Polyester resins glass content

Figure 6. Temperature and conversion profiles at different radii for polyester resin - glass fiber with a content of fiber of 0.45 (See Ref. 23) Note (a) V,=0.508xl0 m/s (b) V,=1.524x1 m/s...

Whereas McGee [188] did not verify any effect of particulate fillers (i.e., glass, calcium carbonate, and aluminum) on the reaction kinetics, Lem and Han [185], working with calcium carbonate and clay in an unsaturated polyester resin, concluded that the reaction rate increases by increasing the filler content. 

Two resins were used to do the first study on laminate construction. The first was a brominated epoxy vinyl ester resin with antimony pentoxide and the second was a brominated unsaturated polyester resin. They were both promoted to cure at room temperature with methyl ethyl ketone peroxide catalyst. The panels were then postcured at 250°F (121°C) for 8 h. Panels were prepared that varied in glass content from 25% to 70% and panel thickness varying from 0.05 in. to 0.25 in. and were tested at the same testing facility. A summary of the FSI test data for the first set of panels tested are shown in Figures 23.1 and 23.2. This graph in Figure 23.1 plots the FSI value versus the panel thickness. This data would indicate that the thickness of the test panel has no effect on the measured... 

Various UPE resins based on recycled poly ethylene terephthalate(PET) were prepared and the properties of the polymer mortar made with the UPE as well as those of the cured resin itself were investigated. It was found that degree of unsaturation of the resins was the most important property affecting thermal and mechanical properties of the cured resin and PM. The cured unsaturated polyester resin or polymer mortar made from resins of higher unsaturation, i.e., less PET content or adipic acid content in the resin, showed higher glass transition temperatures,... 

The choice of fibrous reinforcements can have as important an effect on moisture and hydrolysis resistance as the resin matrix, especially when polyester resins are used. Low-alkaU content E-glass is almost universally used for glass reinforcements and is coated with an organosilane size to protect it, as well as to improve the bond between it and the resin. If chopped strand glass mat is utilized as a reinforcement, the type of binder... 

The molecular mobility in the polymers was determined by dielectric studies. Polymer films 300—500 pm thick cast between glass plates at room temperature were used. Dielectric measiu ements were made using the E8-4 ac bridge within a broad temperature range. The superimposed frequency of the external electric field was 1 kHz. The dependence of the coefficient of transmission of the cured polyester resin on the OP-10 content was determined using the FEC-56M photoelectric calorimeter. 

For applications with low glass content, the choice of resin is more likely to depend upon cost (polyester being the cheapest), processability or chemical/environmental resistance (Chapter 9). 

Chemical resistance of glass fiber-reinforced polyester resins depends in particular on polyester resin composition, composition and the amount of monomers used, glass composition, laminar structure, the ratio of resin to glass content in individual layers and, last but not least, on processing [32],... 

Figure 5.359 Exposure of glass fiber-reinforced, crosslinked polyester resin (bisphenol-based unsaturated polyester resin with randomly oriented E-glass fiber-reinforced mat) in hot water pure resin content was calculated as the product of change in pure resin with resin content in the glass fiber reinforced material Wg = weight before exposure, = weight after exposure to water, fKrf = weight after re-drying [874]...

The effects of solvent exposure on the viscoelastic properties of several vinyl ester resins (phenohc-novolac epoxy, propoxylated bisphenol-A fu-marate, urethane and bisphenol-A epoxy based) and various unsaturated polyester resins (terephthalic or isophthaUc acid with a standard glycol based) containing 10wt% glass fiber were studied [130]. The results of dynamic mechanical analysis showed that the influence of exposure time to the solvent as well as the influence of temperature depended on the styrene content and chemical composition of the studied resins, while the amount of cobalt octoate used for the synthesis as the accelerator had no influence on the viscoelastic properties of the prepared materials after solvent exposure. It was also found that not fully cured urethane vinyl ester and the terephthahc acid-based unsaturated polyester resins showed excellent resistance to sulfuric acid exposure. However, interactions between the tested resins and petroleum could possibly occur through intermolecular bonding between the non-polar chains of the cured resins and the solvent. 

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