Novel graft copolymers with aliphatic polyether and polyester main chains

作者：Zhang Haiping; Jakisch Lothar; Komber Hartmut; Haeussler Liane; Voit Brigitte; Boehme Frank

来源：Polymer, 2015, 79: 232-242.

DOI：10.1016/j.polymer.2015.10.023

• Graft copolymers
• Coupling reactions
• Aliphatic polyether

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 degrees 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.

• 出版日期2015-11-19