具有可调机械性能的电子束交联聚氨酯形状记忆聚合物。

Hearon Keith, Nash Landon D, Volk Brent L, Ware Taylor, Lewicki James P, Voit Walter E, Wilson Thomas S, Maitland Duncan J

Department of Biomedical Engineering, Texas A&M University, College Station, TX 77843, USA.

Materials Science and Engineering Program, Texas A&M University, College Station, TX 77843, USA.

Macromol Chem Phys. 2013 Jun 1;214(11):1258-1272. doi: 10.1002/macp.201200348.

Novel electron beam crosslinked polyurethane shape memory polymers with advanced processing capabilities and tunable thermomechanical properties have been synthesized and characterized. We demonstrate the ability to manipulate crosslink density in order to finely tune rubbery modulus, strain capacity, ultimate tensile strength, recovery stress, and glass transition temperature. This objective is accomplished for the first time in a low-molecular-weight polymer system through the precise engineering of thermoplastic resin precursors suitable for mass thermoplastic processing. Neurovascular stent prototypes were fabricated by dip-coating and laser machining to demonstrate processability.

新型电子束交联聚氨酯形状记忆聚合物已被合成并表征，其具有先进的加工能力和可调节的热机械性能。我们展示了控制交联密度以精确调节橡胶模量、应变能力、极限拉伸强度、回复应力和玻璃化转变温度的能力。通过对适用于大规模热塑性加工的热塑性树脂前体进行精确设计，首次在低分子量聚合物体系中实现了这一目标。通过浸涂和激光加工制备了神经血管支架原型，以展示其可加工性。