Journal
MATERIALS & DESIGN
Volume 46, Issue -, Pages 688-695Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.matdes.2012.11.034
Keywords
Polymer-matrix composites; Mechanical properties; Microstructures; Thermoplastics
Categories
Funding
- Chinese Academy of Sciences [KGCX2-EW-210]
- National 863 plan [2012AA03A206]
- National Key Basic Research and Development Program (973 Program) [2010CB631104]
- National Natural Science Foundation of China [51103173]
- Zhejiang Provincial Natural Science Foundation of China [Y4110609]
- Ningbo Science and Technology Project [2011B1015]
- Ningbo Natural Science Foundation [2011A610113, 2011A610115, 2012A610090]
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Continuous glass fiber (GF) reinforced anionic polyamide-6 (APA6) composites were prepared via in situ ring-opening polymerization of caprolactam monomers. The effects of catalyst content, polymerization temperature and time on the viscosity average molar mass (M-v) and degree of crystallinity (X-c) were investigated in detail. The final mechanical properties of GF/APA6 composites were also studied. The results indicated that both high molecular weight and the high degree of crystallinity of resin matrix lead to the high mechanical properties of composites. Furthermore, the mechanical test results showed that the composites of plain woven fabric had tensile strength of 434 MPa and flexural strength of 407 MPa. The morphologies of tensile fracture surfaces of the composites specimens were observed through Scanning Electron Microscope (SEM). The SEM analysis showed that many disorganized nanofiber crystals appear in the tensile fracture surfaces, which improve the mechanical properties of the matrix resin. The mechanical properties of the composites with different post-heat treatments were further investigated. The mechanical properties of the composites are significantly reduced after quenching treatment, but hardly improved after annealing. (C) 2012 Elsevier Ltd. All rights reserved.
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