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Photoactivated ring opening polymeri...

Wu, Xiaosong.

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Photoactivated ring opening polymerization of (di)silacyclobutanes by platinum(II) beta-diketonates.

Record Type:	Language materials, printed : Monograph/item
Title/Author:	Photoactivated ring opening polymerization of (di)silacyclobutanes by platinum(II) beta-diketonates./
Author:	Wu, Xiaosong.
Description:	117 p.
Notes:	Adviser: Douglas C. Neckers.
Contained By:	Dissertation Abstracts International61-11B.
Subject:	Chemistry, Polymer. -
Online resource:	http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=9995058
ISBN:	9780493034010

Photoactivated ring opening polymerization of (di)silacyclobutanes by platinum(II) beta-diketonates.
Wu, Xiaosong.

Photoactivated ring opening polymerization of (di)silacyclobutanes by platinum(II) beta-diketonates. - 117 p.

Adviser: Douglas C. Neckers.

Thesis (Ph.D.)--Bowling Green State University, 2000.

Photoactivated telomerization of TMDSCB with hydrosilanes was discovered. Also, this reaction is found to compete effectively with the hydrosilylation reaction, revealing a versatile catalytic ability of the photogenerated platinum species.

ISBN: 9780493034010Subjects--Topical Terms:

1018428
Chemistry, Polymer.

Photoactivated ring opening polymerization of (di)silacyclobutanes by platinum(II) beta-diketonates.
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035 $a (UMI)AAI9995058
035 $a AAI9995058
040 $a UMI $c UMI
100 1 $a Wu, Xiaosong. $3 1029218
245 1 0 $a Photoactivated ring opening polymerization of (di)silacyclobutanes by platinum(II) beta-diketonates.
300 $a 117 p.
500 $a Adviser: Douglas C. Neckers.
500 $a Source: Dissertation Abstracts International, Volume: 61-11, Section: B, page: 5900.
502 $a Thesis (Ph.D.)--Bowling Green State University, 2000.
520 $a Photoactivated telomerization of TMDSCB with hydrosilanes was discovered. Also, this reaction is found to compete effectively with the hydrosilylation reaction, revealing a versatile catalytic ability of the photogenerated platinum species.
520 $a It has been discovered that photoactivated ring opening polymerization of 1.1,3,3-tetramethyl-1,3-disilacyclobutane takes place in the presence of Pt(acac)2. Excellent conversion (>90%) and high molecular weight (ca. 105) polymers are obtained in the absence of O2. Inhibition experiments reveal the coexistence of both homogeneous and heterogeneous catalytic species, with the former being more active than the latter. Pt colloid is proven to be the heterogeneous catalyst by a TEM study. Near UV irradiation of the platinum complex is thought to cleave the Pt-O bond and produce a coordinatively unsaturated species, which interacts with the Si-C bond of the four membered ring to give rise to the polymerization.
520 $a Efficient ring opening polymerization of TMDSCB takes place upon visible light irradiation (405 nm) in the presence of Pt(tfac)2 , Pt(btfac)2 and Pt(bac)2. Pt(hfac)2 is least active although it has the largest quantum yield of disappearance. Enhancement of catalytic activity is observed when O2 is excluded.
520 $a A poly(methacrylate) with a tethered silacyclobutane moiety was synthesized and it serves as a negative-tone photoresist. The functioning of chemical amplification was demonstrated by the dramatic postbaking effect. Therefore, this newly discovered photochemical process has potential application in photolithography process.
590 $a School code: 0018.
650 4 $a Chemistry, Polymer. $3 1018428
650 4 $a Chemistry, Radiation. $3 1017804
690 $a 0495
690 $a 0754
710 2 0 $a Bowling Green State University. $3 676285
773 0 $t Dissertation Abstracts International $g 61-11B.
790 $a 0018
790 1 0 $a Neckers, Douglas C., $e advisor
791 $a Ph.D.
792 $a 2000
856 4 0 $u http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=9995058