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I. Direct observation of zirconocene...

Tomasik, Janice Hall.

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I. Direct observation of zirconocene-catalyzed alkene polymerization via NMR and the role of an aluminum alkyl during polymerization. II. Design and evaluation of an online nanoscience course for teachers.

紀錄類型:	書目-語言資料,印刷品 : Monograph/item
正題名/作者:	I. Direct observation of zirconocene-catalyzed alkene polymerization via NMR and the role of an aluminum alkyl during polymerization. II. Design and evaluation of an online nanoscience course for teachers./
作者:	Tomasik, Janice Hall.
面頁冊數:	248 p.
附註:	Advisers: Clark R. Landis; John W. Moore.
Contained By:	Dissertation Abstracts International68-12B.
標題:	Chemistry, Inorganic. -
電子資源:	http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=3294173
ISBN:	9780549384113

I. Direct observation of zirconocene-catalyzed alkene polymerization via NMR and the role of an aluminum alkyl during polymerization. II. Design and evaluation of an online nanoscience course for teachers.
Tomasik, Janice Hall.

I. Direct observation of zirconocene-catalyzed alkene polymerization via NMR and the role of an aluminum alkyl during polymerization. II. Design and evaluation of an online nanoscience course for teachers. - 248 p.

Advisers: Clark R. Landis; John W. Moore.

Thesis (Ph.D.)--The University of Wisconsin - Madison, 2007.

The plastics industry has been revolutionalized by development of group 4 metallocene polymerization catalysts. These catalysts have higher activities and stereoselectivities than traditional heterogeneous Ziegler-Natta polymerization catalysts, and produce polymers with narrower molecular weight distributions and with better control of the polymer stereochemistry. The reaction kinetics of catalytic alkene polymerizations are complicated and difficult to resolve macroscopically. To overcome these difficulties, research has used NMR spectroscopy to directly observe catalytic reaction intermediates; many advances in our understanding of the complex mechanisms behind these polymerization reactions have resulted.

ISBN: 9780549384113Subjects--Topical Terms:

517253
Chemistry, Inorganic.

I. Direct observation of zirconocene-catalyzed alkene polymerization via NMR and the role of an aluminum alkyl during polymerization. II. Design and evaluation of an online nanoscience course for teachers.
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245 1 0 $a I. Direct observation of zirconocene-catalyzed alkene polymerization via NMR and the role of an aluminum alkyl during polymerization. II. Design and evaluation of an online nanoscience course for teachers.
300 $a 248 p.
500 $a Advisers: Clark R. Landis; John W. Moore.
500 $a Source: Dissertation Abstracts International, Volume: 68-12, Section: B, page: 8025.
502 $a Thesis (Ph.D.)--The University of Wisconsin - Madison, 2007.
520 $a The plastics industry has been revolutionalized by development of group 4 metallocene polymerization catalysts. These catalysts have higher activities and stereoselectivities than traditional heterogeneous Ziegler-Natta polymerization catalysts, and produce polymers with narrower molecular weight distributions and with better control of the polymer stereochemistry. The reaction kinetics of catalytic alkene polymerizations are complicated and difficult to resolve macroscopically. To overcome these difficulties, research has used NMR spectroscopy to directly observe catalytic reaction intermediates; many advances in our understanding of the complex mechanisms behind these polymerization reactions have resulted.
520 $a In this work, the direct observation of alkene insertion into zirconocene-polymeryls via NMR spectroscopy is presented. Alkenes studied are 3-methylpentene, styrene, and 1,4-pentadiene. Kinetic measurements are reported for the polymerization of 3-methylpentene by rac-(EBI)Zr(Me)(MeB(C6F 5)3) (EBI = C2H4(1-indenyl)2) and rac-(EBI)Zr(polyhexenyl)(MeB(C6F5) 3). Also presented are NMR spectroscopic characterizations of rac-(EBI)Zr(styrenyl)(MeB(C6F5)3) and rac-(EBI)Zr(1,4-pentadienyl)(MeB(C6F 5)3).
520 $a In addition, NMR spectroscopy is used to directly monitor the behavior of an aluminum alkyl during the polymerization of 1-hexene by rac -(EBI)2Zr(Me)(MeB(C6F5)3). The rates of polymerization are not inhibited by Al(iBu) 2(BHT), Al(Me)(BHT)2, or Al(iBu)3 (BHT = 2,6-di- tert-butyl-4-methylphenyl). Detailed measurement of polymerization rate and catalyst speciation demonstrate that BHT modified aluminum alkyls protect active sites from decomposition in the presence of protic impurities such as methanol.
520 $a Also presented in this work is the design and evaluation of an online course for teachers about nanoscience. Nanotechnology is an important emerging field that is estimated to need about 2 million workers worldwide by 2015. Therefore the educational system is being encouraged to incorporate major nanoscience concepts into curricula. In order to facilitate the integration of nanoscience, an online professional development course for teachers has been developed and offered at the University of Wisconsin-Madison. Evaluation results from the first three versions of the course indicate the online learning environment was very close to ideal. Comparisons of pre-instruction to post-instruction quiz responses indicate significant learning gains by participants. Importantly, survey results show the online course helped teachers to successfully incorporate nanoscience into their curricula.
590 $a School code: 0262.
650 4 $a Chemistry, Inorganic. $3 517253
650 4 $a Chemistry, Polymer. $3 1018428
650 4 $a Education, Sciences. $3 1017897
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