异质Stackelberg寡头竞争下创新产品技术许可策略研究

基于异质产品Stackelberg寡头竞争模型,建立了拥有新产品创新技术在位厂商与潜在竞争对手间的技术许可博弈模型.模型中假设潜在竞争对手可以接受许可,也可通过自我研发创新技术进入市场参与竞争.根据潜在竞争对手研发成本的高低,研究了创新厂商的最优两部制收费策略.研究结果表明:潜在竞争者总会接受创新技术许可,最优许可策略依赖于研发成本、市场参数以及产品的替代系数.     

Penetration of plasma surface modification. II. CF4 and C2F4 low-temperature cascade arc torch

The depth of surface modification by low-temperature cascade arc torch is investigated. A stack of 10 sheets of nonwoven fabrics of polyester fibers is exposed to a low-temperature cascade arc torch containing CF₄ or C₂F₄, and the fluorination effect is examined by ESCA. It is shown that interaction of chemically reactive species, created in a low-temperature cascade arc torch, with the surface is not limited to the surface contacted by the torch (flame). The results indicate that the fluorination effect is observed on surfaces which are shadowed from the torch by overlying fibers. The highest degree of fluorination is found on the second layer, rather than on the first layer which the torch contacts directly. No significant differences in the trends of penetration of CF₄ and C₂F₄ treatment through porous samples are observed. However, ESCA data show principal differences in chemical structures of the surfaces treated with CF₄ (nonpolymer-forming gas) and C₂F₄ (polymer-forming gas). These results indicate that chemically reactive species induced by the excited species of argon rather than primary species created by the ionization process seem to play predominant roles in the surface treatment as well as the low-temperature cascade arc torch polymerization of perfluorinated compounds. © 1994 John Wiley & Sons, Inc.     

Polymerization of allene and its derivatives under the influence of bis-π-allylnickelbromide

A study was made of the i.r. spectra of products of the interaction of bis-π-allylnickelbromide with allene and 1.1-dimethylallene. π-Allyl structure is retained in the catalytic complex. The basic features of allene and 1,1-dimethylallene polymerization under the influence of (π-C₃H₅NiBr)₂ were established. Reactivity of monomer in the polymerization decreases when passing from allene to dimethylallene and tetramethylallene. The structures of polyallene, polydimethylallene and polycyclonoadiene were determined from i.r.-spectroscopic data.     

New Preparation Methodology of Functionalized Picolines

Under the organomagnesium complex n‐Bu₂CH₃MgLi conditions, picoline compounds provide a new entry to a broad range of polyfunctional picoline derivatives, after reaction with various electrophiles.     

The structure of copolymers of vinyl cyclohexane with styrene

Copolymerization of vinyl cyclohexane (monomer-1) with styrene was investigated in the presence of the stereospecific complex catalyst TiCl₃ + Al(iso-C₄H₉)₃. Monomer reactivity ratios were r₁ = 0·177 ± 0·051 and r₂ = 2·117 ± 0·370. The monomer unit distributions in the copolymers were estimated by comparison of the i.r.-spectra of copolymers and the isotactic homopolymers using absorption bands at 565 and 1084 cm^?1 which correspond to the vibrations of styrene blocks containing ? 5 styrene units and the band at 985 cm^?1 characterizing polystyrene crystallinity. The data indicate the tendency towards alternation in the copolymerization. Analysis of the experimental and literature data led to the conclusion that distribution of the units in copolymers of vinyl cyclohexane with α-olefins is determined by the nature of the α-olefin. The following activity series is proposed for α-olefins in their copolymerization with vinyl cyclohexane in the presence of catalytic systems based on titanium salts and organo-aluminium compounds: propylene >; 4-methylpentene-1 >; styrene >; 3-methylbutene-1 ～ vinyl cyclohexane.     

新疆圆柏挥发油化学成分分析

气相色谱-质谱联用技术分析研究了植物新疆圆柏枝叶挥发油化学成分,分离鉴定了20个成分,占挥发油色谱总峰面积99.12%。     

单组分桥联茂基二异丙胺基钕配合物催化甲基丙烯酸甲酯聚合

催化聚合;茂稀土胺化物;单组分桥联茂基二异丙胺基钕配合物催化甲基丙烯酸甲酯聚合     

VISCOELASTICITY AND IONIC CONDUCTIVITY OF TWO-COMPONENT EPOXY NETWORK CONTAINING LITHIUM PERCHLORATE*

Polymeric solid electrolyte system composed of triglycidyl ether of glycerol (TGEG), diglycidyl ether of polyethylene glycol (DGEPEG)and LiClO_4 salt were synthesized. In this" system the electrolyte has a pecularity that not merely can the LiClO_4 provide ionic carriers, but also catalyze the crosslinking reaction without adding an usual curing agent. The effect of salt content and degree of crosslinking on the viscoelasticity and ionic conductivity were studied. Both WLF and VTF equations were used to treat the experimental data in order to elucidate the mechanism of ionic conduction. It was found that the ionic conductivity of the system is carded out through the segmental motion mechanism. However, the data must be treated with care. For example, in evaluating WLF parameters, the contribution concerned with ionic carrier generation with temperature to the conductivity must be differentiated from that concerned with segmental motion. Besides, the temperature range suitable to WLF equation must also be considered. For VTF equation, it might be inapplicable ff the temperature is too low and close to the glass transition temperature of the specimen. Further study is needed in order to have a quantitative information on the limitation of these equations.     

新型含嘧啶的苯氧乙酸酯类衍生物的合成

以对羟基苯甲醛和一氯乙酸为起始原料,经羟醛缩合、关环及酯化等反应合成了6个含有嘧啶杂环的新型苯氧乙酸酯类衍生物,其结构经¹H NMR, ¹³C NMR, IR和HR-ESI-MS表征。     

含联芴烯单元共轭聚合物的合成及表征

以六羰基钨[W(CO)₆]为催化剂, 合成了聚吲哚芴(P1)、 聚梯型四苯(P2)、 聚梯型五苯(P3)和小分子9-联吲哚芴烯(S1).该类聚合物的重复单元含有联芴烯结构, 通过芴9位的双键连接. 光学和电化学等实验结果表明, 聚合物无荧光发射, 是一类窄带隙的共轭聚合物, 其中聚合物P1薄膜的紫外吸收值最大波长为710 nm.