Semi-Interpenetrating Polymer Networks Prepared by in situ Photo-Crosslinking of Miscible Polymer Blends

Tamai, Toshikazu; Imagawa, A.; Tran-Cong, Qui

doi:10.1021/ma00103a036

Cited by 39 publications

(32 citation statements)

References 3 publications

(4 reference statements)

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“…Radiation crosslinking provides another source of heterogeneity that can be introduced readily in phase separating films. Measurements of irradiated photoreactive blends of PVME and PS with a crosslinkable side group styrene-chloromethyl styrene random copolymer (PSCMS) show the formation of striking ring composition patterns [46,47] and we reproduce one of these pat-terns in Fig. 11 (compare with Fig.…”

Section: Comparison With Experimental Resultsmentioning

confidence: 77%

Filler-induced composition waves in phase-separating polymer blends

1999

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The influence of immobile filler particles (spheres, fibers, platelets) on polymer-blend phase separation is investigated computationally using a generalization of the Cahn-Hilliard-Cook (CHC) model. Simulation shows that the selective affinity of one of the polymers for the filler surface leads to the development of concentration waves about the filler particles at an early stage of phase separation in near critical composition blends. These "target" patterns are overtaken in late-stage phase separation by a growing "background" spinodal pattern characteristic of blends without filler particles. The linearized CHC model is used to estimate the number of composition oscillations emanating from isolated filler particles. In far-off-critical composition blends, an "encapsulation layer" grows at the surface of the filler rather than a target pattern. The results of these simulations compare favorably with experiments on filled phase-separating ultrathin blend films in which the filler particles are immobilized on a solid substrate.

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Section: Comparison With Experimental Resultsmentioning

confidence: 77%

Filler-induced composition waves in phase-separating polymer blends

1999

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“…Phase separation is more extensive for sequential IPNs, but cocontinuity can still be achieved. "Semi-IPN" is used in reference to an IPN in which one component remains uncrosslinked [94,95]. The T g of an IPN is expected to be intermediate to the neat component T g 's, as shown in Figure 14 for an IPN [96] and Figure 15 for a semi-IPN [97].…”

Section: Interpenetrating Polymer Network An Interpenetrating Polymmentioning

confidence: 99%

Viscoelastic Behavior of Rubbery Materials

Roland¹

2011

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Contents* Early molecular theories of rubber hyperelasticity were called kinetic theories, in correspondence to the behavior of ideal gases (the molecules of which have neither size nor mutual interactions). The elastic forces of an ideal rubber are caused by thermal motion of the network chains attempting to restore the higher entropy, isotropic state; thus, analogous to ideal gases, ideal rubber elasticity is a statistical effect. In real materials there is also an energy contribution (negative or positive) due to the difference in energy between trans and gauche conformations of the repeat units.of alternative networks -interpenetrating, double, bimodal, heterogeneous, and deswollenare discussed at the conclusion of the chapter.

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“…For higher weight proportions, phase separation generally occurs according to a spinodal decomposition mechanism and materials showing a co-continuous phase morphology are obtained. Phase separation can be observed by SALS [24,26] or SAXS [27,28] in real time during elaboration of the (semi-)IPN.…”

Section: Synthetic Pathwaysmentioning

confidence: 99%