【摘 要】
：
The crystallinity of ethylene-butene copolymers prepared by copolymerization of ethylene and butene in the presence of a new highly active catalyst was studied
【机 构】
：
Institute of Polymer Science
论文部分内容阅读
The crystallinity of ethylene-butene copolymers prepared by copolymerization of ethylene and butene in the presence of a new highly active catalyst was studied by means of DSC, WAXD and DMA. The results show that the melting temperature, the crystallinity and the crystallite size decreased with increasing the content of butene in the copolymers. The copolymers have a high degree of branching, the butene segments are mainly in the amorphous regions of the copolymers, while the polyethylene sequence forms crystal phase acting as crosslinking bondage between the molecules at room temperature. The ethylene-butene copolymers have a low modulus, a low stress and a high strain analogous to the stress-strain behavior of non-cross thermoplastic elastomer.
其他文献
Changes of composition and structure of various samples of polymethylsilsesquioxane (PMSQ) pyrolysed at different temperature under flowing nitrogen were invest
Based on the stochastic inclined rods model proposed by H. Matsuura et al., we study the motion of actin myosin system in an overdamped regime. Our model is com
Eight of new 5-oxo-[1]benzopyrano[2,3-b]pyridines as the analogues of tetracycline, were designed and synthesized, and their affinity to the hydroxyapatite - th
The reactions of [PPh4][(η5-C5Me5)WS3] with four equiv of CuBr in DMF gave rise to a new cluster salt [Cu(DMF)6][(η5-C5Me5)WS3(CuBr)3]2·Et2O 1. The crystal s
Total and differential cross sections for K+-6Li elastic scattering are calculated using the folding optical potential model, in which the influence of three fa
Six alkylene-linked dimers of (-)-huperzineA (6) were prepared. All these dimers are less potent than (-)-Hup A in inhibition of AChE.
This paper investigates the possibility of attaining sulphonated poly(phenylene oxide) (SPPO) with a relatively higher sulfonation degree. To achieve this aim,
The mononuclear copper(I) complex, [Cu(dppe)2](PF6)(CH3COCH3) [dppe = bis-(diphenylphosphino)ethane] has been synthesized and characterized by X-ray crystallogr
This paper is concerned with the oscillation of second order linear functional equations of the form x(g(t)) = P(t)x(t) + Q(t)x(g2(t)), where P, Q,g: [t0, ∞)
π-Conjugated poly(p-phenyleneethynylene) with the interruption of the conjugation by a butylene unit was synthesized. Its absorption, PL and EL spectra were in