摘要
采用X射线衍射、傅里叶变换红外光谱、差示扫描量热及力学拉伸等多尺度表征手段研究在130℃高温热老化不同时间(0~60d)对聚偏氟乙烯结构和性能的影响。结果表明,在热老化初期,相当于对样品退火处理,退火处理促进了聚偏氟乙烯非晶相至晶相的转变,样品的结晶完善程度和结晶度明显提高,熔融温度向高温偏移,拉伸强度随之提高,但断裂伸长率下降;随着热老化实验进行,高温诱导结晶区域遭到破坏,样品的结晶度下降,熔融温度略有降低,拉伸强度及断裂伸长率均下降,但在整个热老化过程中,聚偏氟乙烯的晶体结构均得以保留。
The crystal structure and mechanical properties of polyvinylidene fluoride (PVDF) can be changed due to the long-term thermal ageing. This phenomenon was studied by XRD, FT-IR, DSC and the mechanical tensile test to obtain the behaviors of polyvinylidene fluoride for 60 d thermal aging at 130 ℃. The results show that the sample is equivalent to the annealing treatment during the initial stage of thermal aging. The annealing process promotes the amorphous to crystalline phase transformation. The crystal perfection and crystallinity of the samples are obviously improved. The melting temperature of the sample shifts towards the high temperature. The tensile strength of the sample increases, while the elongation at break decreases. With the thermal aging test, the crystalline region is destroyed by the high-temperature inducing, the crystallinity of the samples decreases, the melting temperature decreases slightly, and the tensile strength and elongation at break decrease. The crystal structure of PVDF is preserved during the entire thermal aging process.
作者
李震
卢青针
尹原超
阎军
岳前进
张晶
Zhen Li;Qingzhen Lu;Yuanchao Yin;Jun Yan;Qianjin Yue;Jing Zhang(School of Petroleum and Chemical Engineering,Dalian University of Technology,Panjin 124221,China;School of Ocean Science and Technology,Dalian University of Technology,Panjin 124221,China;Department of Engineering Mechanics,Dalian University of Technology,Dalian 116024,China)
出处
《高分子材料科学与工程》
EI
CAS
CSCD
北大核心
2019年第6期40-44,共5页
Polymer Materials Science & Engineering
基金
国家自然科学基金青年科学基金资助项目(51509304)
关键词
聚偏氟乙烯
热老化
结晶结构
力学性能
polyvinylidene fluoride
thermal aging
crystal structure
mechanical properties
