nanocomposite vulcunizates based on styrene-butadiene rubber (sbr), organoclay and a conventional sulfur curing system were prepared by melt blending process in an internal mixer. in order to study the effects of the type of interfacial compatibilizer on the properties of sbr and clay nanoparticles,three types of compatibilizers, maleic anhydride grafted ethylene-propylene diene rubber (epdm-g-...

Kompleks ortamlarda asphalt kaplamaların performansını garanti etmek için styrene- butadiene- styrene (SBS), butadiene rubber (SBR), crumb (CR), and polyphosphoric acid (PPA) gibi bazı malzemeler bitüm modifikasyonunda kullanılmıştır. Modifikasyon yöntemleri sırasında, geleneksel asfalt bağlayıcıyı geliştirmek veya desteklemek alternatif katkılar Modifiye üretilmesinde en çok kullanılan polimer...

It is a highly desirable but difficult task to predict the molecular fluorescence quantum efficiency from first principles. The molecule in the excited state can undergo spontaneous radiation, conversion of electronic energy to nuclear motion, or chemical reaction. For relatively large molecules, it is impossible to obtain the full potential energy surfaces for the ground state and the excited ...

Butadiene-styrene copolymer (SBR) is an elastomer composed of 75% butadiene and 25% styrene widely used in the automotive industry tire production. This can be produced from two polymerization processes: emulsion or solution polymerization. paper presents mechanical behavior a polymer reinforced sand compared to pure sand. Direct shear tests were performed on specimens with addition modified bu...

The asymmetric unit of the title compound, C(10)H(20)I(2)Si(2), contains two half-mol-ecules. Both complete molecules are generated by crystallographic inversion centers located at the mid-points of the central C-C single bonds; the butadiene groups are planar, with a trans conformation about the central C-C bond. The mol-ecules show short intra-molecular H⋯I contacts of 2.89 and 2.92 Å. The cr...

The mol-ecule of the title compound, C(18)H(18)O(2), a symmetrically phenol-substituted divinyl analog, exhibits crystallographically imposed C(2) symmetry. The phenolic and divinyl planar groups inter-sect each other orthogonally, with a dihedral angle of 82.7 (1)°. The structure is stabilized by a short intra-molecular C-H⋯O contact. The mol-ecules are held together by C-H⋯π inter-actions, fo...

A multi-step synthesis of the title compound has been devised. In spite of its P=C double bond, the compound does not react at 100 °C with methanol and 2,3-dimethyl-1,3-butadiene. DFT calculations indicate a planar core, a long P=C double bond at 1.725 Å and a high-lying LUMO. Complexation can force the methoxy substituent to rotate out of the plane, thus restoring partly the double bond charac...

Intracules in position space, momentum space and phase space have been calculated for low-lying excited states of the He atom, Be atom, formaldehyde and butadiene. The phase-space intracules (Wigner intracules) provide significantly more information than the position- and momentum-space intracules, particularly for the Be atom. Exchange effects are investigated through the differences between c...