Journal
JOURNAL OF POLYMERS AND THE ENVIRONMENT
Volume 31, Issue 8, Pages 3688-3699Publisher
SPRINGER
DOI: 10.1007/s10924-023-02857-3
Keywords
Poly(3-hydroxybutyrate-co-3-hydroxyhexanoate); Macroazo initiator; Dimethyl amino ethyl methacrylate; Polymerization kinetics
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A novel macro intermediate based on PHBHHx was synthesized and used in the copolymerization with DMAEMA. A dihydroxy terminated polyester was prepared by reacting methyl amino ethanol with PHBHHx. The hydroxyl ends of the obtained PHBHHx derivatives were capped with 4,4'-azobis cyanopentanoic acid to obtain PHBHHx macroazo initiator (PHBHHx-AI) for free radical copolymerization of DMAEMA at 70(o)C. The synthesized block copolymer showed a steady increase in DMAEMA units as a function of time. The block copolymers were characterized using (1)H NMR, FTIR, DSC and TGA techniques.
A novel macro intermediate based on poly(3-hydroxybutyrate-co-3-hydroxyhexanoate) (PHBHHx) was synthesized for use in the copolymerization with dimethyl amino ethyl methacrylate (DMAEMA). Methyl amino ethanol was reacted with PHBHHx to prepare a dihydroxy terminated polyester. The hydroxyl ends of the obtained PHBHHx derivatives were capped with 4,4'-azobis cyanopentanoic acid to obtain the PHBHHx macroazo initiator (PHBHHx-AI) for free radical copolymerization of DMAEMA at 70(o)C. A steady increase in DMAEMA units in the synthesized block copolymer as a function of time was observed. The overall rate constants for the free radical polymerization of DMAEMA initiated by PHBHHx-AI was k = 2.33 x 10(- 4) Lmol(-1)s(-1). Block copolymers were characterized using the (1) H NMR, FTIR, DSC and TGA techniques.
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