Interaction between finite-sized particles and end grafted polymers
Interaction between finite-sized particles and end grafted polymers
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DOI：
10.1021/ma946439r
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发表时间：
1996-05
期刊：
影响因子：
5.5
通讯作者：
G. Subramanian;David R M Williams;P. Pincus
中科院分区：
文献类型：
--
作者：
G. Subramanian;David R M Williams;P. Pincus
我们描述了聚合物刷和蘑菇被有限尺寸的颗粒压缩的情况下，链固定或移动的接枝表面的变形行为。当颗粒的尺寸与链的接枝距离相比较大时，对于固定链和表面移动的链，颗粒上的力在压缩中相同至最低阶。单个蘑菇的压缩可以导致一级逃逸转变，其中部分链从颗粒下方逃逸。这些转变可以在链半径或压缩力定律行为中看到。对于表面移动的蘑菇，由于链从颗粒下排空，力小得多。在这种情况下，力定律在一定的压缩下也表现出最大值，表明该系统在临界压力或屈服应力Pc <$kTσ 0 RF 3 -1以上经历了崩溃转变，其中σ0是接枝密度（链/面积），RF 3是未扰动的。
We describe the deformation behavior of polymer brushes and mushrooms compressed by finite-sized particles for the cases where the chains are fixed or mobile on the grafting surface. When the size of the particle is large compared to the grafting distance of the chains, the force on the particle is the same to lowest order in compression for both the fixed and surface mobile chains. Compression of a single mushroom can lead to a first order like escape transition, where part of the chain escapes from under the particle. These transitions can be seen either in the chain radius or in the compressional force law behavior. For surface mobile mushrooms, the force is considerably smaller because of the evacuation of chains from under the particle. The force law in this case also exhibits a maximum at a certain compression, indicating that the system undergoes a collapse transition above a critical pressure or yield stress Pc ≈ kTσ0RF3-1, where σ0 is the grafting density (chains/area) and RF3 is the unperturbed ...