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January 24, 2010 | History

Strained polycarbonate-polyurethanes with linear and branched diisocyanates 1 edition

Strained polycarbonate-polyurethanes with linear and branched diisocya ...
Laura Ruth Kuhn

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Strained polycarbonate-polyurethanes with linear and branched diisocyanates
an in vitro biodegradation study.

Published 2005 .
Written in English.

About the Book

This thesis investigates linear (hexane diisocyanate, HDI) versus branched (lysine diisocyanate, LDI) hard segments, and strain effects on hydrogen bonding (HB) and biodegradation in two 14C-materials. One contained pure HDI hard-segments (100%HDI) and the other (75%HDI) was a 3:1 blend of two polymers: 100%HDI and 100%LDI (polymer containing only LDI hard-segments). HB was determined using infrared spectroscopy (under strain, 0-15%). Biodegradation was conducted by exposing polymer films at the above strains to a macrophage-like cell line and 14C-release monitored. With higher molecular weight materials (>105 polystyrene equiv.), 75%HDI degraded < 100%HDI (p < 0.05). With lower molecular weight materials than the above, 75%HDI degraded six times > 100%HDI (p < 0.05). No statistical differences in degradation were found for the strain levels despite their evident differences in HB. Mathematical modeling of intramolecular interactions suggested that chain rearrangements for hard and soft segments accounted for the observations in the degradation studies.

Edition Notes

Source: Masters Abstracts International, Volume: 44-02, page: 0958.

Thesis (M.A.Sc.)--University of Toronto, 2005.

Electronic version licensed for access by U. of T. users.

GERSTEIN MICROTEXT copy on microfiche (2 microfiches).

The Physical Object

131 leaves.
Number of pages

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