排序方式: 共有2条查询结果,搜索用时 0 毫秒
1
1.
Sunatda Arayachukiat Monchai Siriprumpoonthum Shogo Nobukawa Masayuki Yamaguchi 《应用聚合物科学杂志》2014,131(11)
Rheological properties and flow instability at capillary extrusion of a random terpolymer composed of vinyl butyral, vinyl alcohol, and vinyl acetate, that is denoted as PVB in this article, are studied. It is found that the rubbery plateau modulus is 1.3 MPa at 100°C from the oscillatory shear modulus. Furthermore, the average molecular weight between entanglement couplings Me is found to be 2670. Because of the relatively high value of , it shows rubbery region in the wide temperature range (90°C–180°C). At the capillary extrusion, the surface instability (shark‐skin failure) appears prior to volumetric melt fracture. The onset stress of the shark‐skin failure, ca. 0.18 MPa, is similar to that of polyethylene, although PVB used in this study has narrow molecular weight distribution. Moreover, the apparent slippage is not detected, presumably due to good adhesion to the die wall. © 2014 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2014 , 131, 40337. 相似文献
2.
Sunatda Arayachukiat Vu Anh Doan Tatsuya Murakami Shogo Nobukawa Masayuki Yamaguchi 《应用聚合物科学杂志》2015,132(22)
The self‐healing behavior of poly(vinyl butyral) (PVB) is evaluated below the glass transition temperature Tg. It is found that PVB shows autonomic self‐healing even at room temperature, although Tg is around at 76°C. Furthermore, a large amount of water is found to be adsorbed on the surface of the film. This is attributed to the surface localization of hydroxyl group in PVB, which is confirmed by X‐ray photoelectron spectroscopy. Since the surface is plasticized by water, the scar applied by a razor blade is healed even in the glassy state of the bulk. Moreover, the healing efficiency is enhanced at high humidity condition, owing to the pronounced plasticizing effect by water. © 2015 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2015 , 132, 42008. 相似文献
1