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A novel method for the manufacturing of thick composites

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A novel method for the manufacturing of thick composites

Jiang, Yijun (2004) A novel method for the manufacturing of thick composites. Masters thesis, Concordia University.

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Abstract

Due to the nature of exothermic reaction and high thermal resistance, processing thick-sectioned composites can be very difficult. Instead of expensive and time consuming trial and error methods, pre-catalyzing fabric technique applied to the hand lay-up process is very effective to decrease exothermal peak dramatically. By applying the peroxide catalyst to the fabric, this technique can slow down the polymerization reaction rate and subsequently reduce the internal temperature during curing. In this study, two kinds of pre-catalyzing methods were developed: one used polystyrene as the catalyst binder; another used epoxy resin as the binder. The experimental results indicate that the pre-catalyzing method using polystyrene as the binder can control the peak exothermic temperature to be under 30{493}C, and the method using epoxy binder can limit that temperature to be below 39{493}C. Latter method has shorter curing time than former one. Both methods can reduce the temperature gradient greatly. The degree of cure for both methods can be more than 87% with low exothermic temperature after the cure, and the laminate is rigid enough with this degree of cure to be used for further post cure. The degree of cure can be improved to be higher than 97% by leaving the samples for more than five weeks in ambient temperature. Compared with polystyrene binder which made the interlaminar shear strength decrease by 12.8%, the epoxy resin binder has the better characteristic not to exhibit this decrease, and the short beam shear tests show no degradation of ILSS.

Divisions:Concordia University > Faculty of Engineering and Computer Science > Mechanical and Industrial Engineering
Item Type:Thesis (Masters)
Authors:Jiang, Yijun
Pagination:xiii, 144 leaves : ill. ; 29 cm.
Institution:Concordia University
Degree Name:M.A. Sc.
Program:Mechanical and Industrial Engineering
Date:2004
Thesis Supervisor(s):Hoa, Suong V
ID Code:7875
Deposited By:Concordia University Libraries
Deposited On:18 Aug 2011 14:09
Last Modified:18 Aug 2011 14:09
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