Journal
POLYMER CHEMISTRY
Volume 5, Issue 9, Pages 3214-3221Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/c4py00178h
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Funding
- National Science Foundation [CHE-0848236, CHE-1305794]
- University of Florida
- Direct For Mathematical & Physical Scien
- Division Of Chemistry [1305794] Funding Source: National Science Foundation
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Monomers structurally resembling lignin were prepared by reacting 4-hydroxybenzaldehyde, vanillin, syringaldehyde, (each bio-available) or ethylvanillin (synthetic) with dibromoethane, yielding dialdehydes CHO-Ar-OCH2CH2O-Ar-CHO. Condensation copolymerization with tetraols catalyzed by paratoluene sulfonic acid yielded polyacetal ethers with cyclic acetals in the case of di-trimethylolpropane (di-TMP) and spirocyclic acetals in the case of pentaerythritol (PTOL). Number average molecular weights (M-n) were in the range of 10600 to 22200, although the insolubility of those polymers based on 4-hydroxybenzaldehyde precluded this measurement. The polymers are thermally robust and exhibit 5% mass loss via thermogravimetric analysis in the range of 307-349 degrees C. Those copolymers based on PTOL displayed glass transition (T-g) temperatures (108-152 degrees C) at least 40 degrees C higher than their di-TMP analogues (68-98 degrees C), highlighting the added rigidity conferred by spirocyclic acetals versus cyclic acetals. Preliminary degradation studies were conducted in dimethyl sulfoxide with 0.5% added aqueous HCl (concentrated or 2 M). Dynamic light scattering confirmed the facile hydrolysis of the polymers. Generally, polymer degradation was faster with a higher acid concentration and copolymers from the PTOL tetraol were more resistant to hydrolysis than those from the di-TMP tetraol.
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