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Processing polymers with cyclodextrins.

Williamson, Brandon Robert.

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Processing polymers with cyclodextrins.

Record Type:	Language materials, printed : Monograph/item
Title/Author:	Processing polymers with cyclodextrins./
Author:	Williamson, Brandon Robert.
Description:	170 p.
Notes:	Source: Dissertation Abstracts International, Volume: 71-11, Section: B, page: 6804.
Contained By:	Dissertation Abstracts International71-11B.
Subject:	Chemistry, Polymer. -
Online resource:	http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=3429708
ISBN:	9781124275871

Processing polymers with cyclodextrins.
Williamson, Brandon Robert.

Processing polymers with cyclodextrins. - 170 p.

Source: Dissertation Abstracts International, Volume: 71-11, Section: B, page: 6804.

Thesis (Ph.D.)--North Carolina State University, 2010.

Cyclodextrins (CDs) are cyclic starch molecules that have the unique ability to include a variety of small molecules and polymers inside their cavities, forming "Inclusion Complexes" (ICs). While much work has been done to understand the formation and behavior of these ICs, far less is known about the fundamental property changes that can occur when CD is used to alter polymer chain morphology. The goal of my graduate research has been to discover different ways to improve upon existing polymer properties through CD processing, as well as explore the possibility of creating a novel type of IC using non-traditional forms of cyclodextrin.

ISBN: 9781124275871Subjects--Topical Terms:

1018428
Chemistry, Polymer.

Processing polymers with cyclodextrins.
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020 $a 9781124275871
035 $a (UMI)AAI3429708
035 $a AAI3429708
040 $a UMI $c UMI
100 1 $a Williamson, Brandon Robert. $3 1678246
245 1 0 $a Processing polymers with cyclodextrins.
300 $a 170 p.
500 $a Source: Dissertation Abstracts International, Volume: 71-11, Section: B, page: 6804.
500 $a Adviser: Alan E. Tonelli.
502 $a Thesis (Ph.D.)--North Carolina State University, 2010.
520 $a Cyclodextrins (CDs) are cyclic starch molecules that have the unique ability to include a variety of small molecules and polymers inside their cavities, forming "Inclusion Complexes" (ICs). While much work has been done to understand the formation and behavior of these ICs, far less is known about the fundamental property changes that can occur when CD is used to alter polymer chain morphology. The goal of my graduate research has been to discover different ways to improve upon existing polymer properties through CD processing, as well as explore the possibility of creating a novel type of IC using non-traditional forms of cyclodextrin.
520 $a Poly(&egr;-caprolactone) (PCL) was processed with alpha-CD to form an IC. The cyclodextrin was then stripped away to yield a PCL with elongated, unentangled, and constrained polymer chains, a process referred to as coalescence. The physical and rheological property changes resulting from this coalescence were then examined. It was found that reorganizing PCL in this manner resulted in an increase in the melt crystallization temperature of up to 25°C. Coalescence also decreased the tan delta of the material and increased the average hardness and Young's modulus by 33 and 53%, respectively.
520 $a Non-stoichiometric ICs (NS-ICs), or ICs with at least parts of some polymer chains uncovered, were formed between poly (methyl methacrylate) (PMMA) and gamma-CD as well as a synthesized poly(&egr;-caprolactone)-poly(propylene glycol)-poly(&egr;-caprolactone) (PCL-PPG-PCL) triblock copolymer and beta-CD. The property changes of the non-complexed polymer chains were then studied. The PMMA/gamma-CD NS-IC samples were determined to be extremely heterogeneous, however glass transition temperature increases of up to 27°C above that of as-received PMMA were observed. Diffraction data for the PMMA NS-ICs suggests slight crystallinity at partial coverage, with a similar crystal structure to that of the fully covered IC. XRD, DSC and FTIR data revealed an almost total disruption of the PCL crystallinity upon complexation of the PCL-PPG-PCL triblock, suggesting possible miscibility of PCL blocks and PPG blocks threaded with beta-CD or partial coverage of the PCL blocks by the beta-CD.
520 $a A non-crystalline and unreactive modified CD, diethylamine-terminated monochloro-triazinyl-beta-CD (DEAMCT), was synthesized from an industrially available beta-CD derivative. DEAMCT was complexed with poly(propylene glycol) (PPG) as well as a poly(ethylene glycol)-poly(propylene glycol)-poly(ethylene glycol) (PEG-PPG-PEG) triblock copolymer (trade name Pluronic). The IC's formed between these polymers and the non-crystalline cyclodextrin derivative were studied with a variety of techniques. Two-dimensional ROESY 1H-NMR demonstrated through-space spin coupling interactions between backbone protons of the PPG and two of the inward-facing cavity protons in the beta-CD cavity, strong evidence for IC formation between these materials. Unexpectedly, these IC's displayed clear X-ray observed crystalline behavior, with long-range order that was comparable for both the DEAMTC- and beta-CD-ICs formed with guest Pluronics. The IC formation with the Pluronic material resulted in the complete disruption of the PEG block crystallinity in a fashion similar to the PCL-PPG-PCL triblock copolymer. Unexpectedly, the aqueous solubility for both the Pluronic and PPG homopolymer decreased upon low-coverage DEAMCT inclusion.
590 $a School code: 0155.
650 4 $a Chemistry, Polymer. $3 1018428
650 4 $a Engineering, Materials Science. $3 1017759
690 $a 0495
690 $a 0794
710 2 $a North Carolina State University. $3 1018772
773 0 $t Dissertation Abstracts International $g 71-11B.
790 1 0 $a Tonelli, Alan E., $e advisor
790 $a 0155
791 $a Ph.D.
792 $a 2010
856 4 0 $u http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=3429708