Effect of spatial constraints on phase separation during polymerization in sequential semi-interpenetrating polymer networks

Babkina, N. V.; Lipatov, Yu.S.; Alekseeva, T. T.; Sorochinskaya, L. A.; Datsyuk, Yu. I.

doi:10.1134/s0965545x08070109

Cited by 12 publications

(8 citation statements)

References 11 publications

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“…Recently, a model incorporating the role of damage accumulation to the mechanical polybutylmethacrylate and polyurethane, along with data for the corresponding neat components. 18 The behavior is consistent with a homogeneous phase morphology.…”

Section: A Interpenetrating Polymer Networksupporting

confidence: 65%

“…15,16 The glass transition temperature, T g , of an IPN is intermediate to those of the pure components, as shown in Figure 2 for an IPN 17 and Figure 3 for a semi-IPN. 18 The phase morphologies are not homogeneous, but the domains are small, so that properties such as the segmental dynamics tend to be averages. Because T g is size dependent for domain sizes on the order or smaller than the cooperativity length scale, changes in the glass transition temperatures of the components do not necessarily indicate mixing on the segmental level.…”

Section: A Interpenetrating Polymer Networkmentioning

confidence: 99%

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Unconventional Rubber Networks: Circumventing the Compromise Between Stiffness and Strength

Roland

2013

Rubber Chemistry and Technology

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The failure properties of rubbery networks exhibit a maximum as a function of cross-link density or modulus. To avoid excess creep, elastomers are usually formulated such that their state of cure falls past this maximum, which means there is an inevitable compromise between modulus and failure properties (stiffness and strength). This review describes various approaches to circumventing the problem by the use of unconventional network structures. The obtainable improvements in mechanical properties can be substantial (e.g

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Section: A Interpenetrating Polymer Networksupporting

confidence: 65%

Section: A Interpenetrating Polymer Networkmentioning

confidence: 99%

Unconventional Rubber Networks: Circumventing the Compromise Between Stiffness and Strength

Roland

2013

Rubber Chemistry and Technology

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“…"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]. Even though the constituents are incompatible, small phase domains are obtained, homogenizing the properties.…”

Section: Interpenetrating Polymer Network An Interpenetrating Polymmentioning

confidence: 99%

“…Loss tangent for linear polybutylmethacrylate, polyurethane network, and their semi-IPN. Data from ref [97]…”

mentioning

confidence: 99%

Viscoelastic Behavior of Rubbery Materials

Roland¹

2011

145

124

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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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“…Babkina et al [22] suggested that the sequential reaction of the IPN systems form considerable amounts of topological engagements between the two polymer chains, facilitating the compatibility of the components. In addition, the continuity of the PU phase plays a significant role in the development of the PMMA phase of the IPN as well as the resulting phase separation.…”

Section: Resultsmentioning

confidence: 99%

Synthesis and characterization of high performance, transparent interpenetrating polymer networks with polyurethane and poly(methyl methacrylate)

Bird

Clary

Jajam

et al. 2012

Polymer Engineering & Sci

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Transparent, interpenetrating polymer network (IPN) materials were synthesized using polyurethane (PU) and poly(methyl methacrylate) (PMMA). PMMA contributed to the transparency and rigidity necessary for use in impact-resistant applications, whereas PU contributed to toughness. Several factors affecting the physical properties, such as the ratio of PU to PMMA, curing profile, inclusion of different isocyanates for the PU phase, and use of an inhibitor in the PMMA phase, were investigated. Full-IPNs were synthesized so that the two polymer networks would remain entangled with one another, and domain sizes of each system were reduced, mitigating phase separation. Both simultaneous IPNs, polymerization of monomers occurring at the same time, and sequential IPNs, polymerization of monomers occurring at different temperatures, were synthesized for studying the reaction kinetics and final morphologies. The phase morphology and the final thermal and mechanical properties of the IPNs prepared were evaluated. Findings suggest that samples containing $80 wt% PMMA, 1,6-diisocyanatohexane 99þ% (DCH), and an inhibitor with the MMA monomer created favorable results in the thermo-mechanical and optical properties. POLYM. ENG. SCI., 53:716-723, 2013. ª 717 FIG. 3. DMA results showing change in E 0 for IPNs with various amounts of PMMA to PU content with DCH. FIG. 4. DMA results showing change in tan d for IPNs with various amounts of PMMA to PU content with DCH.

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Effect of spatial constraints on phase separation during polymerization in sequential semi-interpenetrating polymer networks

Cited by 12 publications

References 11 publications

Unconventional Rubber Networks: Circumventing the Compromise Between Stiffness and Strength

Unconventional Rubber Networks: Circumventing the Compromise Between Stiffness and Strength

Viscoelastic Behavior of Rubbery Materials

Synthesis and characterization of high performance, transparent interpenetrating polymer networks with polyurethane and poly(methyl methacrylate)

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