美国科学家研制出一种通电后可伸缩的新材料，这种共聚物材料在强电场作用下能够发生较大的变形。可用于制造医学成像设备、水下探测装置、立体扬声器、电容器等，将来还有可能用于制造人工皮肤、肌肉和器官。美国宾夕法尼亚州材料研究实验室的研究人员在7月3日一期美国《科学 American scientists have developed a new material that can be retractable after power-on. This copolymer material can undergo large deformation under strong electric field. Can be used to make medical imaging equipment, underwater detection devices, stereo speakers, capacitors, etc., in the future may also be used to make artificial skin, muscles and organs. Researchers at the Pennsylvania Materials Research Laboratory in the United States on July 3 a "Science