caa a22 4500 465814441 CHVBK 20180323112123.0 cr unu---uuuuu 170327e19900301xx s 000 0 eng 10.1007/BF01332378 doi (NATIONALLICENCE)springer-10.1007/BF01332378 Molecular interpretation of the behaviour of polyisobutylene in different solvents [Elektronische Daten] [T. Moussa, K. Tam, C. Tiu] The effects of solvent environment on the behaviour of a high molecular weight polyisobutylene dissolved in kerosene and various grades of poly-1-butene solvent mixtures are investigated. The dependence of various molecular parameters such as zero-shear viscosity, intrinsic viscosity, specific viscosity, relaxation time and molecular expansion factor, on the polymer concentration, type of solvent and solvent viscosity is studied in the vicinity of dilute and semidilute regions (near the critical concentrationc *). The dependence of these parameters on solvent environment follows qualitatively Zimm's molecular model. The dependence on the polymer concentration deviates from this dilute solution theory. The effects of temperature on the zero-shear viscosity and the Maxwell relaxation time are also presented for two PIB solutions. Steinkopff, 1990 S olvent effects nationallicence p olyisobutylene nationallicence m olecular parameters nationallicence Z imm's theory nationallicence c ritical c oncentration nationallicence a : radius of bead nationallicence c : polymer concentration nationallicence c * : critical polymer concentration nationallicence f : friction coefficient of polymer chain nationallicence G′ : storage modulus nationallicence K : constant in the theoretical intrinsic viscosity relationship (Eq. (5)) nationallicence K′ : constant in Eq. (6) nationallicence M w : molecular weight nationallicence M n : number average molecular weight nationallicence M 0 : monomer molecular weight nationallicence n : number of polymer molecules per cm3 nationallicence N : number of beads nationallicence N 0 : Avogadro's number nationallicence p : degree of polymerization nationallicence R : universal gas constant nationallicence 〈 r 2〉 θ 1/2 : root-mean-square end-to-end distance of polymer molecules nationallicence 〈 r 2〉1/2 : root-mean-square end-to-end distance of unperturbed polymer molecules (θ-condition) nationallicence T : temperature nationallicence x i : mass fraction nationallicence α : molecular expansion factor nationallicence η : steady-shear viscosity nationallicence subscripti refers to componenti nationallicence η 0 : zero-shear viscosity nationallicence η p : (η 0 −η s) polymer's contribution to zero-shear viscosity nationallicence η s : solvent viscosity nationallicence η sp : specific viscosity nationallicence [ η ]0 : zero-shear intrinsic viscosity nationallicence λ : Maxwell relaxation time nationallicence λ z : Zimm's relaxation time nationallicence ω : frequency nationallicence Moussa T. Dept. of Chemical Engrg., Monash University, 3168, Clayton, Victoria, Australia aut Tam K. Dept. of Chemical Engrg., Monash University, 3168, Clayton, Victoria, Australia aut Tiu C. Dept. of Chemical Engrg., Monash University, 3168, Clayton, Victoria, Australia aut Rheologica Acta Steinkopff-Verlag 29/2(1990-03-01), 117-126 0035-4511 29:2<117 1990 29 397 https://doi.org/10.1007/BF01332378 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/BF01332378 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Moussa T. Dept. of Chemical Engrg., Monash University, 3168, Clayton, Victoria, Australia aut NATIONALLICENCE 700 1- Tam K. Dept. of Chemical Engrg., Monash University, 3168, Clayton, Victoria, Australia aut NATIONALLICENCE 700 1- Tiu C. Dept. of Chemical Engrg., Monash University, 3168, Clayton, Victoria, Australia aut NATIONALLICENCE 773 0- Rheologica Acta Steinkopff-Verlag 29/2(1990-03-01), 117-126 0035-4511 29:2<117 1990 29 397 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer