Paper Information

Journal:   IRANIAN POLYMER JOURNAL (ENGLISH)   2004 , Volume 13 , Number 5; Page(s) 389 To 396.
 
Paper: 

SHRINKAGE, CURE CHARACTERIZATION AND PROCESSING OF UNSATURATED POLYESTER RESIN CONTAINING PVAC LOW-PROFILE ADDITIVE

 
 
Author(s):  HAYATY M., BEHESHTI M.H.*
 
* Department of Composite, Iran Polymer and Petrochemical Institute, Tehran, I.R. Iran
 
Abstract: 

With the development of composite manufacturing processes, such as low-pressure compression moulding of sheet moulding compounds (SMC), resin transfer moulding (RTM) and vacuum infusion moulding processes, low-shrinkage resin which can be processed at low temperatures have attracted considerable interest from the composite industry. In this paper the effect of polyvinyl acetate (PVAc) as a low profile additive (LPA) on shrinkage control of an iso unsaturated polyester resin has been investigated and cure behaviour, morphology and mechanical properties of this system has been studied. Our studies show that the maximum exothermic temperature and the rate of cure decreases with increasing the PVAc concentration. The PVAc content has a significant effect on the resin viscosity. It was found that there are two transitions for UP resin containing PVAc cured at low temperatures. The PVAc content is effective for shrinkage control only in a concentration between these two transitions. Experimental results showed that the mechanical properties of this system decreases by increasing the PVAc content.

 
Keyword(s): SHRINKAGE, UNSATURATED POLYESTER, POLYVINYL ACETATE, CURING, COMPOSITE
 
References: 
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