The Solid-phase Polymerisation of Monomers with Conjugated Acetylenic Groups

Abstract

The variation of the resistivity with thickness d and bulk electron mean free path Aof thin metal films with unlike surfaces is calculated using Soffer's angularly dependent surface scattering model. Tabular values for the resistivity enhancement due to a range of surface roughness combinations are presented. It is shown that in the limit of one very smooth and one very rough surface, the effect, as expected, is simply an apparent doubling in the sample thickness. This contrasts with the much more likely situation of one relatively rough surface and one smooth surface. For this case it is shown that at high K values ( K = diA,) the dependence of the resistivity on K varies approximately as the rougher surface limit, while at low Kvalues the variation approaches the limit of a sample of double thickness having, on both surfaces, the higher roughness. The overall effect in this case is that the resistivity appears to vary in the manner expected from an intermediate value of surface roughness with a changed p& value, p , being the bulk resistivity. It is demonstrated that only in the limit of identical surfaces, or one very smooth and one very rough surface, with in either case no, or at least known and quantifiable, grain boundary scattering, will the determination of p d , values be meaningful. Consequently p A values determined in the past from the measurement of the variation with thickness of the resistivity of thin films are often substantially in error. t Present address:

Polymers of Phenyldiacetylenes – Functional Thermostable Additions to Industrial Resins

“…Anionic homo-and copolymerization of DPD and DEB were performed in polar solvents in the presence of n-BuLi [14][15][16][17][18][19]. All synthesized polyconjugated polymers were yellow or brown powders, well-soluble in organic solvents.…”

“…Synthesis of homopolymers of DPD [14,15], DEB [16,17] and their random copolymers [18,19] under mild conditions (anionic initiators, temperature below 333 К) allowed obtaining for systematical studies the polymers characterized by:…”

“…• Addition of poly-PA practically did not increase thermooxidation stability of solidified TGM-3 (exp. [16][17][18].…”

Synthesis of homo‐ and copolymers of para‐diethynylbenzene in the presence of the cobalt carbonyl ‐ diphenylbutadiyne complex

“…Polymers of substituting mono‐and diacetylene monomers have unique properties that distinguish them from other polymers, such as high electrical conductivity and mobility of current carriers, catalytic activity, photoelectric sensitivity, thermo‐ and solvatochromic properties [1–5] . Diethynylbenzene (DEB) homopolymers and copolymers have additional properties that distinguish them from this class of polymers.…”

A Spectrophotometric Study of Solid-Phase Topochemical Polymerization of Diyne Arylcarbamates and Logistic Representation of Results

“…The best studied, in this regard, monomer is bis( p-tolyl) hexa-2,4-diyne-1,6-diol sulfonate [9], for which an induction period and an autocatalytic stage have been observed in UV-and radiation-initiated STP. In the first case (UV irradiation), the rate of TPS markedly decreases as the conversion becomes higher, which can be attributed to transfer of the energy of the excited state of the monomer to the polymer chain [10].…”