tensile strength, tensile modulus, flexural strength, and flexural modulus decreased with moisture uptake, while tensile strain and flexural displacement increased. DMA study showed that tan delta at room temperature and tan delta maxima increased with moisture absorption, while temperatures at maximum tan delta in alpha-and beta-transition regions decreased.
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