Fluctuation dynamics of block copolymer vesicles
Fluctuation dynamics of block copolymer vesicles
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DOI：
10.1103/physrevlett.94.016105
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发表时间：
2005-01-14
影响因子：
8.6
通讯作者：
Mochrie, SGJ
中科院分区：
文献类型：
--
作者：
Falus, P;Borthwick, MA;Mochrie, SGJ
X射线光子相关光谱被用来表征的波矢量和温度依赖的动力学的自发热波动在囊泡（L-4）相，发生在一个对称的聚（苯乙烯-乙烯/丁烯-苯乙烯）三嵌段共聚物与聚苯乙烯均聚物的共混物。中间散射函数的测量揭示了拉伸指数行为与时间的关系，拉伸指数略大于2/3。相应的弛豫速率与波矢近似相关。总的来说，实验测量很好地描述了理论，治疗独立的膜菌斑的动力学。
X-ray photon correlation spectroscopy was used to characterize the wave-vector- and temperature-dependent dynamics of spontaneous thermal fluctuations in a vesicle (L-4) phase that occurs in a blend of a symmetric poly(styrene-ethylene/butylene-styrene) triblock copolymer with a polystyrene homopolymer. Measurements of the intermediate scattering function reveal stretched-exponential behavior versus time, with a stretching exponent slightly larger than 2/3. The corresponding relaxation rates show an approximate q(3) dependence versus wave vector. Overall, the experimental measurements are well described by theories that treat the dynamics of independent membrane plaquettes.