SHEAR-DEPENDENT SLIPPAGE AT A POLYMER SOLID INTERFACE
SHEAR-DEPENDENT SLIPPAGE AT A POLYMER SOLID INTERFACE
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DOI：
10.1021/la00048a030
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发表时间：
1992-12-01
期刊：
影响因子：
3.9
通讯作者：
DEGENNES, PG
中科院分区：
文献类型：
--
作者：
BROCHARD, F;DEGENNES, PG
我们讨论了聚合物熔体在固体表面附近的剪切流动，在固体表面上接枝了一些链（化学上与熔体相同）。在低剪切速率sigma < sigma*时，我们预计会有很强的摩擦，在参考文献1.1中进行了分析。在一定的临界剪切sigma*以上，接枝链应该经历一个线圈拉伸转变。在拉伸状态下，它们不与熔体纠缠，当σ > σ *时，预计会出现明显的滑移。这种转变在聚合物的加工中可能是重要的，其中来自熔体的一些链可以结合在挤出机壁上并发挥接枝链的作用。
We discuss shear flows of a polymer melt near a solid surface onto which a few chains (chemically identical to the melt) have been grafted. At low shear rates sigma < sigma* we expect a strong friction, analyzed in ref 1.1 Above a certain critical shear sigma* the grafted chains should undergo a coil stretch transition. In the stretched state, they are not entangled with the melt, and a significant slippage is expected when sigma > sigma*. This transition may be important in the processing of polymers, where a few chains from the melt can be bound on an extruder wall and play the role of the grafted chains.