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Hard segment concentration, effects

Effects of Hard-Segment Concentration on Copolymer Properties... [Pg.136]

There are several ways of changing the properties of segmented polyurethane copolymers. In this study, the chemical structure of the hard segments was changed to adjust the modulus of the adhesive. Further fine tuning is possible by varying the concentration of the different blocks. For example, the 87-series adhesives have a lower modulus than the 88-series adhesives because their hard segment concentration is lower. Studies of concentration effects (16) have shown that much wider variation of modulus is possible tTian was achieved here. [Pg.360]

Seefried, C.G., Koleske, J.V., and Critchfield, F.E. (1975) Thermoplastic urethane elastomers, n. Effects of variations in hard-segment concentration. Journal of Applied Polymer Science, 19, 2503-2513. [Pg.210]

The amorphous phase composition may also be modified by use of mixed short-chain ester segments. Partial replacement of the 4GT hard segment with another results both in decreasing 4GT concentration and in reducing its overall mole fraction. The effects on modulus are shown in Figure 15 for the PTMEG-T/4GT/4GI system. As the tere-phthalate mole fraction is decreased in a polymer having constant total... [Pg.64]

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