Study of molecular orientation and phase transition in polymers during the film blowing process /
Processing of semi-crystalline polymers is an ity Microfilm Inc. important part of plastics technology today. Most polymer processing applications involve the simultaneous elects of non-isothermal flow of viscoelastic quids, complex geometries and the influence of molecular orientation and phase tra...
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| Format: | Thesis Book |
| Language: | English |
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[Place of publication not identified] :
[publisher not identified] ;
1998.
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| Subjects: | |
| Online Access: | http://proxy.library.tamu.edu/login?url=http://proquest.umi.com/pqdweb?did=733039571&sid=1&Fmt=2&clientId=2945&RQT=309&VName=PQD |
| Summary: | Processing of semi-crystalline polymers is an ity Microfilm Inc. important part of plastics technology today. Most polymer processing applications involve the simultaneous elects of non-isothermal flow of viscoelastic quids, complex geometries and the influence of molecular orientation and phase transition in polymers. Process simulations using computational tools obviate the need for extensive experiments and helps enhance the understanding of the effects of process variables on the product properties. This work considers the modeling and analysis of quiescent and flow-induced crystallization in semi-crystalline polymers. Results are presented for crystallizing and temperature distribution under quiescent and shear flow conditions using phenomenological models for non-isothermal crystallization kinetics. The analysis is further extended to study the film blowing process. The Elm blowing process is modeled starting from the die region and considering the transition from an amorphous melt to a semi-crystalline polymer. The analysis also includes the elect of cooling the polymer Elm by turbulent air jet during the film blowing process. Results are presented for the viscoelastic fluid bow in the die, the blown film region, and the turbulent air bow around the bubble. |
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| Item Description: | Vita. "Major Subject: Mechanical Engineering". |
| Physical Description: | xv, 156 leaves : illustrations ; 28 cm. |
| Bibliography: | Includes bibliographical references (leaves 139-148). |