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Role of moisture in photo-ageing-macromolecular architecture evolution of acrylic-urethane network

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Title: Role of moisture in photo-ageing-macromolecular architecture evolution of acrylic-urethane network
Authors: Ishida, Takato Browse this author
Kitagaki, Ryoma Browse this author →KAKEN DB
Hagihara, Hideaki Browse this author
Elakneswaran, Yogarajah Browse this author
Keywords: Photodegradation
Crosslinked urethane
Issue Date: Apr-2021
Publisher: Elsevier
Journal Title: Polymer Testing
Volume: 96
Start Page: 107123
Publisher DOI: 10.1016/j.polymertesting.2021.107123
Abstract: In this work, the role of moisture in photo-ageing was discussed for the case of an acrylic-urethane network. Ageing behaviours were characterised by Fourier transform infra-red spectroscopy, positron annihilation lifetime spectroscopy, sol-gel analysis, and differential scanning calorimetry. Two common features between dry and wet photo-ageing, namely, decrease in the mean free volume and increase in the glass transition temperature were observed as photo-oxidation progressed. The characteristics of the final internal structure of the wet photo-aged sample differed from those of the dry photo-aged sample. Although the dry photo-aged samples suggested network densification due to extensive crosslinking formation, wet photo-ageing led to an inhomogeneous structure wherein the average molar mass between crosslinks (at a scale of several nanometres) increased and some domains crosslinked at the sub-nanoscale. Considering the physical (plasticisation) and chemical (hydrolysis) effects induced by water, a possible mechanism for the evolution of the macromolecular architecture was proposed for photo-ageing in dry and wet environments.
Type: article
Appears in Collections:工学院・工学研究院 (Graduate School of Engineering / Faculty of Engineering) > 雑誌発表論文等 (Peer-reviewed Journal Articles, etc)

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