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Synthesis of hyperbranched side-chai...

Singh, Anirudha.

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Synthesis of hyperbranched side-chain liquid crystalline polyacrylates: Effect of the architecture on the rheological properties.

紀錄類型:	書目-語言資料,印刷品 : Monograph/item
正題名/作者:	Synthesis of hyperbranched side-chain liquid crystalline polyacrylates: Effect of the architecture on the rheological properties./
作者:	Singh, Anirudha.
面頁冊數:	187 p.
附註:	Adviser: Coleen Pugh.
Contained By:	Dissertation Abstracts International69-03B.
標題:	Chemistry, Polymer. -
電子資源:	http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=3308505
ISBN:	9780549554417

Synthesis of hyperbranched side-chain liquid crystalline polyacrylates: Effect of the architecture on the rheological properties.
Singh, Anirudha.

Synthesis of hyperbranched side-chain liquid crystalline polyacrylates: Effect of the architecture on the rheological properties. - 187 p.

Adviser: Coleen Pugh.

Thesis (Ph.D.)--The University of Akron, 2008.

A new class of inimer (a molecule containing an initiating site and a polymerizable group in the same molecule) was synthesized from a key halohydrin-based intermediate, which was obtained from serine by a diazotization1 synthetic route. Polymerization of these inimers resulted in hyperbranched 2 polyacrylates using the concepts of self-condensing vinyl polymerization (SCVP)3 and atom transfer radical polymerization (ATRP). 4 These hyperbranched polyacrylates contain an ester group attached to every other carbon atom along the polymer backbone, with a non-initiator-containing alkyl ester attached as a free side chain. This is in contrast to previously reported hyperbranched polyacrylates, which have these ester groups along the polymer backbone upon reaction. The architecture of our new polymers is therefore more chemically analogous to linear polyacrylates. We have synthesized and characterized polyacrylates with different ester functional side chains such as alkyl, perfluoro, siloxane, oligo(oxyethylene) and mesogenic side chains5. The hyperbranched side-chain liquid crystalline polyacrylates (SCLCPs) were synthesized and characterized intensively by 1H, 13C and 2D nuclear magnetic resonance (NMR) spectroscopy, matrix assisted laser desorption ionization-time of flight (MALDI-TOF) mass spectrometry, differential scanning calorimetry (DSC), polarized optical microscopy (POM), gel permeation chromatography (GPC), light scattering (LS), solution viscosity and rheological techniques. In this work, the structure was qualitatively analyzed by 1H, 13C and 2D NMR techniques to obtain the branching units6. Solution properties, e.g. radius of gyration and intrinsic viscosity, thermal properties (glass transition and isotropization temperatures) and rhelogical peroperties (isotropic and anisotropic viscosity) of the hyperbranched side-chain liquid crystalline polyacrylate were compared with those of the linear7, three-arm star8, six-arm star9 and comb10 analogues.

ISBN: 9780549554417Subjects--Topical Terms:

1018428
Chemistry, Polymer.

Synthesis of hyperbranched side-chain liquid crystalline polyacrylates: Effect of the architecture on the rheological properties.
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500 $a Source: Dissertation Abstracts International, Volume: 69-03, Section: B, page: 1891.
502 $a Thesis (Ph.D.)--The University of Akron, 2008.
520 $a A new class of inimer (a molecule containing an initiating site and a polymerizable group in the same molecule) was synthesized from a key halohydrin-based intermediate, which was obtained from serine by a diazotization1 synthetic route. Polymerization of these inimers resulted in hyperbranched 2 polyacrylates using the concepts of self-condensing vinyl polymerization (SCVP)3 and atom transfer radical polymerization (ATRP). 4 These hyperbranched polyacrylates contain an ester group attached to every other carbon atom along the polymer backbone, with a non-initiator-containing alkyl ester attached as a free side chain. This is in contrast to previously reported hyperbranched polyacrylates, which have these ester groups along the polymer backbone upon reaction. The architecture of our new polymers is therefore more chemically analogous to linear polyacrylates. We have synthesized and characterized polyacrylates with different ester functional side chains such as alkyl, perfluoro, siloxane, oligo(oxyethylene) and mesogenic side chains5. The hyperbranched side-chain liquid crystalline polyacrylates (SCLCPs) were synthesized and characterized intensively by 1H, 13C and 2D nuclear magnetic resonance (NMR) spectroscopy, matrix assisted laser desorption ionization-time of flight (MALDI-TOF) mass spectrometry, differential scanning calorimetry (DSC), polarized optical microscopy (POM), gel permeation chromatography (GPC), light scattering (LS), solution viscosity and rheological techniques. In this work, the structure was qualitatively analyzed by 1H, 13C and 2D NMR techniques to obtain the branching units6. Solution properties, e.g. radius of gyration and intrinsic viscosity, thermal properties (glass transition and isotropization temperatures) and rhelogical peroperties (isotropic and anisotropic viscosity) of the hyperbranched side-chain liquid crystalline polyacrylate were compared with those of the linear7, three-arm star8, six-arm star9 and comb10 analogues.
520 $a This work provides greater flexibility of synthesizing a variety of hyperbranched functional polyacrylates in a single-pot, single-step reaction and helps us in our understanding of the effect on the physical properties due to architectural differences of the polymers.
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