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Aspects of polymer surface science: ...

Uilk, Janelle M.

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Aspects of polymer surface science: Part A. Hydrosilation-cured polydimethylsiloxane networks. Part B. Synthesis and characterization of dual-function oxetane macromonomers.

紀錄類型:	書目-電子資源 : Monograph/item
正題名/作者:	Aspects of polymer surface science: Part A. Hydrosilation-cured polydimethylsiloxane networks. Part B. Synthesis and characterization of dual-function oxetane macromonomers./
作者:	Uilk, Janelle M.
面頁冊數:	110 p.
附註:	Source: Dissertation Abstracts International, Volume: 64-02, Section: B, page: 0742.
Contained By:	Dissertation Abstracts International64-02B.
標題:	Chemistry, Polymer. -
電子資源:	http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=3080576
ISBN:	0496284514

Aspects of polymer surface science: Part A. Hydrosilation-cured polydimethylsiloxane networks. Part B. Synthesis and characterization of dual-function oxetane macromonomers.
Uilk, Janelle M.

Aspects of polymer surface science: Part A. Hydrosilation-cured polydimethylsiloxane networks. Part B. Synthesis and characterization of dual-function oxetane macromonomers. - 110 p.

Source: Dissertation Abstracts International, Volume: 64-02, Section: B, page: 0742.

Thesis (Ph.D.)--Virginia Commonwealth University, 2003.

A method for measuring the intrinsic advancing (thetaadv) and receding (thetarec) water contact angles was developed for hydrosilation-cured polydimethylsiloxane (PDMS) network coatings. Static and dynamic contact angle (DCA) measurements were used to evaluate coatings prepared from commercially available divinyl-terminated polydimethylsiloxane (C-PDMS) and from synthesized narrow polydispersity divinyl-terminated polydimethylsiloxane (N-PDMS). According to DCA measurements, all PDMS network coatings rapidly contaminated the water surface during analysis. Intrinsic contact angles on the PDMS coatings were measured using either a large surface area reservoir or by repeatedly changing the water reservoir between DCA cycles when measured in small surface area reservoirs. The intrinsic advancing contact angle (theta adv), for hydrosilane network coatings was determined to be 118° +/- 2°. Values for the receding contact angles (thetarec ) were from 81--97° with the most commonly observed values in the 83--86° range. For a given set of samples, both theta adv and thetarec measurements typically had standard deviations of <2°. The factors contributing to the wide range of theta rec values are not well understood, but appear to stem from differences in composition. After water surface contamination, thetaadv decreased to 110° +/- 2° while thetarec increased by 7° irrespective of the initial "uncontaminated" theta rec value.

ISBN: 0496284514Subjects--Topical Terms:

1018428
Chemistry, Polymer.

Aspects of polymer surface science: Part A. Hydrosilation-cured polydimethylsiloxane networks. Part B. Synthesis and characterization of dual-function oxetane macromonomers.
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245 1 0 $a Aspects of polymer surface science: Part A. Hydrosilation-cured polydimethylsiloxane networks. Part B. Synthesis and characterization of dual-function oxetane macromonomers.
300 $a 110 p.
500 $a Source: Dissertation Abstracts International, Volume: 64-02, Section: B, page: 0742.
500 $a Director: Kenneth J. Wynne.
502 $a Thesis (Ph.D.)--Virginia Commonwealth University, 2003.
520 $a A method for measuring the intrinsic advancing (thetaadv) and receding (thetarec) water contact angles was developed for hydrosilation-cured polydimethylsiloxane (PDMS) network coatings. Static and dynamic contact angle (DCA) measurements were used to evaluate coatings prepared from commercially available divinyl-terminated polydimethylsiloxane (C-PDMS) and from synthesized narrow polydispersity divinyl-terminated polydimethylsiloxane (N-PDMS). According to DCA measurements, all PDMS network coatings rapidly contaminated the water surface during analysis. Intrinsic contact angles on the PDMS coatings were measured using either a large surface area reservoir or by repeatedly changing the water reservoir between DCA cycles when measured in small surface area reservoirs. The intrinsic advancing contact angle (theta adv), for hydrosilane network coatings was determined to be 118° +/- 2°. Values for the receding contact angles (thetarec ) were from 81--97° with the most commonly observed values in the 83--86° range. For a given set of samples, both theta adv and thetarec measurements typically had standard deviations of <2°. The factors contributing to the wide range of theta rec values are not well understood, but appear to stem from differences in composition. After water surface contamination, thetaadv decreased to 110° +/- 2° while thetarec increased by 7° irrespective of the initial "uncontaminated" theta rec value.
520 $a Homo- and co-macromonomers prepared from cationic ring-opening polymerization of 3-trifluoroethoxymethyl-3-methyl oxetane (3-FOx) and 3-bromomethyl-3-methyl oxetane (BrOx) were synthesized and characterized. A procedure reported by Malik1,2 was modified to prepare the BF3-etherate and 1,4-butanediol co-initiator for the macromonomer preparation. Co-initiators prepared using this modified method provided more control over molecular weight than did co-initiators prepared by Malik's procedure.1,2 Additionally, purification procedures have been developed which remove the low molar-mass impurities (that are reactive with isocyanates) otherwise present in these macromonomers.
520 $a Proton nuclear magnetic resonance (1H NMR) spectroscopy and elemental analysis provided information on co-macromonomer stoichiometry. Samples were prepared in 3:1, 1:1, and 1:3 ratios of 3-FOX to BrOx. Integration of 1H NMR provided evidence of final macromonomers prepared having 3-FOx to BrOx ratios close to those predicted by monomer stoichiometry. 1H NMR data also provided proof that the co-macromonomers were not mixtures of homo-macromonomers. Glass transition temperatures (Tg) in the range of -28 to -47°C were measured using differential scanning calorimetry (DSC). (Abstract shortened by UMI.)
590 $a School code: 2383.
650 4 $a Chemistry, Polymer. $3 1018428
650 4 $a Engineering, Chemical. $3 1018531
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710 2 0 $a Virginia Commonwealth University. $3 1018010
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