Journal
MACROMOLECULES
Volume 37, Issue 4, Pages 1180-1189Publisher
AMER CHEMICAL SOC
DOI: 10.1021/ma035289u
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A series of N-terminus amino acid and peptide branched, chiral polyolefins, termed bioolefins, have been prepared using acyclic diene metathesis (ADMET) polycondensation chemistry, using a minimal amount of solvent and Grubbs' second generation catalyst. The carboxylic acid functional groups were protected with methyl, benzyl, and tert-butyl esters to enhance both the polymerizability of the monomers themselves and the solubility of the resulting polymers. A number of these polymers are semicrystalline, exhibiting melt transitions of up to 132 and 74 degreesC for the amino acid and dipeptide branched polymers, respectively. Adding a succinic acid spacer between the amino acid entity and the polymer backbone alters the melting behavior of the polymer, increasing the peak melting point by 27 degreesC when compared to a polymer having the same amino acid directly attached to the polymer backbone.
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