Altering surface fluctuations by blending tethered and untethered chains,Soft Matter

当前位置： X-MOL 学术 › Soft Matter › 论文详情

Our official English website, www.x-mol.net, welcomes your feedback! (Note: you will need to create a separate account there.)

Altering surface fluctuations by blending tethered and untethered chains
Soft Matter ( IF 3.4 ) Pub Date : 2017-10-16 00:00:00 , DOI: 10.1039/c7sm01616f
J. K. Lee _{1,

2,

3,

4} , B. Akgun _{5,

6,

7,

8,

9} , Z. Jiang _{4,

10,

11,

12} , S. Narayanan _{4,

10,

11,

12} , M. D. Foster _{1,

2,

3,

4}

Affiliation

“Partially tethering” a thin film of a polymer melt by covalently attaching to the substrate a fraction of the chains in an unentangled melt dramatically increases the relaxation time of the surface height fluctuations. This phenomenon is observed even when the film thickness, h, is 20 times the unperturbed chain radius, R_g,tethered, of the tethered chains, indicating that partial tethering is more influential than any physical attraction with the substrate. Furthermore, a partially tethered layer of a low average molecular weight of 5k showed much slower surface fluctuations than did a reference layer of pure untethered chains of much greater molecular weight (48k), so the partial tethering effect is stronger than the effects of entanglement and increase in glass transition temperature, T_g, with molecular weight. Partial tethering offers a means of tailoring these fluctuations which influence wetting, adhesion, and tribology of the surface.

更新日期：2017-11-15

点击分享查看原文

点击收藏

公开下载

阅读更多本刊最新论文本刊介绍/投稿指南

全部期刊列表>>