Mechanical properties, thermal stability, and flame retardance of pultruded fiber-reinforced poly(ethylene oxide)-toughened novolak-type phenolic resin

• Published in: Journal of applied polymer science Vol. 69; no. 6; pp. 1129 - 1136
• Main Authors: Ma, Chen-Chi M., Lee, Chih-Tsung, Wu, Hew-Der
• Format: Journal Article
• Language: English
• Published: New York John Wiley & Sons, Inc 08.08.1998; Wiley
• Subjects: Applied sciences; Composites; Exact sciences and technology; flame retardance; Forms of application and semi-finished materials; mechanical properties; novolak-type phenolic resin; poly(ethylene oxide); Polymer industry, paints, wood; pultrusion; Technology of polymers; thermal stability; Strengthening; Fiber reinforced material; Mechanical properties; Tensile property; Experimental study; Phenolics; Composite material; Thermal stability; Thermal properties; Ethylene oxide polymer; Impact strength; Novolac; Flammability; Glass fiber
• ISSN: 0021-8995; 1097-4628
• DOI: 10.1002/(SICI)1097-4628(19980808)69:6<1129::AID-APP10>3.0.CO;2-O

The mechanical properties (flexural modulus, static tensile strength, notched Izod impact strength), miscibility, thermal stability, and flame retardance of a poly(ethylene oxide) (PEO)‐toughened phenolic resin glass pultruded composite were investigated. The mechanical properties of a pultruded glass fiber‐reinforced modified phenolic resin composite increased while the soft segment of PEO absorbs the loads in the network of brittle phenolic resin. The phenolic/PEO blend is completely miscible, from the results of differential scanning calorimetry. Its thermal degradation temperature is always higher than 370°C and decreased with increasing PEO content. The morphology of the interface between the fiber and matrix is well wetted‐out with increasing PEO content from the result with a scanning electron microscope (SEM). The modified phenolic composite also shows excellent flame retardance that is UL‐94, V‐0, and the limited oxygen index is more than 55. © 1998 John Wiley & Sons, Inc. J Appl Polym Sci 69: 1129–1136, 1998