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Studies on the stability and intermo...

Karst, David T.

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Studies on the stability and intermolecular interactions of cellulose and polylactide systems using molecular modeling.

紀錄類型:	書目-電子資源 : Monograph/item
正題名/作者:	Studies on the stability and intermolecular interactions of cellulose and polylactide systems using molecular modeling./
作者:	Karst, David T.
面頁冊數:	100 p.
附註:	Source: Dissertation Abstracts International, Volume: 67-10, Section: B, page: 5784.
Contained By:	Dissertation Abstracts International67-10B.
標題:	Chemistry, Polymer. -
電子資源:	http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=3237059
ISBN:	9780542908705

Studies on the stability and intermolecular interactions of cellulose and polylactide systems using molecular modeling.
Karst, David T.

Studies on the stability and intermolecular interactions of cellulose and polylactide systems using molecular modeling. - 100 p.

Source: Dissertation Abstracts International, Volume: 67-10, Section: B, page: 5784.

Thesis (Ph.D.)--The University of Nebraska - Lincoln, 2006.

The stability and intermolecular interactions of cellulose and polylactide (PLA) systems were studied using molecular modeling.

ISBN: 9780542908705Subjects--Topical Terms:

1018428
Chemistry, Polymer.

Studies on the stability and intermolecular interactions of cellulose and polylactide systems using molecular modeling.
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245 1 0 $a Studies on the stability and intermolecular interactions of cellulose and polylactide systems using molecular modeling.
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500 $a Source: Dissertation Abstracts International, Volume: 67-10, Section: B, page: 5784.
500 $a Adviser: Yiqi Yang.
502 $a Thesis (Ph.D.)--The University of Nebraska - Lincoln, 2006.
520 $a The stability and intermolecular interactions of cellulose and polylactide (PLA) systems were studied using molecular modeling.
520 $a This work explains how grafting various groups onto cellulose increases hydrolysis of the glycosidic linkages of cellulose. A substituent increases hydrolysis of cellulose by serving as an anchor to the end of the cleaved cellulose to which it is bonded, making it less mobile, and allowing it to have stronger interactions than those in pure hydrolyzed cellulose. Hydrolysis increases with the size of the substituent. Molecules sorbed but not grafted to cellulose do not increase hydrolysis. Hydrolysis mainly occurs at glucoses bonded to the substituent. A substituent on the sixth carbon position of cellulose increases hydrolysis to a greater extent than does one on the second or third carbon position.
520 $a The effect of blending poly(L-lactide) (PLLA) and poly(D-lactide) (PDLA) and the effect of various arrangements of L-lactide and D-lactide in poly(L-lactide-co-D-lactide) on the resistance of polylactide (PLA) to hydrolysis has been explained. Among the homopolymer blends, the 50/50 PLLA/PDLA blend has the greatest resistance to hydrolysis due to its having stronger hydrogen-bonding and van der Waals forces than pure PLLA or PDLA. The change in potential energy for hydrolysis decreases linearly with increasing % PLLA or % PDLA from 0 to 50%. Among the copolymers containing a given percentage of L-lactide and D-lactide, those containing longer blocks of L-lactide and D-lactide have greater resistance to hydrolysis compared to those with shorter blocks or random copolymers because copolymers with longer blocks are more stable before hydrolysis compared to the other copolymers. Among the copolymers with long blocks of L- and D-lactide, those containing 50% L-lactide have a greater resistance to hydrolysis compared to the copolymers with 26% or 74% L-lactide. Blends or copolymers that are mirror images of each other have the same resistance to hydrolysis.
520 $a The effect of the structure of a molecule on its ability to adsorb onto PLA has been explained. The adsorbate-PLA interaction energies calculated for various disperse dyes and drugs agree with experimental data for their percent sorption onto PLA.
590 $a School code: 0138.
650 4 $a Chemistry, Polymer. $3 1018428
650 4 $a Engineering, Materials Science. $3 1017759
650 4 $a Textile Technology. $3 1020710
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710 2 0 $a The University of Nebraska - Lincoln. $3 1024939
773 0 $t Dissertation Abstracts International $g 67-10B.
790 1 0 $a Yang, Yiqi, $e advisor
790 $a 0138
791 $a Ph.D.
792 $a 2006
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