Synthesis and properties of semi-crystalline hyperbranched poly(ester-amide) grafted with long alkyl chains used for UV-curable powder coatings

• Published in: Progress in organic coatings Vol. 59; no. 4; pp. 284 - 290
• Main Authors: Cheng, Xi-e, Huang, Zhanguang, Liu, Jianhua, Shi, Wenfang
• Format: Journal Article
• Language: English
• Published: Lausanne Elsevier B.V 01.07.2007; Elsevier Sequoia
• Subjects: Applied sciences; Exact sciences and technology; Hyperbranched poly(ester-amide); Organic polymers; Physicochemistry of polymers; Polymerization; Powder coating; Preparation, kinetics, thermodynamics, mechanism and catalysts; Semi-crystalline; UV curing; UV curing; Hyperbranched poly(ester-amide); Powder coating; Semi-crystalline; Coating material; Paint
• ISSN: 0300-9440; 1873-331X
• DOI: 10.1016/j.porgcoat.2007.04.003

A series of semi-crystalline hyperbranched poly(ester-amide)s by modifying hydroxyl end groups of hyperbranched poly(ester-amide) (HP) with IPDI-C18 and IPDI-HEA in different ratios were synthesized and characterized by FTIR, NMR and GPC. Their crystallization behaviors and thermal properties determined by X-ray diffraction (XRD) and differential scanning calorimetry (DSC) showed that the high substitution degree of hydroxyl groups of hyperbranched poly(ester-amide) (HP) with IPDI-C18 resulted in higher degree of crystallization and thus glass transition temperature ( T g) up to 43 °C. The photopolymerization kinetics investigated by photo-DSC showed that the obtained semi-crystalline hyperbranched resins have high photopolymerization rate and final unsaturation conversion, which is very promising for UV-curable powder coating applications.