## Abstract The effects of reactive poly(methyl methacrylate) (PMMA) and poly(vinyl acetate)β__block__βPMMA as lowβprofile additives (LPAs) on the volume shrinkage characteristics and internal pigmentability for lowβshrink unsaturated polyester (UP) resins during curing at 110Β°C were investigated.
Cure of polyester resins. I
β Scribed by G. S. Learmonth; F. M. Tomlinson; J. Czerski
- Publisher
- John Wiley and Sons
- Year
- 1968
- Tongue
- English
- Weight
- 345 KB
- Volume
- 12
- Category
- Article
- ISSN
- 0021-8995
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β¦ Synopsis
The application of physical test methods to studying the crosslinking of unsaturated polyesters is reviewed. Experimental work on changes of hardness and electrical resistivity is described and it is shown that these are not mutually related, due to continual mobility of ionic conditions after the resin network is immobilized by gelation.
π SIMILAR VOLUMES
The copolymerization reaction between unsaturat,ed polyesters and styrene has been studied by a torsional pendulum. The accuracy of the dynamic-mechanical measurements obtained is discussed briefly, and the results are compared with those of previous work on the change of hardness during cure.
A research area that has obtained increasing interest during the last decade concerns improvement of macromolecular properties by changes in the macromolecular architecture. One group of these materials is dendritic polymers, which are highly branched structures exhibiting very different properties
In this work, the curing kinetic of an unsaturated polyester resin, mixed with styrene as curing agent, was studied by means of diffential scanning calorimetry (DSC) and infrared (IR) spectroscopy. Investigations were made in situ during curing and post-curing periods. The enthalpy ( DH cop ) charac