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首页> 外文OA文献 >Langmuir-Blodgett mono- and multilayers of preformed poly(octadecyl methacrylate)s, 1. Surface-area isotherms of atactic and isotactic poly(octadecyl methacrylate)s and transfer into multilayers
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Langmuir-Blodgett mono- and multilayers of preformed poly(octadecyl methacrylate)s, 1. Surface-area isotherms of atactic and isotactic poly(octadecyl methacrylate)s and transfer into multilayers

机译：预制的聚甲基丙烯酸十八烷基酯的Langmuir-Blodgett单层和多层，1.无规和等规聚甲基丙烯酸十八烷基酯的表面积等温线，并转移到多层中

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摘要

In order to elucidate some of the parameters controlling the transfer of compressed monomolecular layers of preformed poly(octadecyl methacrylate)s (PODMA) onto substrates by the so-called Langmuir-Blodgett technique, an investigation was undertaken of PODMA's of different tacticity and different molecular weights. For the preparation of multilayered structures it was necessary to decrease the interaction between the side chains. This could be accomplished by introducing side chain inhomogeneities especially in the form of comonomers with shorter alkyl side chains. The transferability of a monolayer could be correlated with features in the pressure-area diagrams, as there is a liquid-analogous state formed when shorter alkyl chains are introduced; moreover a partial "melting" with lowering of the collaps pressure of the layer is seen. It appeared that with isotactic PODMA regular Y-type transfer took place, whereas with the atactic polymers at the beginning a Z-type transfer occurred, gradually changing into a Y-type transfer. Applying the concept of decreasing interaction of the side chains it was possible to prepare multilayers of isotactic and atactic PODMA's.
机译：为了阐明通过所谓的Langmuir-Blodgett技术控制预成型的聚甲基丙烯酸十八烷基酯（PODMA）的压缩单分子层到基材上的转移的某些参数，对不同立构规整度和不同分子的PODMA进行了研究。重量。为了制备多层结构，必须减少侧链之间的相互作用。这可以通过引入侧链不均匀性来实现，特别是以具有较短烷基侧链的共聚单体的形式。单层的可转移性可能与压力区域图中的特征相关，因为当引入较短的烷基链时会形成类似液体的状态。此外，可以看到层的塌陷压力降低的部分“熔化”。似乎在等规PODMA上发生了常规的Y型转移，而在无规立构聚合物开始时发生了Z型转移，并逐渐转变为Y型转移。应用减少侧链相互作用的概念，可以制备等规和无规PODMA的多层。

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