The synthesis and morphology of grafted semiinterpenetrating polymer networks on the basis of functional prepolymers

Anžlovar, Alojz; Anžur, I.; Malavašič, T.

doi:10.1002/(sici)1099-0518(19960915)34:12<2349::aid-pola9>3.0.co;2-r

Cited by 7 publications

(14 citation statements)

References 15 publications

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“…It is known from the literature that in segmented polyether polyurethanes a microphase separation occurs as a result of the thermodynamic incompatibility between relatively non-polar soft segments and polar hard segments. Phase separation is especially strong in segmented polyether polyurethanes with functional carboxylic groups incorporated in hard segments, since these groups promote intermolecular hydrogen bonding among the hard segments [35]. Both low-and high-temperature T g processes are clearly seen in DSC and DMA.…”

Section: Discussionmentioning

confidence: 99%

Molecular dynamics of linear and hyperbranched polyurethanes and their blends

Okrasa

Žigon

Žagar

et al. 2005

Journal of Non-Crystalline Solids

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Section: Discussionmentioning

confidence: 99%

Molecular dynamics of linear and hyperbranched polyurethanes and their blends

Okrasa

Žigon

Žagar

et al. 2005

Journal of Non-Crystalline Solids

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“… b T gc = calculated glass‐transition temperature using eq 1, where T g and Δ c p of polyester soft segments were −58 °C and 0.250 J/g °C, whereas those of PU hard segments were 40 °C and 0.41 J/g °C 13…”

Section: Resultsmentioning

confidence: 99%

“…IPNs were prepared by the procedure described in the literature10, 13, 15 and are outlined in Figure 1. Prepolymers in solution were mixed in a glass vessel under a constant flow of dry nitrogen in an equimolar ratio of functional groups in PU and PM prepolymer.…”

Section: Methodsmentioning

confidence: 99%

“…In our previous publication,13 we reported on the morphology and mechanical properties of IPNs on the basis of polyether polyurethane (PU) prepolymers. The miscibility of PU and methacrylate prepolymers was enhanced by introducing carboxylic groups into the PU prepolymers and tertiary amine functional groups into the polymethacrylate (PM) prepolymers.…”

Section: Introductionmentioning

confidence: 99%

“…Semi‐IPNs based on PU prepolymers with more polar polyester soft segments as well as PM prepolymer were therefore prepared. We used the same system of complementary functional groups to enhance miscibility as those previously cited13 (carboxylic functional groups in the PU prepolymer and tertiary amine functional groups in the PM prepolymer). In this work, we report on the morphological and mechanical properties of novel IPNs and compare the results with those of IPNs on the basis of PU prepolymers with polyether soft segments.…”

Section: Introductionmentioning

confidence: 99%

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Semi‐interpenetrating polymer networks based on polyurethane and polymethacrylate functional prepolymers: Morphology and mechanical properties in dependence of the concentration of functional groups

Anžlovar

Žigon

2001

J Polym Sci B Polym Phys

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Grafted semi‐interpenetrating polymer networks (IPNs) were prepared from polyurethane (PU) prepolymers with polyester soft segments and hard segments containing carboxylic functional groups as well as polymethacrylate (PM) prepolymers with tertiary amine functional groups. The dependence of morphological and mechanical properties on the concentration of functional groups was studied. The enhanced miscibility of PU and PM prepolymers was observed at concentrations of functional groups of 0.25 mmol/g of polymer and above. Despite the improved miscibility, the PM prepolymers showed a tendency toward phase separation. Because the observed glass‐transition temperature shifts of PU prepolymers indicated substantial miscibility, we ascribed this phenomenon to the presence of methyl methacrylate rich sequences in the PM prepolymer. The observed changes in mechanical properties by increasing the content of functional groups were typical for ionomers. Young's modulus increased as a result of physical interactions between functional groups. A significant drop in tensile strength was observed in IPN samples with phase‐separated PU and PM prepolymers. © 2001 John Wiley & Sons, Inc. J Polym Sci Part B: Polym Phys 40: 115–123, 2002

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Spin probe study of semi‐interpenetrating polymer networks based on polyurethane and polymethacrylate functional prepolymers

Čulin

Veksli

Anžlovar

et al. 2003

Polymer International

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The motional transition and heterogeneity of semi-interpenetrating networks (SIPNs) based on polyurethane (PU) with carboxylic groups and methacrylic copolymer (PM) with tertiary amine groups were studied by the electron spin resonance (ESR) spin probe method. The concentration of functional groups in both prepolymers varied from 0 to 0.45 mmol g −1 . Spin-probed SIPNs show that the temperaturedependent spectra are sensitive to polymer interactions imposed by functional groups. These interactions determine the free volume distribution in the matrix and temperature at which motional transition takes place. The fraction of free volume increases with functional group concentration and reaches its maximum at 0.25 mmol g −1 . Further increases in the functional group concentration reduce the free volume. The results of the networks with strong interactions are discussed in terms of the interference of the plasticizing effect of the PU component and the formation of possible cluster cross-links, which restricts segmental motions.

show abstract

The synthesis and morphology of grafted semiinterpenetrating polymer networks on the basis of functional prepolymers

Cited by 7 publications

References 15 publications

Molecular dynamics of linear and hyperbranched polyurethanes and their blends

Molecular dynamics of linear and hyperbranched polyurethanes and their blends

Semi‐interpenetrating polymer networks based on polyurethane and polymethacrylate functional prepolymers: Morphology and mechanical properties in dependence of the concentration of functional groups

Spin probe study of semi‐interpenetrating polymer networks based on polyurethane and polymethacrylate functional prepolymers

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