Affiliation:
1. Institute for Chemical Technology and Polymer Chemistry (ITCP) Karlsruhe Institute of Technology Engesserstraße 18 76128 Karlsruhe Germany
2. Research Fellow of Japan Society for the Promotion of Science Tokyo 102‐0083 Japan
3. Soft Matter Synthesis Laboratory Institute for Biological Interfaces III Hermann‐von‐Helmholtz‐Platz 1, Eggenstein‐Leopoldshafen 76344 Karlsruhe Germany
Abstract
AbstractHerein, novel photoresponsive spiropyran (SP)‐based P(DEGMA‐co‐SpMA) copolymers with variable percentages of SP fractions are synthesized. The SP group present in these polymers exhibited the abilities of reversible photoisomerism. Their photoresponsive, structural, and thermal properties have been investigated and compared using various characterization techniques. These light‐responsive copolymers are found to exhibit photoswitchable glass transition temperature (Tg), high thermal stability (Td > 250°C), instant photochromism as well as fluorescence upon exposure to UV light. It is demonstrated that the Tg of these synthesized polymers increased when irradiated with UV light (λ = 365 nm), as a consequence of the photoisomerization of incorporated SP groups into their merocyanine form. This increase in Tg is attributed to an increase in polarity and a decrease in the overall entropy of the polymeric system when it switches from the ring‐closed SP form (less‐ordered state) to the ring‐opened merocyanine form (more‐ordered state). Therefore, such polymers with a unique feature of phototunable glass transition temperatures provide the possibility to be integrated into functional materials for various photoresponsive applications.
Subject
Materials Chemistry,Polymers and Plastics,Organic Chemistry
Cited by
2 articles.
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