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Thermomechanical properties of arylamine-based benzoxazine resins alloyed with epoxy resin

หน่วยงาน จุฬาลงกรณ์มหาวิทยาลัย

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ชื่อเรื่อง : Thermomechanical properties of arylamine-based benzoxazine resins alloyed with epoxy resin
นักวิจัย : Pathomkorn Kunopast
คำค้น : Epoxy resins -- Thermal properties
หน่วยงาน : จุฬาลงกรณ์มหาวิทยาลัย
ผู้ร่วมงาน : Sarawut Rimdusit , Chulalongkorn University. Faculty of Engineering
ปีพิมพ์ : 2551
อ้างอิง : http://cuir.car.chula.ac.th/handle/123456789/21593
ที่มา : -
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Thesis (M.Eng.)--Chulalongkorn University, 2008

In this research, effects of addition of epoxy resin into various arylamine-based benzoxazine resins, i.e. aniline, m-toluidine, and 3,5-xylidine systems, which designated as BA-a, BA-mt, and BA-35x, respectively, have been investigated. Processing windows of BA-35x, BA-mt, and BA-a were found to be widened with the amount of the epoxy resin. Gel points of benzoxazine-epoxy resin mixtures can be well predicted by an Arrhenius equation e.g. the gel time of BA-35x alloyed with epoxy resin at composition 70:30 mass ratio can be estimated by t[subscript gel]=0.7012×10⁻⁷ exp(10.563/T). An addition of the epoxy to the polybenzoxazines increased the crosslinked density of the resulting polymer alloys which influenced their major properties. From dynamic mechanical analysis, T[subscript g] values obtained from the peaks of loss moduli of BA-a and BA-mt alloyed with epoxy resin were found to show a synergistic behavior with the maximum T[subscript g] value at the benzoxazine-epoxy composition of 80:20 mass ratio with the T[subscript g] values of 182℃ for BA-a and 213℃ for BA-mt systems. However, in the BA-35x and epoxy binary mixture, the decreasing trend in T[subscript g] from 241℃ to 223℃ with an addition of epoxy resin up to 40wt% was observed. In benzoxazine-epoxy polymer alloys based on m-toluidine, the degradation temperature at 5% weight loss was found to be the highest value among polybenzoxazine-epoxy alloys, i.e. at composition 80:20 mass ratio, T[subscript d] was found to be 357℃ for BA-mt system, 352℃ for BA-35x system, and 345℃ for BA-a system. In addition, the flexural strength and the flexural strain at break of all three binary systems were found to increase with increasing amount of the epoxy i.e. the flexural strength up to 182 MPa for BA-a/Epoxy at 60:40 mass ratio (compared with about 141 MPa of the neat BA-a) 161 MPa of BA-mt/Epoxy from 129 MPa of the neat BA-mt, and 155 MPa of BA-35x/Epoxy from 112 MPa of the neat BA-35x.

บรรณานุกรม :
Pathomkorn Kunopast . (2551). Thermomechanical properties of arylamine-based benzoxazine resins alloyed with epoxy resin.
    กรุงเทพมหานคร : จุฬาลงกรณ์มหาวิทยาลัย.
Pathomkorn Kunopast . 2551. "Thermomechanical properties of arylamine-based benzoxazine resins alloyed with epoxy resin".
    กรุงเทพมหานคร : จุฬาลงกรณ์มหาวิทยาลัย.
Pathomkorn Kunopast . "Thermomechanical properties of arylamine-based benzoxazine resins alloyed with epoxy resin."
    กรุงเทพมหานคร : จุฬาลงกรณ์มหาวิทยาลัย, 2551. Print.
Pathomkorn Kunopast . Thermomechanical properties of arylamine-based benzoxazine resins alloyed with epoxy resin. กรุงเทพมหานคร : จุฬาลงกรณ์มหาวิทยาลัย; 2551.