首页> 外文期刊>The Journal of Chemical Physics >ORDER-DISORDER TRANSITION AND ORDERING KINETICS IN BINARY DIBLOCK COPOLYMER MIXTURES OF STYRENE AND ISOPRENE
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ORDER-DISORDER TRANSITION AND ORDERING KINETICS IN BINARY DIBLOCK COPOLYMER MIXTURES OF STYRENE AND ISOPRENE

机译:苯乙烯和异戊二元二元嵌段共聚物混合物的有序-无序转变和有序动力学

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The order-disorder transition (ODT) and the ordering kinetics have been studied in two symmetric diblock copolymers of styrene and isoprene and their binary mixtures with theology. The binary mixtures formed a single microdomain (with lamellar morphology) composed of short and long chains as confirmed by small angle x-ray scattering (SAXS). The order-disorder transition temperature (T-ODT), obtained from the discontinuity in the storage modulus G', varies linearly with the number average degree of polymerization. For shallow quenches, the ordering kinetics proceed via nucleation and growth. The characteristic time of this process scales with (N) over bar(-1/3), where (N) over bar is the Ginzburg parameter, in agreement with the theoretical predictions [G. H. Fredrickson and K. Binder, J. Chem. Phys. 91, 7265 (1989)]. Our results indicate that the ordering kinetics of symmetric diblock copolymers near the ODT are fluctuation controlled. (C) 1996 American Institute of Physics. [References: 20]
机译:在苯乙烯和异戊二烯的两种对称二嵌段共聚物及其二元混合物的神学研究中,研究了有序-无序转变(ODT)和有序动力学。二元混合物形成了由短链和长链组成的单个微区(具有层状形态),这已通过小角度X射线散射(SAXS)进行了确认。由储能模量G′的不连续性获得的有序-无序转变温度(T-ODT)随数均聚合度线性变化。对于浅淬火,有序动力学通过成核和生长进行。该过程的特征时间与(N)超过bar(-1/3)成比例,其中bar之上的(N)是Ginzburg参数,与理论预测一致[G. H.Fredrickson和K.Binder,化学杂志。物理91,7265(1989)]。我们的结果表明,ODT附近对称二嵌段共聚物的有序动力学受到波动控制。 (C)1996年美国物理研究所。 [参考:20]

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