CTA III: A Third Polymorph of Cellulose Triacetate

X-ray diffraction (XRD) of cellulose acetate (CA; degree of substitution >2.4) fibers stretched in solvent suggests the existence of a third polymorph of cellulose triacetate (CTA). Comparison of these results with patterns from model structures indicates that it has an antiparallel two-chain uni...

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Published in:	Journal of carbohydrate chemistry Vol. 32; no. 2; pp. 120 - 138
Main Authors:	Braun, Jennifer L., Kadla, John F.
Format:	Journal Article
Language:	English
Published:	Philadelphia Taylor & Francis Group 12-02-2013 Taylor & Francis Ltd
Subjects:	Carbohydrates Cellulose Cellulose acetate Crystal Crystals CTA III Degree of substitution Differential scanning calorimetry Diffraction DSC Fibers Heat of fusion Melting temperature Monomers Polymorph Solvents X-ray diffraction XRD
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Abstract	X-ray diffraction (XRD) of cellulose acetate (CA; degree of substitution >2.4) fibers stretched in solvent suggests the existence of a third polymorph of cellulose triacetate (CTA). Comparison of these results with patterns from model structures indicates that it has an antiparallel two-chain unit cell with space group P2 1 22 1 . XRD, differential scanning calorimetry (DSC), and modeling results have shown that the polymorph forms small crystallites, which are less stable than CTA I and CTA II. DSC studies of CA with different degrees of substitution suggest that CTA III forms when the number of contiguous triacetylated monomers is less than the minimum sequence length required for formation of CTA II.
AbstractList	X-ray diffraction (XRD) of cellulose acetate (CA; degree of substitution >2.4) fibers stretched in solvent suggests the existence of a third polymorph of cellulose triacetate (CTA). Comparison of these results with patterns from model structures indicates that it has an antiparallel two-chain unit cell with space group P21221. XRD, differential scanning calorimetry (DSC), and modeling results have shown that the polymorph forms small crystallites, which are less stable than CTA I and CTA II. DSC studies of CA with different degrees of substitution suggest that CTA III forms when the number of contiguous triacetylated monomers is less than the minimum sequence length required for formation of CTA II. [PUBLICATION ABSTRACT] X-ray diffraction (XRD) of cellulose acetate (CA; degree of substitution >2.4) fibers stretched in solvent suggests the existence of a third polymorph of cellulose triacetate (CTA). Comparison of these results with patterns from model structures indicates that it has an antiparallel two-chain unit cell with space group P2 1 22 1 . XRD, differential scanning calorimetry (DSC), and modeling results have shown that the polymorph forms small crystallites, which are less stable than CTA I and CTA II. DSC studies of CA with different degrees of substitution suggest that CTA III forms when the number of contiguous triacetylated monomers is less than the minimum sequence length required for formation of CTA II. X-ray diffraction (XRD) of cellulose acetate (CA; degree of substitution >2.4) fibers stretched in solvent suggests the existence of a third polymorph of cellulose triacetate (CTA). Comparison of these results with patterns from model structures indicates that it has an antiparallel two-chain unit cell with space group P2 sub(1)22 sub(1). XRD, differential scanning calorimetry (DSC), and modeling results have shown that the polymorph forms small crystallites, which are less stable than CTA I and CTA II. DSC studies of CA with different degrees of substitution suggest that CTA III forms when the number of contiguous triacetylated monomers is less than the minimum sequence length required for formation of CTA II.
Author	Kadla, John F. Braun, Jennifer L.
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SubjectTerms	Carbohydrates Cellulose Cellulose acetate Crystal Crystals CTA III Degree of substitution Differential scanning calorimetry Diffraction DSC Fibers Heat of fusion Melting temperature Monomers Polymorph Solvents X-ray diffraction XRD
Title	CTA III: A Third Polymorph of Cellulose Triacetate
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