Crosslinked amorphous polymers

Monnerie, L., Laupretre, F. and Halary,. L. Investigation of Solid-State Transitions in Linear and Crosslinked Amorphous Polymers. Vol. 187, pp. 35-213. 

Hoeve, C. A. J., A. Ciferri, and P. J. Flory Elasticity of crosslinked amorphous polymers in swelling equilibrium with diluents. J. Polymer Sci. 45, 235 (1960). 

The liquid may be a good or poor solvent for the polymer. For this type of system a theoretical relation can be obtained for K by applying the Flory equation of state theory ( -i) or lattice fluid theory (7-10) of solutions. An important prerequisite for the application of these theories is for the polymer to behave as an equlibrium liquid. This condition is generally valid for a lightly crosslinked, amorphous polymer above its Tg or for the amorphous component of a semi-crystalline polymer above its Tg. 

If the swelling is appreciable, as it might be for a very good solvent, corrections can be made to Eq. (21) for both crosslinked amorphous polymers (13.) and semi-crystal line polymers (14 15)-Substitution of Eq. (21) into (17) yields... 

The phenomenology of failure of amorphous elastomers (crosslinked amorphous polymers at T>Tg) differs from the scheme shown in Figure 11.9. It will be discussed later. 

Fig. 7.14. Crosslinked amorphous polymer, (a) Different states as a function of T. (b) Variation of modulus with T for two different molecular weights Mi < M2 between crosslink points...

Fig. 1 Four types of SMPs (dual-shape effect) depicted as a function of their dynamic thermomechanical behavior. Plotted is the tensile storage modulus vs temperature as measured using a smtdl oscillatory deformation at 1 Hz for (a) Cat. A-I, chemically crosslinked amorphous polymer network (7, = Tg) (b) Cat. A-II, chemically crosslinked semicrystalline polymer networks (Ttrans = 7m) (c) Cat. B-I, physically crosslinked thermoplastic with r,ra,K = 7g and (d) Cat. B-II, physically crosslinked thermoplastic (Tlrans = Tm). Taken from ref [5], Copyright 2007. Reproduced by permission of the Roytd Society of Chemistry, http //dx.doi.org/10.1039/b615954k...

Investigation of Solid-State Transitions in Linear and Crosslinked Amorphous Polymers... 

Monnerie, L., Lauprgtre, F.O. and Halary, J.L. (2005) Investigation of solid-state transitions in linear and crosslinked amorphous polymers. Adv. Polym. Sci., 187, 35-213 (2011) Polymer Materials Macroscopic Properties and Molecular Interpretations, John Wiley Sons, Hoboken, New Jersey. 

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