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Synthesis and Characterization of a ...

Zhao, Yuanyuan.

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Synthesis and Characterization of a Novel Polyacetal & Design and Preparation of Superhydrophobic Photocatalytic Surfaces.

紀錄類型:	書目-電子資源 : Monograph/item
正題名/作者:	Synthesis and Characterization of a Novel Polyacetal & Design and Preparation of Superhydrophobic Photocatalytic Surfaces./
作者:	Zhao, Yuanyuan.
面頁冊數:	193 p.
附註:	Source: Dissertation Abstracts International, Volume: 76-07(E), Section: B.
Contained By:	Dissertation Abstracts International76-07B(E).
標題:	Physical chemistry. -
電子資源:	http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=3683315
ISBN:	9781321574029

Synthesis and Characterization of a Novel Polyacetal & Design and Preparation of Superhydrophobic Photocatalytic Surfaces.
Zhao, Yuanyuan.

Synthesis and Characterization of a Novel Polyacetal & Design and Preparation of Superhydrophobic Photocatalytic Surfaces. - 193 p.

Source: Dissertation Abstracts International, Volume: 76-07(E), Section: B.

Thesis (Ph.D.)--City University of New York, 2015.

Acetal copolymers represent a family of well-established engineering thermoplastics serving a broad range of important industrial applications including replacement for metals. The first part of this thesis describes the first synthesis of an eight-member ring acetal, 6-methyl-1, 3-dioxocane (MDOC), and its cationic copolymerization with trioxane initiated by boron trifluoride dibutyl etherate. The copolymerization process was monitored in situ using proton NMR. Incorporation of MDOC led to the insertion of the "stopper" unit, "--[CH2CH2CH(CH3)CH 2CH2)O]--", thus synthesizing the new acetal copolymer. A superior copolymer thermal stability with a ~ 20oC increase in degradation onset temperature compared with end-capped polyoxmethylene was observed. Both TGA and DSC data indicated the random placement of the "stopper" in the copolymer likely due to efficient transacetalization because of the higher basicity and flexibility of the stopper unit compared with co-units comprising 2 to 4 carbons in length. DSC thermo-grams showed a melting curve of a polymer with melting point lower, as expected, than that of oxymethylene homopolymer. No homopolymer in the copolymer samples was in indicated by TGA. The new acetal copolymer, poly(6-methyl-1,3-dioxocane-co-trioxane), which has a "stopper" co-unit with five carbon atoms along the backbone, contains the longest reported stopper co-unit, potentially leading to improved elongation, and toughness and better compatibility with a range of additives compared to acetal homopolymers..

ISBN: 9781321574029Subjects--Topical Terms:

1981412
Physical chemistry.

Synthesis and Characterization of a Novel Polyacetal & Design and Preparation of Superhydrophobic Photocatalytic Surfaces.
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100 1 $a Zhao, Yuanyuan. $3 3193313
245 1 0 $a Synthesis and Characterization of a Novel Polyacetal & Design and Preparation of Superhydrophobic Photocatalytic Surfaces.
300 $a 193 p.
500 $a Source: Dissertation Abstracts International, Volume: 76-07(E), Section: B.
500 $a Advisers: Nan-loh Yang; Alan M. lyons.
502 $a Thesis (Ph.D.)--City University of New York, 2015.
520 $a Acetal copolymers represent a family of well-established engineering thermoplastics serving a broad range of important industrial applications including replacement for metals. The first part of this thesis describes the first synthesis of an eight-member ring acetal, 6-methyl-1, 3-dioxocane (MDOC), and its cationic copolymerization with trioxane initiated by boron trifluoride dibutyl etherate. The copolymerization process was monitored in situ using proton NMR. Incorporation of MDOC led to the insertion of the "stopper" unit, "--[CH2CH2CH(CH3)CH 2CH2)O]--", thus synthesizing the new acetal copolymer. A superior copolymer thermal stability with a ~ 20oC increase in degradation onset temperature compared with end-capped polyoxmethylene was observed. Both TGA and DSC data indicated the random placement of the "stopper" in the copolymer likely due to efficient transacetalization because of the higher basicity and flexibility of the stopper unit compared with co-units comprising 2 to 4 carbons in length. DSC thermo-grams showed a melting curve of a polymer with melting point lower, as expected, than that of oxymethylene homopolymer. No homopolymer in the copolymer samples was in indicated by TGA. The new acetal copolymer, poly(6-methyl-1,3-dioxocane-co-trioxane), which has a "stopper" co-unit with five carbon atoms along the backbone, contains the longest reported stopper co-unit, potentially leading to improved elongation, and toughness and better compatibility with a range of additives compared to acetal homopolymers..
520 $a Chapter 3 presents a novel lamination fabrication method that enables pre-formed TiO2 nanoparticles to become partially embedded in the surface of a thermoplastic polymer film. In this way, the particles are strongly adhered to the surface while remaining accessible to the aqueous solution. By modifying the fabrication conditions (e.g. temperature, pressure, polymer melt viscosity, etc.), the morphology of the hierarchical TiO2-polymer surface can be controlled and thus the rate of photocatalytic reactions can be increased. In addition, the fraction of TiO2 particles that become fully embedded in the polymer surface, and so inaccessible to photocatalysis reactions, can be reduced through lamination process control, thereby reducing costs.
520 $a In Chapter 4 and Chapter 5, a general approach is presented to incorporating particles into a superhydrophobic surface that catalyze the formation of reactive oxygen species. Superhydrophobic photocatalytic surfaces are prepared using hydrophilic TiO2 nanoparticles and hydrophobic Silicon-Phthalocyanine photosensitizer particles. A stable Cassie state was maintained, even on surfaces fabricated with hydrophilic TiO2 particles, due to significant hierarchical roughness. A triple phase photogenerator is designed and fabricated. By printing the surface on a porous support, oxygen could be flowed through the plastron resulting in significantly higher photooxidation rates relative to a static ambient. Photooxidation of Rhodamine B and BSA were studied on TiO2-containing surfaces and singlet oxygen was trapped on surfaces incorporating Silicon-Phthalocyanine photosensitizer particles. Catalyst particles could be isolated in the plastron to avoid contamination by the solution. This approach may prove useful for water purification and medical devices where isolation of the catalyst particle from the solution is necessary and so Cassie stability is required. (Abstract shortened by UMI.).
590 $a School code: 0046.
650 4 $a Physical chemistry. $3 1981412
650 4 $a Polymer chemistry. $3 3173488
650 4 $a Materials science. $3 543314
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710 2 $a City University of New York. $b Chemistry. $3 1058373
773 0 $t Dissertation Abstracts International $g 76-07B(E).
790 $a 0046
791 $a Ph.D.
792 $a 2015
793 $a English
856 4 0 $u http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=3683315