Photodimerization of coumarin functionalized poly(alkyl acrylate) and poly(alkyl methacrylate) random copolymers: Influence of copolymer composition on photocrosslinking

被引：19

作者：

Huyck, Rebecca H. ^{[1
]}

Trenor, Scott R. ^{[2
]}

Love, Brian J. ^{[3
]}

Long, Timothy E. ^{[1
]}

机构：

[1] Virginia Tech, Dept Chem, Blacksburg, VA 24061 USA

[2] Westhollow Technol Ctr, Houston, TX USA

[3] Virginia Tech, Dept Mat Sci & Engn, Blacksburg, VA USA

来源：

JOURNAL OF MACROMOLECULAR SCIENCE PART A-PURE AND APPLIED CHEMISTRY | 2008年 / 45卷 / 01期

基金：

美国国家科学基金会;

关键词：

photocrosslink; coumarin; UV-Vis spectroscopy; glass transition; reciprocity;

D O I：

10.1080/10601320701681839

中图分类号：

O63 [高分子化学（高聚物）];

学科分类号：

070305 ; 080501 ; 081704 ;

摘要：

Coumarin-containing poly(alkyl (meth)acrylates) were prepared via 70-80% esterification of hydroxy-containing acrylic copolymers, then solution cast into thin films and photocrosslinked via the dimerization of coumarin derivatives with UVA light. The coumarin-modified polymers crosslinked upon exposure and exhibited gel fractions between 74 and 99%. Coumarin dimerization efficiency increased with higher polymer mobility at the irradiation temperature. The effects of light intensity and irradiation time in photo-dimerized systems followed the Bunsen-Roscoe reciprocity law indicating that coumarin photodimerization depended only on dose. Thus, low intensities are overcome with longer times. This is an important advantage over photoinitiated free radical crosslinking which depends on irradiation intensity to the 1/2 power.

引用

页码：9 / 15

页数：7

共 30 条

[1] APPLICATION OF A CHEMICAL GROUP CONTRIBUTION TECHNIQUE FOR CALCULATING SOLUBILITY PARAMETERS OF POLYMERS [J].

AHMAD, H ;

YASEEN, M .

POLYMER ENGINEERING AND SCIENCE, 1979, 19 (12) :858-863

[2] Photoinduced changes of surface order in coumarin side-chain polymer films used for liquid crystal photoalignment [J].

Bergmann, G ;

Jackson, PO ;

Hogg, JHC ;

Stirner, T ;

O'Neill, M ;

Duffy, WL ;

Kelly, SM ;

Clark, GF .

APPLIED PHYSICS LETTERS, 2005, 87 (06)

[3]

BUNSEN RW, 1859, ANN PHYS, V108, P234

[4] Copolymers derived from 7-acryloyloxy-4-methylcoumarin and acrylates .2. Reversible photocrosslinking and photocleavage [J].

Chen, Y ;

Geh, JL .

POLYMER, 1996, 37 (20) :4481-4486

[5]

Chen Y, 1997, J APPL POLYM SCI, V64, P1759, DOI 10.1002/(SICI)1097-4628(19970531)64:9<1759::AID-APP12>3.3.CO

[6]

2-C

[7]

Chen Y, 1997, J APPL POLYM SCI, V64, P1749, DOI 10.1002/(SICI)1097-4628(19970531)64:9<1749::AID-APP11>3.0.CO

[8]

2-T

[9]

Chen Y, 1997, J POLYM SCI POL CHEM, V35, P2999

[10] A NOVEL NONIONIC HYDROGEL FROM 2-METHYL-2-OXAZOLINE .4. REVERSIBLE GELATION OF POLYOXAZOLINE BY MEANS OF DIELS-ALDER REACTION [J].

CHUJO, Y ;

SADA, K ;

SAEGUSA, T .

MACROMOLECULES, 1990, 23 (10) :2636-2641

← 1 2 3 →