Tests of Theoretical Modulus Values—Model Networks

Tests of Theoretical Modulus Values—Model Networks 

Quantitative tests of the absolute modulus value from kinetic theory [Eq. (7.2)] are quite scarce independent determination of the network strand concentration is generally the difficulty. Schaefgen and Flory (278) prepared model 

Prins and co-workers 280) reported moduli on polystyrene networks which had been formed by adding small amounts of divinyl benzene to preformed polystyryl dianions. The gels were dried, reswelled to equilibrium in benzene and tested in simple compression. The equation for G in this case becomes  

Allen and co-workers 280a) have recently prepared and studied a series of model polystyrene networks. These networks were formed from narrow distribution polystyrenes (M = 70000-240000) containing small but known amounts of secondary amine side groups. The amines were coupled in solution by reaction with diisocyanates, resulting in networks with known values of vc (Af =7000-17000). Moduli were determined for the networks at the same diluent 

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Tests of Theoretical Modulus Values—Model Networks... 

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