Modified polylactic acid fibers

摘要: A method for forming biodegradable fibers is provided. The includes blending polylactic acid with a polyepoxide modifier to form thermoplastic composition, extruding the composition through die, and thereafter passing extruded die fiber. Without intending be limited by theory, it believed that reacts results in branching of its polymer backbone, thereby improving melt strength stability during fiber spinning without significantly reducing glass transition temperature. reaction-induced can also increase molecular weight, which may lead improved ductility ability better dissipate energy when subjected an elongation force. To minimize premature reaction, are first blended together at relatively low temperature(s). Nevertheless, high shear rate employed induce chain scission making more hydroxyl and/or carboxyl groups available subsequent reaction modifier. Once blended, temperature(s) extrusion selected both initiate acid. Through selective control over this method, present inventors have discovered resulting exhibit good mechanical properties, after spinning.