Degradable Plastics Are Vulnerable to Cracks
作者机构：John A.Paulson School of Engineering and Applied SciencesKavli Institute for Bionano Science and TechnologyHarvard UniversityCambridgeMA 02138USA State Key Laboratory of Fluid Power and Mechatronic SystemKey Laboratory of Soft Machines and Smart Devices of Zhejiang ProvinceDepartment of Engineering Mechanics&Center for X-MechanicsZhejiang UniversityHangzhou 310027China
出 版 物：《Engineering》 (工程（英文）)
年 卷 期：2021年第7卷第5期
页 面：624-629页
核心收录：
学科分类：0810[工学-信息与通信工程] 0830[工学-环境科学与工程（可授工学、理学、农学学位）] 0808[工学-电气工程] 0817[工学-化学工程与技术] 08[工学] 0807[工学-动力工程及工程热物理] 0805[工学-材料科学与工程（可授工学、理学学位）] 080502[工学-材料学] 0703[理学-化学] 0812[工学-计算机科学与技术（可授工学、理学学位）]
基 金：The work at Harvard University,USA was supported by National Science Foundation(NSF)Materials Research Science and Engineering Centers(MRSEC)(DMR-2011754) X.Yang was a visiting student at Harvard University supported by the China Scholarship Council.J.Steck acknowledges support from the NSF Graduate Research Fellowship(DGE1745303)
主 题：Degradation Plastics Hydrolysis pH Cracking
摘 要：A plastic may degrade in response to a *** kinetics of degradation have long been characterized by the loss of weight and strength over *** methods of gross characterization,however,are misleading when plastic degrades ***,we study heterogeneous degradation in an extreme form:the growth of a crack under the combined action of chemistry and *** applied load opens the crack,exposes the crack front to chemical attack,and causes the crack to outrun gross *** studied the crack growth in polylactic acid(PLA),a polyester in which ester bonds break by *** cut a crack in a PLA film using scissors,tore it using an apparatus,and recorded the crack growth using a camera through a *** our testing range,the crack velocity was insensitive to load but was sensitive to humidity and *** findings will aid the development of degradable plastics for healthcare and sustainability.
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