POLYMERIZATION OF OCTAFLUOROCYCLOBUTANE IN GLOW DISCHARGE Ⅱ. ESCA AND IR CHARACTERIZATION OF POLYMER STRUCTURE*

In a capacitively coupled discharge with external electrodes, He, H_2, N_2 or Ar were used as plasmagas, polymerization of octafluorocyclobutane was carried out under different conditions by varyingdischarge power, pressure, plasma gas and plasma-gas/monomer ratio. Structure of polymerizedproducts was characterized by IR spectroscopy and ESCA measurement. It was found that therewere six elements in the products, i.e. C, F, Si, O, N and H. The probably existed groups in poly-mers wer investigated. By analyzing the resolved peaks of C_(1S) region in ESCA spectra, effect of thereaction conditions on degree of branching of the polymerized products and the relationship of thepolymer structure wth the mechanism of the competitive ablation and polymerization process werestudied. In addition, polymer deposition process occurring in glow discharge was discussed.     

GRAFT COPOLYMERIZATION OF ACRYLAMIDE ONTO POLYPROPYLENE FILMS BY PLASMA TECHNIQUE

The graft copolymerization of acrylamide onto polypropylene (PP) Film was carried out by using a capacitively coupled rf plasma apparatus with external plate electrodes. The relationship between the surface structure of the Ar plasma-treated PP films and the extent of grafting of acrylamide on the films was studied through observing the effects of discharge power and exposure time on the relative content of free-radical on the film surface. Meanwhile, the wettability and surface energy of the PP film were measured.     

乙烯和丙烯的等离子体聚合及聚合物结构的研究

<正> 文献[1—3]曾报导过应用等离子体聚合方法制备有机聚合物薄膜,为掌握等离子体聚合物的性能,进而扩展其用途,对其结构进行研究具有一定的意义。Kobayashi等研究了用内部电极等离子体装置制备的聚乙烯的结构,并指出其为交联结构,他们用同样装置研究了单体流量对丙烯聚合膜淀积速率的影响。我们用较简单的外部电容耦合式聚合装置,研究了在辉光区中乙烯和丙烯的聚合规律,并应用元素分析、红外光谱和X射线衍射法研究了聚合物的结构。     

在辉光放电中八氟环丁烷聚合的研究

提出了用元素电负性计算碳氟聚合物C_IS结合能位移的半经验式。     

乙烯在N_2中的等离子体聚合

一、引言应用等离子体聚合方法以制备有机聚合物薄膜,在一些综合报道中已有所评介。一般说来,在等离子体中所形成的聚合物薄膜是高度交联和不溶的,而且在化学上也是极其惰性和稳定的。在辉光放电中使用清洗好的基片,通常可获得粘附于基片上性能优异的薄膜。 Yasuda等研究在等离子体中聚合物的淀积分布和某些有机化合物的等离子体聚合反应时,曾报道     

STRUCTURE OF PLASMA-POLYMERIZED OCTAFLUOROCYCLOBUTANE

Plasma-polymerization of octafluorocyclobutane was carried out in a capacitively coupled tubu-lar reactor with external electrodes. The number-average molecular weight, melting temperature,decomposition temperature and solubility in te trafluorodibromoethane of the products was mea-sured and the polymer structure was characterized by ESR. IR and ~(1)9F-NMR methods. The experi-mental results show the absence of the highly crosslinked structure but a fluorine-deficient structurecaused by free-radicals, carbonyl groups. double bonds and multicage-like segments in the polymer.     

PLASMA POLYMERIZATION OF HEXAMETHYLCYCLOTRISILOXANE

In a capacitively coupled RF discharge system with external electrodes ,hexamethyicyclotrisiloxane was polymerized, and the effects of discharge power and plasma gas on polymer deposition rate were studied. The polymer structures and properties were studied by IR spectroscopy, XPS measurement, PGC/MS combined technique, TG analysis and contact angle measuring. The results showed that the polymers prepared in H_2 or O_2 have higher C/Si ratio in comparison with those prepared in inert gases. PGC/MS results revealed the existence of many short carbon chains in the polymer structure .TG analysis suggested that the polymers prepared in the inert gas would possess better thermal stabilities.     

A STUDY OF THE POLYMERIZATION MECHANISM OF ACETONITRILE IN GLOW DISCHARGE

Plasma polymerization of acetonitrile was carried out by a capacitively coupled RF plasma apparatus with external electrodes under some different reaction conditions such as discharge power. By investigating the informations provided by the polymer deposition regularities, IR spectra and elementary analysis results, the polymerization mechanism of acetonitrile in glow discharge have been investigated. The results show that acetonitrile polymerized in glow discharge mainly through hydrogen detachment for initiation at lower energy levels and the role that opening C≡N triple bond played in polymerization became more important at higher energy levels.     

八氟环丁烷等离子体聚合物结构的ESCA和IR表征

采用外部电极电容耦合的等离子体聚合装置,以Ar、N_2H_2和Hc为等离子气体,在不同功率、压力、等离子气体及等离子气体对单体比率的反应条件下,在辉光放电中进行八氟环丁烷聚合。用电子能谱(ESCA)和红外光谱(IR)法对聚合物结构进行表征。发现聚合物中存在C、F、Si、O、N和H等六种元素,并对可能存在的基团进行探讨。通过对ESCA(C_18 谱的分析,研究了聚合物支化与交联程度对反应条件的依赖关系,及其和聚合与刻蚀竞争历程之间存在的内在联系。