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Development of high-performance diam...

Allen, Douglas James.

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Development of high-performance diamine-based polybenzoxazines.

紀錄類型:	書目-語言資料,印刷品 : Monograph/item
正題名/作者:	Development of high-performance diamine-based polybenzoxazines./
作者:	Allen, Douglas James.
面頁冊數:	174 p.
附註:	Adviser: Hatsuo Ishida.
Contained By:	Dissertation Abstracts International64-05B.
標題:	Chemistry, Polymer. -
電子資源:	http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=3091994
ISBN:	9780496397020

Development of high-performance diamine-based polybenzoxazines.
Allen, Douglas James.

Development of high-performance diamine-based polybenzoxazines. - 174 p.

Adviser: Hatsuo Ishida.

Thesis (Ph.D.)--Case Western Reserve University, 2003.

A series of linear aliphatic diamine-based benzoxazine monomers has been synthesized and characterized. These benzoxazine monomers polymerize at elevated temperatures into transparent, crosslinked materials with an inherently flexible network structure. These aliphatic diamine-based benzoxazines are atypical in that polyfunctionality is provided by the amine portion of the benzoxazine structure, rather than by a multifunctional phenol as is more conventional utilized.

ISBN: 9780496397020Subjects--Topical Terms:

1018428
Chemistry, Polymer.

Development of high-performance diamine-based polybenzoxazines.
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100 1 $a Allen, Douglas James. $3 1264961
245 1 0 $a Development of high-performance diamine-based polybenzoxazines.
300 $a 174 p.
500 $a Adviser: Hatsuo Ishida.
500 $a Source: Dissertation Abstracts International, Volume: 64-05, Section: B, page: 2209.
502 $a Thesis (Ph.D.)--Case Western Reserve University, 2003.
520 $a A series of linear aliphatic diamine-based benzoxazine monomers has been synthesized and characterized. These benzoxazine monomers polymerize at elevated temperatures into transparent, crosslinked materials with an inherently flexible network structure. These aliphatic diamine-based benzoxazines are atypical in that polyfunctionality is provided by the amine portion of the benzoxazine structure, rather than by a multifunctional phenol as is more conventional utilized.
520 $a The kinetics of thermally activated polymerization for this series of diamine-based benzoxazine monomers is investigated by infrared spectroscopy and reveals that the rate of polymerization is inversely proportional to the length of the aliphatic diamine chain. The monomer based on the shortest diamine, ethylene diamine, is shown by differential scanning calorimetry to polymerize by a dual-mode process with an onset temperature that is lower than ever previously seen for bisphenol-based benzoxazines. The normalized heat of polymerization for monomers based on longer diamines is largely independent of the diamine chain length.
520 $a The polybenzoxazines that are prepared from the linear aliphatic diamine-based benzoxazine monomers display a high degree of inherent flexibility, with mechanical and physical properties that strongly depend on the length of the aliphatic chain. Despite the flexible nature of the diamine chains, several of the aliphatic diamine-based polybenzoxazines have high glass transition temperatures and crosslink densities that exceed those of typical bisphenol-based polybenzoxazines.
520 $a By selective blocking of the ortho, para, and meta reactive sites on the aromatic ring with a series of methyl-substituted monomers, polymerization is regiospecified and the type of linkage in the network structure is controlled. The substituted benzoxazines are shown to polymerize by similar mechanisms and possess a heat of polymerization by differential scanning calorimetry that is independent of both diamine chain length and phenol substitution. The methyl substitution on the aliphatic diamine-based monomers decreases their rate of polymerization but significantly increase the conversion required to reach the point of gelation. A comparison of the properties of the model networks to those based on unsubstituted phenol provides evidence that suggests that the unsubstituted polybenzoxazine network structure contains linkages at both the ortho and para positions on the aromatic ring.
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710 2 $a Case Western Reserve University. $3 1017714
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791 $a Ph.D.
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