AN Zhen-hua1, ZHAO Dong-yan2, YE Yan1, YANG Rui1*, WANG Yu-bo2, SHAO Jin2, ZHANG Peng2, CHEN Yan-ning2, 3, ZHOU Min2, WANG Wen-he2, WANG Zheng2, HUANG Hai-chao2, WANG Li-cheng3, ZHONG Ming-chen3, ZHEN Yan2, WAN Yong2
1. Department of Chemical Engineering, Tsinghua University, Beijing 100084, China
2. National & Local Joint Engineering Research Center for Reliability Technology of Energy Internet Intelligent Terminal Core Chip，Beijing Smart-Chip Microelectronics Technology Co., Ltd., Beijing 100089, China
3. Beijing Chip Identification Technology Co., Ltd., Beijing 102200, China
Abstract：Nylons are widely used as engineering plastics. When used as packaging materials for power system chips, the aging of nylons in the natural environment may cause package failure, reliability deterioration of chips, or even chip failure, and finally, lead to great loss in the power industry. Therefore, aging evaluation of nylons has attracted great attention. Conventional aging evaluation methods include natural weathering and artificial accelerated aging. Both of these two methods are time-consuming. Furthermore, the effects of various environmental factors on aging of nylons can not be investigated. In this paper a novel in-situ aging evaluation method was proposed and the corresponding system was developed to study nylon 6 (PA6) and nylon 66 (PA66)’s aging stability. The system can combine environmental factors such as irradiation, temperature, humidity and oxygen. By measuring the generation of gaseous degradation products during aging process of nylons, the stability can be compared. The results show that the gaseous degradation products of PA6 and PA66 are mainly H2O and CO2, and CO2 is used as an indicator to evaluate the aging status. Nylons with different natural pre-aging times were detected. Longer pre-aging time responds to more generations of CO2, demonstrating poorer stability. Furthermore, this method was applied to study the effect of humidity on the aging of PA6 and PA66. It was proved that humidity accelerates nylon aging, and high temperature further promotes this acceleration effect. The novel in-situ aging evaluation method can evaluate aging stability of nylons under versatile environmental factors in only several hours. It is also expected to be a powerful and promising aging evaluation method for other polymer materials.
[1] Bernstein R, Gillen K T. Polymer Degradation and Stability, 2010, 95(9): 1471.
[2] JIA Yi-jun, BI Li, CHEN Guo-jun, et al(贾义军, 毕 立, 陈国军, 等). Engineering Plastics Application(工程塑料应用), 2020, 48(5): 34.
[3] El-Mazry C, Ben H M, Correc O, et al. Polymer Degradation and Stability, 2013, 98(1): 22.
[4] White G V, Smith J N, Clough R L, et al. Polymer Degradation and Stability, 2012, 97(8): 1396.
[5] Pagacz J, Leszczyńska A, Modesti M, et al. Thermochimica Acta, 2015, 612: 40.
[6] Octavie O D, Emmanuel R, Jacques V, et al. Polymer, 2016, 82: 49.
[7] Cannon C G. Spectrochim Acta，1960, 16(3): 302.
[8] Elsa S G, Poulsen L, Ogilby P R. Polymer Degradation and Stability, 2007, 92(11): 1977.
[9] Thanki P N, Singh R P. Polymer, 1998, 39(25): 6363.
[10] Roger A, Sallet D, Lemaire J. Macromolecules, 1986, 19(3): 579.
[11] AN Zhen-hua, YANG Rui(安振华, 杨 睿). Acta Polymerica Sinica(高分子学报), 2020, 52(2): 196.
[12] WU Jin-guang(吴瑾光). Modern Fourier Transform Infrared Spectroscopy Technology and Application(近代傅里叶变换红外光谱技术及应用). Beijing: Scientific and Technical Documentation Press(北京: 科学技术文献出版社), 1994. 621.
[13] Mikolajewski E, Swallow J E, Webb M W. J. Appl. Polym. Sci., 1964, 8(5): 2067.
[14] Pierre-Yves L G, Mael A, Maelenn L G, et al. Polymer Degradation and Stability, 2017, 137: 272.
[15] Behrouz A, Barend J T, Alessandro P, et al. Polymer Degradation and Stability, 2017, 146: 260.
[16] El-Mazry C, Correc O, Colin X. Polymer Degradation and Stability, 2012, 97(6): 1049.
[17] James E Pickett, Dennis J Coyle. Polymer Degradation and Stability, 2013, 98(7): 1311.
[18] Bernstein R, Derzon D K, Gillen K T. Polymer Degradation and Stability, 2005, 88(3): 480.
