Novel graft copolymers with aliphatic polyether and polyester main chains. (19th November 2015)

• Record Type: Journal Article
• Authors: Zhang, Haiping; Jakisch, Lothar; Komber, Hartmut; Häußler, Liane; Voit, Brigitte; Böhme, Frank
• Is Part Of: Polymer. Volume 79(2015)
• Page Start: 232
• Page End: 242
• Publication Date: 2015-11-19
• Subjects: Graft copolymers -- Coupling reactions -- Aliphatic polyether; Polymers -- Periodicals; Polymerization -- Periodicals; Polymères -- Périodiques; Polymérisation -- Périodiques; 547.7
• DOI: 10.1016/j.polymer.2015.10.023
• Languages: English
• ISSNs: 0032-3861

Abstract

Abstract: A series of new graft copolymers was synthesized by a "grafting to" approach, in the course of which the polymer backbone was build up first by a chain extension reaction of polyether or polycaprolactone diols with bis-N-acyl lactams. During the first reaction step, benzoxazinone groups were introduced into the backbone which served as grafting sites for monoamino-terminated polyamide 12 or polystyrene. Chain extension and grafting could be performed successively and with high selectivity in the melt at 180–220 °C. The morphology and the thermo-mechanical behavior of the graft copolymers were strongly influenced by the type of the grafted side chains. Polymers with polyamide grafts exhibited a two phase morphology with a spherulitic superstructure in the micrometer scale. The tensile behavior of these polymers was characterized by a certain elastic component. In contrast, the phase morphology of a polystyrene grafted polymer was much finer. A strong influence on the glass transitions revealed improved compatibility between the components. Pronounced strain hardening was observed during the tensile test of polystyrene grafted samples. Graphical abstract: Highlights: New agents for selective coupling of amino and hydroxyl groups were utilized. Graft copolymers with a PTHF backbone and PA12 or PS grafts were synthesized. The polymer synthesis was carried out in two steps in the melt. Graft copolymers with PA12 grafts exhibited a typical spherulitic superstructure. The graft copolymers showed pronounced elastic behavior.