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Synthesis and characterization of lo...

Langston, Justin August.

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Synthesis and characterization of long chain branched isotactic polypropylene via a metallocene catalyst and T-reagent.

紀錄類型:	書目-語言資料,印刷品 : Monograph/item
正題名/作者:	Synthesis and characterization of long chain branched isotactic polypropylene via a metallocene catalyst and T-reagent./
作者:	Langston, Justin August.
面頁冊數:	154 p.
附註:	Source: Dissertation Abstracts International, Volume: 69-01, Section: B, page: 0606.
Contained By:	Dissertation Abstracts International69-01B.
標題:	Chemistry, Polymer. -
電子資源:	http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=3299018
ISBN:	9780549432425

Synthesis and characterization of long chain branched isotactic polypropylene via a metallocene catalyst and T-reagent.
Langston, Justin August.

Synthesis and characterization of long chain branched isotactic polypropylene via a metallocene catalyst and T-reagent. - 154 p.

Source: Dissertation Abstracts International, Volume: 69-01, Section: B, page: 0606.

Thesis (Ph.D.)--The Pennsylvania State University, 2007.

Long chain branched isotactic polypropylene (LCBPP) was synthesized via the combination of a metallocene catalyst, p-(3-butenyl)styrene (T-reagent), and hydrogen. T-reagent, in the presence of hydrogen, simultaneously served as comonomer and chain transfer agent, resulting in a high molecular weight, branched polypropylene. The preparation of LCBPP by the addition of T-reagent was a one-step procedure in which the metallocene catalyst remained highly reactive. To understand the structure-property relationships, a series of LCBPP was prepared with similar weight-average molecular weights of about 250,000 g/mol and branch densities ranging from 0 (linear iPP) to 3.3 branches per 10,000 carbon. SEC equipped with triple detectors revealed the presence of high molecular weight branches whose density depended on the concentration of Treagent, hydrogen, and propylene. Melt properties were examined by small amplitude oscillatory shear and extensional flow measurements. The zero-shear viscosities of LCBPP displayed a systematic increase as branch density increased despite similar molecular weights. Strain hardening was observed in extensional flow of LCBPP. Because of these melt properties, the LCBPP and other branched polypropylenes displayed the ability to retain orientation after high temperature (T > Tm) deformations.

ISBN: 9780549432425Subjects--Topical Terms:

1018428
Chemistry, Polymer.

Synthesis and characterization of long chain branched isotactic polypropylene via a metallocene catalyst and T-reagent.
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520 $a Long chain branched isotactic polypropylene (LCBPP) was synthesized via the combination of a metallocene catalyst, p-(3-butenyl)styrene (T-reagent), and hydrogen. T-reagent, in the presence of hydrogen, simultaneously served as comonomer and chain transfer agent, resulting in a high molecular weight, branched polypropylene. The preparation of LCBPP by the addition of T-reagent was a one-step procedure in which the metallocene catalyst remained highly reactive. To understand the structure-property relationships, a series of LCBPP was prepared with similar weight-average molecular weights of about 250,000 g/mol and branch densities ranging from 0 (linear iPP) to 3.3 branches per 10,000 carbon. SEC equipped with triple detectors revealed the presence of high molecular weight branches whose density depended on the concentration of Treagent, hydrogen, and propylene. Melt properties were examined by small amplitude oscillatory shear and extensional flow measurements. The zero-shear viscosities of LCBPP displayed a systematic increase as branch density increased despite similar molecular weights. Strain hardening was observed in extensional flow of LCBPP. Because of these melt properties, the LCBPP and other branched polypropylenes displayed the ability to retain orientation after high temperature (T > Tm) deformations.
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