Journal
MACROMOLECULAR RAPID COMMUNICATIONS
Volume 35, Issue 18, Pages 1611-1614Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/marc.201400271
Keywords
depolymerization; materials; mechanochemistry; polymers
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Funding
- University of Washington
- University of Washington Royalty Research Fund
- Army Research Office Young Investigator Program [W911NF-11-1-0289]
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The kinetics of mechanochemical chain scission of poly(phthalaldehyde) (PPA) are investigated. Ultrasound-induced cavitation is capable of causing chain scission in the PPA backbone that ultimately leads to rapid depolymerization of each resulting polymer fragment when above the polymer's ceiling temperature (T-c). An interesting feature of the mechanochemical breakdown of PPA is that half-chain daughter fragments are not observed, since the depolymerization is rapid following chain scission. These features facilitate the determination of rate constants of activation for multiple molecular weights from a single sonication experiment. Additionally, the degradation kinetics are modified with chain-end trapping agents through variation of the nature and amount of small molecule nucleophile or electrophile.
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