Journal
MACROMOLECULAR RAPID COMMUNICATIONS
Volume 33, Issue 23, Pages 2041-2045Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/marc.201200485
Keywords
amphiphilic graft copolymer; polyhydroxyalkanoate; thiol-ene chemistry
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We present a straightforward method to prepare amphiphilic graft copolymers consisting of hydrophobic poly(3-hydroxyalkanoates) (PHAs) backbone and hydrophilic a-amino-?-methoxy poly(oxyethylene-co-oxypropylene) (Jeffamine (R)) units. Poly(3-hydroxyoctanoate)-co-(3-hydroxyundecenoate) (PHOU) was first methanolyzed to obtain the desired molar mass. The amino end groups of Jeffamine were converted into thiol by a reaction with N-acetylhomocysteine thiolactone and subsequently photografted. This one-pot functionalization prevents from arduous and time-consuming functionalization of the hydrophilic precursor or tedious modifications of PHAs, thus simplifying the process. The amphiphilic nature of modified PHAs leads to water-soluble copolymers exhibiting thermoresponsive behavior.
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