Mechanical properties of bisphenol

Polynuclear Phenol—Glycidyl Ether-Derived Resins. This is one of the first commercially available polyfunctional products. Its polyfunctionahty permits upgrading of thermal stabiUty, chemical resistance, and electrical and mechanical properties of bisphenol A—epoxy systems. It is used in mol ding compounds and adhesives. 

In the early literature it is suggested that polycarbonates can be easily plasticized with common plasticizers. Plasticization of polycarbonate has been investigated by Kozlov et al. (12). These authors described the influence of plasticization on softening points and mechanical properties of bisphenol A polycarbonates. They conclude that the behavior of plasticized polycarbonate is similar to that encountered for most amorphous polymers. The influence of crystallization effects promoted by the plasticizer was not taken into account. 

Investigation of the mechanical properties of bisphenol A polycarbonate (BPA-PC) and tetramethyl bisphenol A polycarbonate (TMBPA-PC) has led to... 

Table VII. Thermal—Mechanical Properties of Bisphenol A Modified CTBN—Epoxy System...

Figure 4. Dynamic mechanical properties of bisphenol-linked phthalonitrile polymers. Key ----------------, bisphenol A and-, bisphenolS.

Kalkar, K., and Roy, N. K. 1992. D5mamic mechanical properties of bisphenol-A polycarbonate/poly (p-t-butylphenol formaldehyde) blends. Polymer Science Contemporary Themes, II, Tata New Delhi McGraw-Hill.. 

The room temperature mechanical properties of bisphenol A, bisphenol S, and biphenol-based polysulfones are given in Table 4. The elongation at yield of these polymers is highest for PPSF, while PES offers slightly higher tensile strength than the other two polymers. Otherwise, the tensile and flexural properties for these three polymers are quite comparable. The main distinguishing... 

Table 2 Improvement of mechanical properties of bisphenol, and peroxide-cured...

This post-cme step is required to reach the best vulcanizate properties (tensile strength, modulus at 50 or 100% elongation, compression set resistance, elongation at break) [28,40,108,111]. Tables [35] shows the improvement of compression set resistance with post curing, for fom samples containing poly(VDF-ter-HFP-ter-TFE) terpolymer crosslinked with a peroxide [2,5-bis(t-butylperoxy)-2,5-dimethylhexyne] in the presence of triaUyhso-cyanurate [35,108,112,113[. Table 2 [35[ presents the improvement of some mechanical properties of bisphenol and peroxide cured systems with post cure. 

Numerous avenues to produce these materials have been explored (128—138). The synthesis of two new fluorinated bicycHc monomers and the use of these monomers to prepare fluorinated epoxies with improved physical properties and a reduced surface energy have been reported (139,140). The monomers have been polymerized with the diglycidyl ether of bisphenol A, and the thermal and mechanical properties of the resin have been characterized. The resulting polymer was stable up to 380°C (10% weight loss by tga). 

The mechanical properties of poly(methyl methacrylate), PMMA, have been studied for quite a long time and, in addition to its industrial interest, PMMA constitutes a kind of reference material. Indeed, among the amorphous linear polymers it represents an intermediate between the very brittle polystyrene and the tough bisphenol A polycarbonate considered in Sect. 4. Furthermore, as shown in [1] (Sect. 8.1), the molecular motions responsible for its large p transition are precisely identified, as well as the nature of the cooperativity that develops in the high temperature range of the p transition. 

If a rubber-like polymer is used as the vinyl polymer, this IPN will show good damping properties at elevated temperatures. So, butyl acrylate, ethylene glycol dimethacrylate, phenolic novolac, and bisphenol A type epoxies were used as IPN components. The dynamic mechanical properties of these IPNs were examined first, because the loss tangent is very important to damping properties. Then the damping properties of IPN and commercial chloroprene rubber were measured at various temperatures. 

By solubilisation of propoxylated bisphenol A with the structure 15.28, in a sucrose-based polyether polyol for rigid foams, an homogeneous mixture is obtained [29]. The viscosities of these mixtures increase with the content of propoxylated bisphenol A. From these mixtures rigid PU foams were obtained. Due to the aromaticity introduced by the propoxylated bisphenol A, the physico-mechanical properties of the resulting rigid PU foams were superior to the rigid PU foams made with the sucrose-based poly ether polyol alone [29]. 

Obviously, there are a very large number of copolycondensation combinations of various glycols or diphenols with different dicarboxylic acids. For example, polymers from terephthalic acid, isophthalic acid, and bisphenol A in the molar ratios of 1 1 2 are offered commercially under the name poly-arylates. The mechanical properties of these amorphous polymers correspond to those of a typical engineering plastic. 

Extensive studies of the dynamic-mechanical properties of a number of different polysulfones has been reported by Robeson et al. [77] and by Aitken et al. [78] Most of studies reported in the literature have focused on the two commercially important polysulfones — bisphenol-A polysulfone (PSF)... 

Patel SR, Patel RG, Carbon-fiber reinforced epoxy composites, Polym Int, 30(3), 301-303, 1993. Soni HK, Patel RG, Patel VS, Structural, physical and mechanical-properties of carbon-fiber-reinforced composites of diglycidyl ether of bisphenol-A and bisphenol-C, Angewandte Makromolekulare Chemie, 211, 1-8, 1993. 

The effect of compatibility, morphology, rfieology, mechanical properties of mixes of polysulfones and liquid-crystal polymers are studied in Refs. [203-205]. There are several contributions on the methods of synthesizing of copolymers of polysulfones and polyesterketones and on the production of mixes [206-210]. The method for the synthesis of aromatie copolyestersulfoneketones proposed in Ref. [206] allows one to decrease the number of components used, to lower the demands to the concentration of moist in them and to increase the safety of the process. The method is in the interaction without aseotropoformer in envirorunent of dimethylsul-fone of bisphenols, dihaloydarylenesulfones and (or) dihaloydarylenek-etones and alkali agents in the shape of crystallohydrated of alkali metal carbonated and bicarbonates. All components used are applicable without preliminary drying. 

---