Solubility parameters terpolymers

The anomalous effect of the last two rubbers in the table with their low solubility parameters is possibly explained by specific interaction of PVC with carbonyl and carboxyl groups present respectively in the ketone- and fumarate-containing rubbers to give a more than expected measure of compatibility. It is important to note that variation of the monomer ratios in the copolymers and terpolymers by causing changes in the solubility parameter and eompatibility will result in variation in their effect on impact strength. 

The relative initial ratio of acrylonitrile to butadiene and degree of conversion of nitrile to amidoxime are directly related to the resultant film s solubility parameter and glass transition temperature. Ideally, the concentration of amidoxime functional groups would be maximized while the coating s solubility parameter is matched to the vapor to be detected and the glass transition temperature is kept below room temperature. In practice, the conversion limitations are set by the reaction conditions of limited polymer solubility, reaction temperature and time. Three terpolymers of varying butadiene, acrylonitrile and amidoxime compositions were prepared as indicated in Table 1. 

The infrared spectra of the butadiene-acrylonitrile copolymer and butadiene-acrylonitrile-acrylamidoxime terpolymers are presented in Figure 2. The amidoxime specific bands appear at 3480 and 3380 cm-l (NH2 stretching) and at 1660 cm"l (C =N stretching) (1 2 ). The glass transition temperatures and solubility parameters of the corresponding polymers are also presented in Table 1. As the aerylamidoxime content increases from 3 to 7 to 45 mole percent, the... 

Fig. 5 MSF and DMMP Vapor Concentration Dependence of SAW Device Coated with 3,7 and 45% Acrylamidoxime Terpolymers and Correlation with Terpolymer Glass Transition Temperature and Solubility Parameter.

Table 5. Composition and solubility parameters of acrylic terpolymers ...

Elastomers which have been found to effectively toughen epoxies include acrylic, carboxyterminated butadiene acrylonitrile, polyurethane, certain terpolymers as well as polysiloxane. Addition of two mbbers with different solubility parameters to epoxy can yield a phase separated material with particles oftwo different sizes. 

Finally the morphologies of ternary linear block copolymers and heteroarm star terpolymers are compared. Here systems containing I or B are also compared, since these two polymers show rather similar interactions toward the other blocks (see Table 2 for solubility parameters). Figure 22 shows in the left column symmetrically composed SIM heteroarm star terpol5uners (134) and linear BSM and SBM triblock copolymers (76). In the right column corresponding SBV (135) and SIV (144) heteroarm star terpolymers are compared with their linear compositional... 

How is the solubility parameter approach applied to terpolymer-terpoly-mer miscibility ... 

How are binary blends of copolymer and terpolymer with one common monomer treated using the solubility parameter approach ... 

Frequently it is necessary to combine materials having quite dissimilar solubility parameters, and often differing in modulus as well. An important example, the manufacture of tires, is discussed in the chapter, Bonding Textiles to Rubber. Use is made of a hybrid adhesive, RFL, containing heat-resistant resorcinol-formaldehyde for good attachment primarily to the polar, high modulus fiber, plus an elastomer of moderate solubility parameter, butadiene-styrene-vinyl pyridine terpolymer latex, mainly for the rubber. 

Table 2. Studies of the solubility parameters of the three blocks and the diblock copol3miers incorporated into the composition of the terpolymers...

Figure 15. Schematic representation of the phase separation in multiblock co- and terpolymers depending on the solubility parameters of the blocks ( A, B, C - phases AB, AC, BC, ABC - interphases)...

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