Component Dynamics in Miscible Blends of 1,4-Polyisoprene and 1,2-Polybutadiene

@article{citeulike:2712057, abstract = {The effects of blending on the rheology of the individual components in highly entangled miscible blends of 1,4-polyisoprene (PI) and 1,Zpolybutadiene (1,2-PB) are investigated. Blend component contributions to the dynamic modulus, G*(o), are recovered over the full composition range by complementing dynamic mechanical rheometry with infrared polarimetry. Distinct relaxations for each component are observed. Analysis of the modulus amplitudes of the component G*(w) contributions reveals that the behavior of the slower relaxing component, 1,2-PB, compares well with constraint release scaling predictions. Each component is found to have a different average number of skeletal bonds between entanglements, in agreement with the predictions of an existing entanglement theory. The components appear to adopt a single reptation tube diameter and a mutual modulus shift factor, bT(Z'), in each blend. Analysis of the frequency dependence of the component G*(w) contributions indicates that each component's relaxation is governed by a distinct apparent glass transition temperature, Tg,an d that at a constant T - Tgb lend composition only mildly influences the component relaxation times. A mild increase in the 1,2-PB relaxation time in the blend suggests a possible increase in the 1,2-PB friction factor in the presence of PI.}, author = {Zawada, Jeffrey A. and Fuller, Gerald G. and Colby, Ralph H. and Fetters, Lewis J. and Roovers, Jacques }, citeulike-article-id = {2712057}, doi = {10.1021/ma00101a026}, journal = {Macromolecules}, keywords = {blend, polybutadiene, polyisoprene, rheology}, number = {23}, pages = {6861--6870}, posted-at = {2008-04-24 08:46:11}, priority = {2}, title = {Component Dynamics in Miscible Blends of 1,4-Polyisoprene and 1,2-Polybutadiene}, url = {http://dx.doi.org/10.1021/ma00101a026}, volume = {27}, year = {1994} }

TY - JOUR ID - citeulike:2712057 L3 - citeulike-article-id:2712057 TI - Component Dynamics in Miscible Blends of 1,4-Polyisoprene and 1,2-Polybutadiene JF - Macromolecules VL - 27 IS - 23 SP - 6861 EP - 6870 N2 - The effects of blending on the rheology of the individual components in highly entangled miscible blends of 1,4-polyisoprene (PI) and 1,Zpolybutadiene (1,2-PB) are investigated. Blend component contributions to the dynamic modulus, G*(o), are recovered over the full composition range by complementing dynamic mechanical rheometry with infrared polarimetry. Distinct relaxations for each component are observed. Analysis of the modulus amplitudes of the component G*(w) contributions reveals that the behavior of the slower relaxing component, 1,2-PB, compares well with constraint release scaling predictions. Each component is found to have a different average number of skeletal bonds between entanglements, in agreement with the predictions of an existing entanglement theory. The components appear to adopt a single reptation tube diameter and a mutual modulus shift factor, bT(Z'), in each blend. Analysis of the frequency dependence of the component G*(w) contributions indicates that each component's relaxation is governed by a distinct apparent glass transition temperature, Tg,an d that at a constant T - Tgb lend composition only mildly influences the component relaxation times. A mild increase in the 1,2-PB relaxation time in the blend suggests a possible increase in the 1,2-PB friction factor in the presence of PI. KW - blend KW - polybutadiene KW - polyisoprene KW - rheology AU - Zawada, Jeffrey AU - Fuller, Gerald AU - Colby, Ralph AU - Fetters, Lewis AU - Roovers, Jacques PY - 1994/// UR - http://dx.doi.org/10.1021/ma00101a026 ER -