Polymer-grafted platelets (PGPLs) were prepared via atom transfer radical polymerization of butyl methacrylate with the initiator bonded to the surface of hematite platelets, and the conformation of the poly(butyl methacrylate) (PBMA) chains grafted onto the top and bottom of the platelets at a dimensionless graft density (σ*) of 0.3–0.9 was studied. PGPLs were shaped into films with platelets parallel to the film surface via dispersion casting followed by hot pressing. The face-to-face distance between platelets increases with the number-average molecular weight of the grafted polymer and equals 2L_cσ*, where L_c is the contour length of the grafted PBMA chains. This suggests that the polymer chains grafted onto a platelet are stretched perpendicular to the platelet face to a similar extent as those grafted onto flat substrates, and their ends are opposed to those grafted from the opposite platelets to fill the space between the platelets.

中文翻译：

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密集接枝到板状颗粒上的聚合物的链构象


通过甲基丙烯酸丁酯的原子转移自由基聚合制备聚合物接枝片 （PGPLs），引发剂键合到赤铁矿片片表面，并研究了以 0.3-0.9 的无量纲接枝密度 （σ*） 接枝到片状片顶部和底部的聚甲基丙烯酸丁酯 （PBMA） 链的构象。通过分散铸造将 PGPLs 塑造成薄膜，使片状物平行于薄膜表面，然后进行热压。血小板之间的面对面距离随着接枝聚合物的数均分子量的增加而增加，等于 2L_cσ*，其中 L_c 是接枝 PBMA 链的轮廓长度。这表明接枝到血小板上的聚合物链垂直于血小板表面拉伸，其程度与接枝到平坦基材上的聚合物链相似，并且它们的末端与从相反的血小板接枝以填充血小板之间的空间的末端相反。