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Volume 3, Issue 2 (Suppl)
Trends in Green chem
ISSN: 2471-9889
Environmental & Green Chemistry 2017
July 24-26, 2017
Page 49
5
th
International Conference on
6
th
International Conference on
July 24-26, 2017 Rome, Italy
Environmental Chemistry and Engineering
Green Chemistry and Technology
&
Photo-detachable adhesives composed of photo-depolymerizable poly(olefin sulfone)s
Takeo Sasaki
Tokyo University of Science, Japan
A
novel photo detachable adhesive was prepared using a photo-depolymerizable cross-linked poly(olefin sulfone). Poly(olefin
sulfone)s containing photobase generators (PBG) are known to exhibit photoinduced depolymerization. A poly (olefin sulfone)
is a 1:1 alternating copolymer of an olefin monomer and sulfur dioxide and the protons on the carbons adjacent to the sulfonyl groups
in these polymers are readily abstracted by bases. This abstraction results in a depolymerization chain reaction, and so poly(olefin
sulfone)s incorporating a photobase-generating chromophore will undergo a photoinduced unzipping reaction. In this reaction, the
primary chain of the poly(olefin sulfone) is depolymerized to regenerate the original olefin monomer together with sulfur dioxide.
In the present study, a poly(olefin sulfone) composed of a volatile olefin monomer and a second olefin monomer possessing a cross
linkable moiety was synthesized. If a mixture of this poly(olefin sulfone) and a crosslinking reagent is sandwiched between glass plates
and cured, the plates will be glued together. Subsequently, irradiating the glued plates with UV light in conjunction with heating will
separate the plates. In the present study, a poly(olefin sulfone) incorporating carboxylic acid moieties was synthesized and mixed
with a polycarbodiimide crosslinker and a photobase generator. The mixture worked as a thermosetting adhesive and exhibited high
adhesive strength on quartz plates, comparable to the bond strengths obtained with commercially-available epoxy adhesives. When
the bonded quartz plates were exposed to UV light and subsequently heated to 100°C, the poly(olefin sulfone) depolymerized and
the plates could be detached.
Figure 1:
Photoinduced depolymerization of poly(olefin sulfone)s containing photobase generators and a sequence showing a
photodetachable thermosetting adhesive.
Biography
Takeo Sasaki is a Professor at the Department of Chemistry, Tokyo University of Science since 2000. He received his Doctorate from the Tokyo Institute of
Technology in 1994. He conducts research on Photorefractive Liquid Crystals and Photopolymers. He received the SPSJ Wiley Award (2004) from the Society of
Polymer Science, Japan and Senior Membership of SPIE (2016). He is currently a Director of the Japan Liquid Crystal Society and also the Director of the Research
Committee on Organic Materials for Information Technology of the Japan Society for Promotion of Science (JSPS).
sasaki@rs.kagu.tus.ac.jpTakeo Sasaki, Trends in Green chem, 3:2
DOI: 10.21767/2471-9889-C1-002