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Synthesis and Properties of Degradable Copolymers Composed of Poly( ε ‐caprolactone) and 3,4‐Dihydroxycinnamic Acid
Author(s) -
Li Jihang,
Shi Dongjian,
Xu Huaqing,
Hu Na,
Dong Weifu,
Chen Mingqing
Publication year - 2012
Publication title -
chinese journal of chemistry
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.28
H-Index - 41
eISSN - 1614-7065
pISSN - 1001-604X
DOI - 10.1002/cjoc.201200457
Subject(s) - copolymer , differential scanning calorimetry , chemistry , polymer chemistry , condensation polymer , thermal stability , fourier transform infrared spectroscopy , caprolactone , polymer , branching (polymer chemistry) , hydrolysis , chemical engineering , organic chemistry , physics , engineering , thermodynamics
Photoreactive and degradable hyperbranched (HB) copolymers with various 3,4‐dihydroxycinnamic acid (DHCA) compositions, poly( ε ‐caprolactone)‐ co ‐poly(3,4‐dihydroxycinnamic acid) (PCL‐ co ‐PDHCA), were obtained by thermal melt‐polycondensation of PCL and DHCA. The HB structures and the branching degree (BD) of the PCL‐ co ‐PDHCA copolymers were confirmed by Fourier transform infrared spectroscopy (FTIR) and nuclear magnetic resonance ( 1 H NMR). The melting points ( T m ) of the PCL‐ co ‐PDHCA copolymers changed depending on the PCL and DHCA composition by differential scanning calorimetry (DSC) measurements. Wide angle X‐ray diffraction (WXRD) analysis showed semi‐crystalline of the PCL and PCL‐ co ‐PDHCA polymers. The PCL‐ co ‐PDHCA copolymers showed good photoreactivities and fluorescent properties. Crosslinking of the cinnamoyl groups in the copolymers caused by UV irradiation affected the thermal stability and wettability slightly. Moreover, the hydrolysis experiments revealed that copolymers are facile degradable.