Please use this identifier to cite or link to this item: https://ir.swu.ac.th/jspui/handle/123456789/14921
ชื่อเรื่อง: Thermomechanical characteristics of benzoxazine-urethane copolymers and their carbon fiber-reinforced composites
ผู้แต่ง: Rimdusit S.
Liengvachiranon C.
Tiptipakorn S.
Jubsilp C.
Keywords: Bending strength
Copolymerization
Copolymers
Curing
Fibers
Glass transition
Interchanges
Plastic products
Reinforcement
Resins
Thermosets
Toluene
Benzoxazine
Binary systems
Carbon fiber composite
Composites
Cross-ply
Curing of polymers
Degradation temperatures
Different structure
Diphenylmethane diisocyanate
Fiber-reinforced composite
Flexural modulus
Flexural strength
Glass transition temperature
Isophorone diisocyanate
Polybenzoxazine
Prepolymer
Processable
PU systems
Thermo-mechanical characteristics
Toluene diisocyanate
Urethane elastomers
Carbon fibers
carbon fiber
copolymer
degradation
fiber reinforced composite
glass transition temperature
mechanical property
temperature effect
thermal property
วันที่เผยแพร่: 2009
บทคัดย่อ: Copolymers of polybenzoxazine (BA-a) and urethane elastomer (PU) with three different structures of isocyanates [i.e., toluene diisocyanate (TDI), diphenylmethane diisocyanate, and isophorone diisocyanate ], were examined. The experimental results reveal that the enhancement in glass transition temperature (Tg) of BA-a/PU copolymers was clearly observed [i.e., Tg of the BA-a/PU copolymers in 60 : 40 BA-a : PU system, for all isocyanate types (Tg beyond 230°C) was higher than those of the parent resins (165°C for BA-a and -70°C for PU)]. It was reported that the degradation temperature increased from 321°C to about 330°C with increasing urethane content. Furthermore, the flexural strength synergism was found at the BA-a. : PU ratio of 90 : 1.0 for all types of isocyanates. The effect of urethane prepolymer based on TDI rendered the highest Tg, flexural modulus, and flexural strength of the copolymers among the three isocyanates used. The preferable isocyanate of the binary systems for making high processable carbon fiber composites was based on TDI. The flexural strength of the carbon fiber-reinforced BA-a : PU based on TDI at 80 wt % of the fiber in cross-ply orientation provided relatively high values of about 490 MPa. The flexural modulus slightly decreased from 51 GPa for polybenzoxazine to 48 GPa in the 60 : 40 BA-a. : PU system. © 2009 Wiley Periodicals, Inc.
URI: https://ir.swu.ac.th/jspui/handle/123456789/14921
https://www.scopus.com/inward/record.uri?eid=2-s2.0-67649500003&doi=10.1002%2fapp.30344&partnerID=40&md5=89785a3f5bedc461a9ac4d2bc9d26ff2
ISSN: 218995
Appears in Collections:Scopus 1983-2021

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