Nylon 6‐Polyesteramide Block Copolymers (NBC) and NBC/Phenolic Resin Composites, 1

Abstract

Summary: A series of NBC/phenolic resin composites, containing 0, 1, 3, 5 or 7 wt.‐% of a powdered phenolic resin of different particle diameter, was prepared by the reaction injection molding (RIM) process. It was determined by SEM analysis that there exists a strong interaction between particles and matrix and that such interaction occurs through hydrogen‐type bonds as determined by FTIR analysis. According to the results it is thought that the glass transition temperature of the NBC/phenolic resin composites depends on two competing factors: the rigidity promoted by the hard solid filler and the flexibility imparted by the nylon 6 amorphous phase, whose proportion becomes more important with increasing amounts of phenolic resin particles. The elastic and flexural moduli of the NBC were improved by the addition of phenolic resin confirming the reinforcing effect of this filler. On the contrary, the impact strength diminishes with increasing amounts of phenolic resin, although this property is strongly dependent on the particle diameter.SEM micrograph of the nylon 6‐polyesteramide block copolymer (80/20).magnified imageSEM micrograph of the nylon 6‐polyesteramide block copolymer (80/20).

Polymers and Related Composites via Anionic Ring-Opening Polymerization of Lactams: Recent Developments and Future Trends

“…Although the water uptake of NBC is lower than that of PA-6, efforts were made to reduce it further and to increase its resistance to hydrothermal aging. Improvements in this relation were achieved by incorporating phenolic resin [ 66 , 67 ]. According to the related patent [ 68 ] the MW of the polyol is higher than 2 kDa.…”

Modification of phenolic resin composites by hyperbranched polyborate and polybenzoxazine

“…Besides, there are quite a few approaches in the toughening modification process, including the introduction of toughening groups (such as etherification of phenol groups, long methylene sequences or other flexible structures between phenol nucleus) into the PR; adding elastomers (such as natural rubber, butyl rubber, nitrile rubber, styrenebutadiene rubber, or thermoplastic resin); or forming semi-interpenetrating networks together with thermoplastic resins. However, it is unlikely to avoid the loss of thermal resistance and processability in these toughening methods [12][13][14][15]. Traditional modification methods are difficult to strike a balance between the thermal resistance and toughness of PR, especially in the area of ablation resistance.…”