Combinatorial and High-Throughput Screening of the Effect of Siloxane Composition on the Surface Properties of Crosslinked Siloxane-Polyurethane Coatings
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- 作者：Abdullah Ekin ; Dean C. Webster
- 刊名：Journal of Combinatorial Chemistry
- 出版年：2007
- 出版时间：January 2007
- 年：2007
- 卷：9
- 期：1
- 页码：178 - 188
- 全文大小：430K
- 年卷期：v.9,no.1(January 2007)
- ISSN：1520-4774
文摘
Libraries of siloxane-polyurethane coatings were designed, formulated, and screened using high-throughputexperimentation. Four independent variables that were analyzed were the molecular weight of poly(dimethylsiloxane) (PDMS), presence or absence of poly(
chars/epsilon.gif" BORDER=0 >-caprolactone) (PCL) blocks attached to the PDMSbackbone, the length of the PCL blocks, and the siloxane polymer level in the coating formulations. Inaddition to the siloxane libraries (3-aminopropyl-terminated PDMS and poly(chars/epsilon.gif" BORDER=0 >-caprolactone)-poly(dimethylsiloxane)-poly(chars/epsilon.gif" BORDER=0 >-caprolactone) (PCL-PDMS-PCL) triblock copolymers), the coating formulationincluded a trifunctional isocyanate crosslinker, trifunctional poly(chars/epsilon.gif" BORDER=0 >-caprolactone) polyol, 2,4-pentanedione(pot-life extender), dibutyltin diacetate (catalyst), and a blend of solvents. The resulting coatings were analyzedfor their surface energy and pseudobarnacle adhesion both before and after aging the coatings for 30 daysin water. The water and methylene iodide contact angle averages increase with increasing molecular weightof PDMS. Coatings prepared from PCL-PDMS-PCL triblock copolymers have lower surface energiesthan coatings prepared from 3-aminopropyl-terminated PDMS; however, lower pseudobarnacle adhesionresults were obtained for the coatings prepared from 3-aminopropyl-terminated PDMS than coatings preparedfrom PCL-PDMS-PCL triblock copolymers. The siloxane polymer level in the coating formulations doesnot have a significant effect on the surface energy of the coatings, but it resulted in higher pseudobarnacleadhesion.
chars/epsilon.gif" BORDER=0 >-caprolactone) (PCL) blocks attached to the PDMSbackbone, the length of the PCL blocks, and the siloxane polymer level in the coating formulations. Inaddition to the siloxane libraries (3-aminopropyl-terminated PDMS and poly(chars/epsilon.gif" BORDER=0 >-caprolactone)-poly(dimethylsiloxane)-poly(chars/epsilon.gif" BORDER=0 >-caprolactone) (PCL-PDMS-PCL) triblock copolymers), the coating formulationincluded a trifunctional isocyanate crosslinker, trifunctional poly(chars/epsilon.gif" BORDER=0 >-caprolactone) polyol, 2,4-pentanedione(pot-life extender), dibutyltin diacetate (catalyst), and a blend of solvents. The resulting coatings were analyzedfor their surface energy and pseudobarnacle adhesion both before and after aging the coatings for 30 daysin water. The water and methylene iodide contact angle averages increase with increasing molecular weightof PDMS. Coatings prepared from PCL-PDMS-PCL triblock copolymers have lower surface energiesthan coatings prepared from 3-aminopropyl-terminated PDMS; however, lower pseudobarnacle adhesionresults were obtained for the coatings prepared from 3-aminopropyl-terminated PDMS than coatings preparedfrom PCL-PDMS-PCL triblock copolymers. The siloxane polymer level in the coating formulations doesnot have a significant effect on the surface energy of the coatings, but it resulted in higher pseudobarnacleadhesion.