Crystalline high polymers of α-olefins
WebThe highly crystalline fractions have very high melting points, e.g. more than 100°C higher than those of polymers of linear α-olefins having either the same molecular weight or … WebNatural fibre-polymer adhesion can be improved by treating the fibre surface or polymer. In this study, resorcinol-hexamethylenetetramine mixture (R-HMT) is used as a chemical treatment for kenaf… Expand 6 PDF Save Alert References SHOWING 1-3 OF 3 REFERENCES CRYSTALLINE HIGH POLYMERS OF α-OLEFINS G. Natta, P. Pino, …
Crystalline high polymers of α-olefins
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WebApr 28, 2024 · Research on the thermal and thermo-oxidative degradation of polyacetals allows for the development of effective methods of utilization of the waste of these … WebApr 25, 2012 · The highly threo-diisotactic polymer shows liquid crystalline properties, as analyzed by polarizing microscopy and differential scanning calorimetry (DSC), whereas atactic polymers do not...
WebJul 25, 2024 · Olefin-based block polymers are composed of semi-crystalline ‘hard’ segments with high melt (T m) or glass transition temperatures (T g) and amorphous ‘soft’ segments with low glass transition temperature. Promising elastic properties can be obtained if the microstructure of tri- or multi-block copolymer contains a sequence of two … WebJan 26, 2024 · Generally, the elasticity of these polyolefins mainly comes from the alternately crystallineamorphous block structures, which is closely related to the characteristic of the catalytic system. To improve performance of the catalysts and develop excellent polyolefin elastomers, research on the catalytic mechanism is of great …
WebFeb 7, 2007 · Isotactic polypropylene, crystallized from the melt, 51 is a semi-crystalline polymer with a crystallinity of about 60% and a melt temperature (or point) of about 165 o C. 51 The crystal modifi...
WebMar 18, 2005 · Both higher α‐olefins and cycloolefins can produce homopolymers and copolymers with lighter olefins, mostly with ethylene. Crystalline polymers of higher α‐olefins belong to two classes of stereoregular polymers, isotactic and syndiotactic.
WebFeb 19, 2024 · In the case of olefin polymerizations forming crystalline polymers, the difference between lamellar thickness of the polymer phase and pore size in the catalyst particle is also a key factor. Growth of thin polymer lamellae inside the nano-sized pores can cause further fragmentation of the sub-particles and exposure of more active sites. smart agrifood 2022WebMar 2, 2024 · Catalysts that can polymerize ethylene, α-olefins, or both, in a controlled living fashion, enable the synthesis of olefin block copolymers (OBCs). However, these … hill \u0026 wilkinson austinWebAug 15, 2024 · The catalyst can give linear α-olefin polymers with high and controllable molecular weights. Moreover, it makes the fabrication of polymers with specific tacticity … hill \u0026 usher insuranceWebJan 14, 2024 · Crystalline high polymers of α-olefins Natta, Giulio; Pino, Piero; Corradini, Paolo; Danusso, Ferdinando; Mantica, Enrico; Mazzanti, Giorgio; Moraglio, Giovanni … smart agriculture irrigation systemWebMar 18, 2005 · Abstract This article describes polymeric materials derived from higher olefins, α‐olefins with carbon atom numbers 4 and higher, and from cycloolefins. Both … smart ahorroWebMar 18, 2005 · Crystalline polymers of higher α-olefins belong to two classes of stereoregular polymers: isotactic and syndiotactic polymers. Isotactic polymers are … smart agtechWebCombined with organoborate, an N-heterocyclic carbene ligated scandium trialkyl complex catalyzed monomers to produce a series of syndiotactic sulfur-functionalized poly (α … smart agriculture using raspberry pi