Detail of "24979-97-3"

Reference

Dynamics of polymer molecules at small scattering angles

Dynamics of polymer molecules at small scattering angles. Higgins, J. S.; Roots, J. E. (Dep. Chem. Eng., Imp. Coll., London, UK). Polym. Prepr. (Am. Chem. Soc., Div. Polym. Chem.), 24(2), 241-2 (English) 1983. CODEN: ACPPAY. ISSN: 0032-3934. DOCUMENT TYPE: Journal CA Section: 36 (Physical Properties of Synthetic High Polymers) Neutron scattering expts. by polystyrene [9003-53-6], polytetrahydrofuran [24979-97-3], and di-Me siloxanes in dil. soln. and melt were conducted at various Q values (Q = wavevector change on scattering). At Q < 1/Rg (Rg = ratio of gyration) the center of mass motion of the chain dominates. At 1/Rg < Q < 1/a (a = length corresponding to a no. of monomer units) the internal wriggling motion of the chain dominates. 12586-31-1 and 24979-97-3 which are cas registry numbers of substances are two of reagents here. At Q > 1/a local bond rotation dominates and a brownian defusion model of the local fluctuations leads to a Q2 dependence of the energy transfer and the correlation time. Scattering data for dil. solns. of the three polymers in two solvents at three different temps. was normalized by temp., solvent viscosity, and able to produce a universal curve. .

Transformation of cationic polymerization of tetrahydrofuran into anionic block copolymerization of vinyl monomers

Transformation of cationic polymerization of tetrahydrofuran into anionic block copolymerization of vinyl monomers. Zeng, Xiansen; Zhang, Hongzhi; Feng, Xinde (Dep. Chem., Peking Univ., Beijing, Peop. 24979-97-3 and 111-19-3 are cas registry numbers. These chemicals are also mentioned in this article. Rep. China). Gaofenzi Tongxun, (5), 375-80 (Chinese) 1983. CODEN: KFTTAR. ISSN: 0453-2880. DOCUMENT TYPE: Journal CA Section: 39 (Synthetic Elastomers and Natural Rubber) THF was polymd. in the presence of sebacoyl chloride [111-19-3] and AgClO4 at low temp., terminated with primary amines, treated with Na naphthalene, and used to initiate the copolymn. of Me methacrylate, styrene, and acrylonitrile. A thermoplastic elastomeric Me methacrylate-THF block copolymer [83840-68-0] was prepd. which had tensile strength 157 kg/cm2 and elongation ~700°. .