权益分类	功能权益	普通用户	{{item.name}}会员
{{category.name}}	{{benefitItem.name}}

Studies on the Preparation of Polymeric Monolayer Thin Films by Vapor Deposition Polymerization

气相沉积聚合制备聚合物单层薄膜的研究

基本信息

批准号：
03453115
负责人：
OKUI Norimasa
金额：
$ 3.84万
依托单位：
Tokyo Institute of Technology
依托单位国家：
日本
项目类别：
Grant-in-Aid for General Scientific Research (B)
财政年份：
1991
资助国家：
日本
起止时间：
1991 至 1992
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/en/grant/KAKENHI-PROJECT-03453115/
关键词：
Vapor Deposition Polymerizaton Thin Film Normal Orientation Poly(amic acid)Polyimide

项目摘要

Vapor deposition polymerization (VDP) is one of the most useful methods for producing high performance polymer thin films. This method also gives molecular orientation in the polymer film. For example, we have reported that nylon1010, alkyl-aromatic polyamide and polyamide films with molecular chain perpendicular to the substrates can be formed on the substrates. We have proposed that the formation of highly oriented polymer thin films by VDP is associated with alternating reaction-deposition process, which is similar to the molecular layer epitaxy for a GaAs thin film. In this study, the film formation process during alternating VDP was studied by a quartz film thickness monitor. Moreover, the dipole orientation of an odd-nylon (nylon 79) was measured by analyzing the second harmonic generation (SHG) in the thin films prepared by VDP in the presence of an electric field during the deposition.The change in the thickness during the alternating deposition suggests that the mechanism involves adsorption and descrption behavior indicating two types of adsorption, i.e., chemisorption and physisorption. This result suggests that the alternating VDP can produce a polyamide thin film with a layered structure like an LB film.The SH intensity profiles confirmed that the dipoles in the molecular chains aligned preferentially parallel to the electric field applied during the VDP process.These results lead to the conclusion that the two monomers can be deposited alternately to form a layer-by-layer structure with a molecular orientation perpendicular to the substrate. In addition, the electric field applied during the deposition can give rise to the spontaneous polarization in the film, where the dipoles align parallel to he applied electric field.

气相沉积聚合（VDP）是制备高性能聚合物薄膜的最有效方法之一。该方法还在聚合物膜中提供分子取向。例如，我们已经报道了尼龙1010、烷基-芳香族聚酰胺和分子链垂直于基底的聚酰胺膜可以在基底上形成。我们已经提出，形成高度取向的聚合物薄膜的VDP是与交替反应沉积过程，这是类似的GaAs薄膜的分子层外延。在这项研究中，薄膜形成过程中，交流VDP研究了石英膜厚监测。此外，通过分析在沉积过程中存在电场的情况下由VDP制备的薄膜中的二次谐波产生（SHG），测量了奇数尼龙（尼龙79）的偶极取向。在交替沉积期间厚度的变化表明，该机制涉及吸附和描述行为，表明两种类型的吸附，即，化学吸附和物理吸附。这一结果表明，交替VDP可以制备出类似LB膜的层状结构的聚酰胺薄膜，SH强度分布证实了分子链中的偶极子在VDP过程中优先平行于施加的电场排列，这些结果导致了两种单体可以交替沉积形成逐层的结论。具有垂直于衬底的分子取向的层结构。此外，在沉积期间施加的电场可以引起膜中的自发极化，其中偶极子平行于所施加的电场排列。