Improvement of dimensional stability of nylon-6 block copolymer using phenolic resin by reaction injection molding
✍ Scribed by M. J. Lozano-González; E. A. González-De Los Santos; A. F. Johnson; S-W. Tsui
- Publisher
- John Wiley and Sons
- Year
- 1998
- Tongue
- English
- Weight
- 263 KB
- Volume
- 70
- Category
- Article
- ISSN
- 0021-8995
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✦ Synopsis
In order to decrease moisture uptake and hence provide rigidity and dimensional stability in a nylon-6 block copolymer (NBC), powdered phenolic resin was incorporated into the formulation as a filler and processed by reaction injection molding. A novolac resin was cured with hexamethylenetetramine to produce the phenolic resin, which was modified with diethylamine in order to remplaced the OOH groups by diethylamine groups. 5% by weight of modified and unmodified powdered phenolic resin was used as a filler in the nylon-6 block copolymers, and reinforced-nylon-6 block copolymer plaques were produced by reaction injection molding at 145°C. The materials were characterized by dynamic mechanical thermal analysis (DMTA), and their flexural modulus, impact test, and dimensional stability were evaluated. In unmodified phenolic-resin-reinforced nylon-6 block copolymer, water absorption was decreased by 90% compared with the NBC without filler. Two mechanisms of interaction between the NBC and the phenolic resin have been proposed.