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Formation of hybrid structures by co...

Lin, Yan.

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Formation of hybrid structures by controlled photopolymerizations.

紀錄類型:	書目-電子資源 : Monograph/item
正題名/作者:	Formation of hybrid structures by controlled photopolymerizations./
作者:	Lin, Yan.
面頁冊數:	238 p.
附註:	Source: Dissertation Abstracts International, Volume: 66-03, Section: B, page: 1592.
Contained By:	Dissertation Abstracts International66-03B.
標題:	Engineering, Chemical. -
電子資源:	http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=3168284
ISBN:	0542041049

Formation of hybrid structures by controlled photopolymerizations.
Lin, Yan.

Formation of hybrid structures by controlled photopolymerizations. - 238 p.

Source: Dissertation Abstracts International, Volume: 66-03, Section: B, page: 1592.

Thesis (Ph.D.)--University of Colorado at Boulder, 2005.

By taking monomers that polymerize by separate initiation mechanisms, e.g. free radical or cationic, hybrid structures can be produced with the potential to synergistically combine the properties of the two constituent homopolymers. This work involves studies of the synthesis process of a hybrid polymer based on methacrylate/vinyl ether comonomer system. Understanding what parameters can be used in the control of the selected hybrid photopolymerization process, as well as how the kinetics affect resultant material properties is important in designing and optimizing this type of polymeric materials for specific applications.

ISBN: 0542041049Subjects--Topical Terms:

1018531
Engineering, Chemical.

Formation of hybrid structures by controlled photopolymerizations.
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500 $a Source: Dissertation Abstracts International, Volume: 66-03, Section: B, page: 1592.
500 $a Director: Jeffrey W. Stansbury.
502 $a Thesis (Ph.D.)--University of Colorado at Boulder, 2005.
520 $a By taking monomers that polymerize by separate initiation mechanisms, e.g. free radical or cationic, hybrid structures can be produced with the potential to synergistically combine the properties of the two constituent homopolymers. This work involves studies of the synthesis process of a hybrid polymer based on methacrylate/vinyl ether comonomer system. Understanding what parameters can be used in the control of the selected hybrid photopolymerization process, as well as how the kinetics affect resultant material properties is important in designing and optimizing this type of polymeric materials for specific applications.
520 $a First, the potential of real-time FT-near-infrared (NIR) spectroscopy for monitoring individual monomer photopolymerization kinetics within the selected hybrid systems is evaluated. The effect of UV-initiated photopolymerization processing conditions, such as light intensity, photoinitiator type and concentrations, on the hybrid polymerization behavior is explored such that comonomers that polymerize by different mechanisms can be concurrently or sequentially polymerized. In addition, the use of NIR spectroscopy is extended to assess quantitatively the concentration of water absorbed in hybrid systems as polymerization occurs as well as to determine the impact of moisture as a variable in both homopolymerization and hybrid photopolymerization processes.
520 $a With respect to hybrid systems, unique opportunities exist to address the challenge of achieving materials with both high degrees of conversion and reduced shrinkage. Therefore, a modified linometer is coupled with NIR spectroscopy to simultaneously monitor polymerization kinetics and volume shrinkage over time within the same specimen to gain insight into the polymerization shrinkage evolution mechanisms with respect to the influences of polymerization kinetics and exothermic nature, and eventually, to help the development of new strategies to reduce shrinkage without compromise to conversion. In particular, the potential is examined for a sequential photopolymerization process to produce less polymerization shrinkage but adequate final conversion in the selected hybrid systems compared with either a typical simultaneous polymerization process of the same hybrid system or the corresponding constituent homopolymerization processes.
520 $a Finally, we also hope to understand better the structure/property relationship in the selected hybrid systems by investigating how polymerization conditions and double bond conversion affect the final polymer morphology and mechanical properties.
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