Crosslinking of microbial copolyesters with pendant epoxide groups by diamine

• Published in: Polymer (Guilford) Vol. 40; no. 13; pp. 3787 - 3793
• Main Authors: Lee, Moon Yeun, Cha, Soon Young, Park, Won Ho
• Format: Journal Article
• Language: English
• Published: Oxford Elsevier Ltd 01.06.1999; Elsevier
• Subjects: Applied sciences; Chemical reactions and properties; Crosslinking; Crosslinking, vulcanization; Exact sciences and technology; Glass transition temperature; Organic polymers; Physicochemistry of polymers; Poly(3-hydroxyalkanoate)s; Crosslinking; Glass transition temperature; Poly(3-hydroxyalkanoate)s; Experimental study; Functional polymer; Crosslinked copolymer; Diamine; Ester copolymer; Microbial origin; Dynamic mechanical properties; Epoxide; Heat of reaction; Chemical reactivity; Activation energy; Aliphatic copolymer
• ISSN: 0032-3861; 1873-2291
• DOI: 10.1016/S0032-3861(98)00612-0

The poly(3-hydroxyoctanoate-co-3-hydroxy-10,11-epoxyundecanoate)s, PHOEs, with epoxide pendant units of 10, 22 and 34 mole% were prepared. The PHOEs were crosslinked with a stoichiometric hexamethylene diamine (HMDA) at 90°C for 0.5–24 h. The crosslinking reaction of PHOE–HMDA system was verified from the glass transition temperature ( T g) increment and the relative storage modulus increment. Higher increment in T g and relative modulus with increasing the amount of epoxide group in the initial PHOE was observed. Activation energies of the crosslinking reaction were determined by use of the Kissinger and the Ozawa methods. The activation energies for the crosslinking reactions have similar values for each sample, regardless of epoxide content in the PHOEs. The values obtained from the Ozawa method were slightly higher than those from the Kissinger method.