Influence of Alkyl Chain Length in Methacrylate Monomers on the Phase Separation Induced by Photo-Polymerization

Kawakubo, Rie; Nakanishi, H.; Norisuye, Tomohisa; Tran‐Cong‐Miyata, Qui

doi:10.1295/koron.2015-0031

Cited by 2 publications

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“…Eventually, the whole polymerizing system reaches a stationary state with a bimodal distribution of molecular weight. This process appears as a general behavior of conventional (uncontrolled) free radical polymerization in the bulk state and has been observed in the polymerization of MMA monomer containing ethylene glycol dimethacrylate (EGDMA) as a crosslinker and also in a series of non‐crosslinked polymethacrylates . Furthermore, at the molecular level, the roles of chain diffusion in the termination step were recently discussed .…”

Section: Features Of Polymerization Kinetics In the Bulk Statementioning

confidence: 91%

“…It has been shown that, for a host polymer with T g lower than the experimental temperature ( T exp ), the molecular weight distribution exhibits a single broad gel permeation chromatography peak. However, it becomes bimodal for polymers with T g higher than T exp . Therefore, the bimodal distribution is generated by the inhomogeneity of the termination process upon approaching the glassy state.…”

Section: Features Of Polymerization Kinetics In the Bulk Statementioning

confidence: 98%

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Phase separation of polymer mixtures driven by photochemical reactions: current status and perspectives

Tran‐Cong‐Miyata

Nakanishi

2016

Polymer International

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Phase separation of polymer mixtures induced by photo-crosslinking and photopolymerization is summarized from the viewpoint of competing interactions in polymeric systems. First, the kinetics of photo-crosslinking and photopolymerization are reviewed with particular emphasis on the Trommsdorff − Norrish effect in polymerization, which leads to the formation of a bimodal distribution of molecular weight at long irradiation time. The emergence of a very large molecular weight and the characteristic time for this effect to set in are utilized as a tool to control the temporal development of the resulting morphology. The shrinkage associated with the reaction and particularly its effect on the phase separation and the morphology are discussed together with the influence of the Trommsdorff − Norrish effect. Experiments on polymerization-induced phase separation extended from binary to ternary mixtures are described where the interfacial interactions give rise to a wide variety of morphologies. Taking advantages of light, experiments using spatial and temporal modulation have been performed to control and manipulate the phase separation. These experimental results are summarized and briefly discussed in relation to the elastic deformation induced by polymerization. Finally, an overview of theoretical studies and numerical simulation of reaction-induced phase separation is given with some comments on the complexity of the phenomena.

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Section: Features Of Polymerization Kinetics In the Bulk Statementioning

confidence: 91%

Section: Features Of Polymerization Kinetics In the Bulk Statementioning

confidence: 98%