Slip at polymer–polymer interfaces: Rheological measurements on coextruded multilayers
Slip at polymer–polymer interfaces: Rheological measurements on coextruded multilayers
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DOI：
10.1122/1.1427912
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发表时间：
2002-01
影响因子：
3.3
通讯作者：
Rui Zhao;C. Macosko
中科院分区：
文献类型：
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作者：
Rui Zhao;C. Macosko
粘度非常匹配的聚丙烯 (PP) 和聚苯乙烯 (PS) 被共挤出成 8、32 和 64 层交替层。使用在线狭缝流变仪和平行板流变仪测量这些多层样品的表观稳定剪切粘度。在这两种情况下，表观粘度随着层数的增加而降低，为界面滑移提供了有力的证据。根据表观粘度测量计算界面上的速度差（界面滑移速度）与剪切应力 ΔVI(τ)。 ΔVI(τ) 显示 S 形行为：滑移非常低的区域 ( 103 Pa，随后是线性区域 ΔVI=τ/β∞。这些数据可以与修改后的埃利斯模型拟合。相同的函数适合不同层数以及狭缝和平行板数据，表明 ΔVI(τ) 是 PP/PS 对的材料属性。在 PS/PMMA（聚甲基丙烯酸甲酯）中也观察到滑移 甲基丙烯酸酯）和 PP/aPA（非晶尼龙）p...
Polypropylene (PP) and polystyrene (PS), with closely matched viscosity, were coextruded into 8, 32, and 64 alternating layers. The apparent steady shear viscosity of these multilayer samples was measured with an in-line slit rheometer and with a parallel-plate rheometer. In both cases the apparent viscosity decreased with the number of layers providing strong evidence for interfacial slip. The velocity difference across the interface (interfacial slip velocity) versus shear stress, ΔVI(τ) was calculated from the apparent viscosity measurements. ΔVI(τ) showed sigmoidal behavior: a region of very low slip ( 103 Pa followed by a linear region ΔVI=τ/β∞. These data could be fit with a modified Ellis model. The same function fit the different number of layers and both slit and parallel-plate data indicating ΔVI(τ) is a material property of the PP/PS pair. Slip was also observed in PS/PMMA (polymethyl methacrylate) and PP/aPA (amorphous nylon) p...