| 查看: 801 | 回复: 9 | ||
| 【奖励】 本帖被评价8次，作者alanxia增加金币 6.4 个 | ||
[资源]
Study of pore morphology and anisotropic evolution of UHMWPE film
|
||
|
Abstract： Porous polyolefin films are commonly used as separators in the battery industry. The thermal response of this separator membrane is critical to battery performance, particularly with regard to battery safety. Two commercial separator films (Teklon and Asahi) were studied in this Thesis. The major component of these films is ultra high molecular weight polyethylene (UHMWPE). As the temperature of the films rises above the softening point, pores collapse and ion transport ceases leading to a current shutdown. Pore morphology evolution with temperature plays very important roles in the shutdown behavior. Ultra small angle scattering (USAXS) was used to characterize pore evolution in near the softening temperature. Pore anisotropy on different length scales was measured by anisotropic ultra small angle scattering (AUSAXS). SEM images were also reported that were consistent with the USAXS analysis. The study is divided into two sections: in situ conditioning and ex situ conditioning. The in situ study covers experiments on polyelectrolyte-saturated samples thermally conditioned in the x-ray instrument. The ex situ study focused on films conditioned external to the USAXS camera and studied at room temperature in the dry state. The ex-situ conditioned dry films were observed through USAXS and AUSAXS. The data were analyzed to extract Guinier radius, Porod constant, surface area, pore chord, and solid chord in the machine direction (MD) and transverse direction (TD). Pore anisotropy evolution was measured using AUSAXS. Anisotropy at three length scales was measured by performing azimuthal scans at three different scattering angles. The Hermans orientation factor was used to make quantitative comparisons between the Teklon and Asahi materials. The results show that Teklon samples have larger pores (pore chord in MD = 1550 Å, pore chord in TD = 1400 Å  that collapse abruptly when the temperature rises above the softening temperature while Asahi films have smaller pores (pore chord in MD = 650 Å, pore chord in TD = 570 Å that evolve more gradually with rising temperature. The AUSAXS data show that the pores of Teklon films are more anisotropic than Asahi films. Above the softening temperature, both Teklon and Asahi samples become isotropic. |
回复此楼» 本帖附件资源列表
-
欢迎监督和反馈：小木虫仅提供交流平台，不对该内容负责。
本内容由用户自主发布，如果其内容涉及到知识产权问题，其责任在于用户本人，如对版权有异议，请联系邮箱：xiaomuchong@tal.com - 附件 1 : 论文：Study of pore morphology and anisotropic evolution with thermal excursion of UHMWPE film -ZHENG DAZHI.pdf
2012-04-07 11:57:02, 4.37 M
» 猜你喜欢
基金申报
已经有5人回复
-
基金委咋了？2026年的指南还没有出来？
已经有7人回复
-
国自然申请面上模板最新2026版出了吗？
已经有17人回复
-
纳米粒子粒径的测量
已经有8人回复
-
疑惑？
已经有5人回复
-
计算机、0854电子信息（085401-058412）调剂
已经有5人回复
-
Materials Today Chemistry审稿周期
已经有5人回复
-
溴的反应液脱色
已经有7人回复
-
推荐一本书
已经有12人回复
-
常年博士招收(双一流，工科)
已经有4人回复
» 本主题相关价值贴推荐，对您同样有帮助:
- 能不能简单介绍一下 nomenclature of Domon and Costello
已经有4人回复
- 请投过Journal of Thermal Analysis and Calorimetry请进，咨询一下
已经有9人回复
- 投稿经验International Journal of Environmental Science and Technology
已经有6人回复
- Study of electronic and magnetic excitations in the 2D materials 石墨烯毕业论文
已经有80人回复
- Membrane Technology Lab Department of Chemical and Biochemical Engineering, XMU
已经有3人回复
- Journal of Pharmaceutical and Biomedical Analysis投稿求助
已经有9人回复
- 没有通过J of agriculture food and chemistry的初审
已经有25人回复
- 【求助】the French Ministry of Education and Research
已经有14人回复
简单回复
2012-04-07 17:33
回复
五星好评 顶一下，感谢分享！
2012-04-07 20:10
回复
五星好评 顶一下，感谢分享！
2012-04-07 20:25
回复
顶一下，感谢分享！
yangtlu5楼
2012-04-07 20:53
回复
五星好评 顶一下，感谢分享！
vodyhee6楼
2012-04-10 10:16
回复
五星好评 顶一下，感谢分享！
2012-04-14 16:48
回复
五星好评 顶一下，感谢分享！
qjq19498楼
2013-05-16 09:47
回复
五星好评 顶一下，感谢分享！
wx105029楼
2013-05-18 20:52
回复
五星好评 顶一下，感谢分享！
wangy090710楼
2016-06-16 22:28
回复
五星好评 顶一下，感谢分享！