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Renewable, degradable polymers for p...

Schreck, Kathleen Mary.

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Renewable, degradable polymers for polylactide toughening.

Record Type:	Language materials, printed : Monograph/item
Title/Author:	Renewable, degradable polymers for polylactide toughening./
Author:	Schreck, Kathleen Mary.
Description:	181 p.
Notes:	Adviser: Marc A. Hillmyer.
Contained By:	Dissertation Abstracts International68-03B.
Subject:	Chemistry, Polymer. -
Online resource:	http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=3256886

Renewable, degradable polymers for polylactide toughening.
Schreck, Kathleen Mary.

Renewable, degradable polymers for polylactide toughening. - 181 p.

Adviser: Marc A. Hillmyer.

Thesis (Ph.D.)--University of Minnesota, 2007.

Polylactide (PLA) is a biodegradable polyester obtained commercially by polymerization of lactide, the cyclic dimer of lactic acid. Available entirely from renewable resource feedstocks, PLA is currently marketed for a variety of applications such as degradable sutures, food packaging, and textile products. However, the inherent brittleness of homopolymer PLA limits its use in applications where mechanical toughness is required (for instance appliance casings and car parts). Toughening schemes have been developed that significantly improve PLA mechanical properties, but the additives employed are generally petroleum-derived or non-degradable. Hence, the work in this thesis focuses on developing toughened PLA composites that retain the benefits of complete degradability and renewable origins by incorporating other environmentally benign plastics.Subjects--Topical Terms:

1018428
Chemistry, Polymer.

Renewable, degradable polymers for polylactide toughening.
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035 $a (UMI)AAI3256886
035 $a AAI3256886
040 $a UMI $c UMI
100 1 $a Schreck, Kathleen Mary. $3 1280695
245 1 0 $a Renewable, degradable polymers for polylactide toughening.
300 $a 181 p.
500 $a Adviser: Marc A. Hillmyer.
500 $a Source: Dissertation Abstracts International, Volume: 68-03, Section: B, page: 1666.
502 $a Thesis (Ph.D.)--University of Minnesota, 2007.
520 $a Polylactide (PLA) is a biodegradable polyester obtained commercially by polymerization of lactide, the cyclic dimer of lactic acid. Available entirely from renewable resource feedstocks, PLA is currently marketed for a variety of applications such as degradable sutures, food packaging, and textile products. However, the inherent brittleness of homopolymer PLA limits its use in applications where mechanical toughness is required (for instance appliance casings and car parts). Toughening schemes have been developed that significantly improve PLA mechanical properties, but the additives employed are generally petroleum-derived or non-degradable. Hence, the work in this thesis focuses on developing toughened PLA composites that retain the benefits of complete degradability and renewable origins by incorporating other environmentally benign plastics.
520 $a The research described herein investigates the preparation of PLA-based materials incorporating Nodax(TM), poly(alpha-methyl-beta-pentyl-beta-propiolactone) (PMPP), and polyisoprene (PI). Nodax(TM), a naturally occurring microbial polyester produced by Procter & Gamble, was investigated because its large-scale commercial production makes it one of the few readily available renewable resource-based, biodegradable polymers. The preparation of Nodax-PLA block copolymers and melt blends is discussed in Chapter 2. PMPP is an aliphatic polyester obtained by the ring opening polymerization of the corresponding beta-lactone, MPP, which can be derived from renewable resources. The synthesis of MPP, its polymerization by a discrete zinc alkoxide catalyst, and the properties of the resulting polymer are disclosed in Chapter 3. Finally, the preparation and mechanical properties of PLA composites containing block copolymers of PLA and polyisoprene, a natural rubber surrogate, are investigated in Chapter 4.
590 $a School code: 0130.
650 4 $a Chemistry, Polymer. $3 1018428
690 $a 0495
710 2 $a University of Minnesota. $3 676231
773 0 $t Dissertation Abstracts International $g 68-03B.
790 $a 0130
790 1 0 $a Hillmyer, Marc A., $e advisor
791 $a Ph.D.
792 $a 2007
856 4 0 $u http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=3256886