Component dynamics in nanostructured PI-PDMS diblock copolymers with PI segregated in lamellas, cylinders, and spheres
Component dynamics in nanostructured PI-PDMS diblock copolymers with PI segregated in lamellas, cylinders, and spheres
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纳米结构 PI-PDMS 二嵌段共聚物中的组分动力学，其中 PI 呈片状、圆柱状和球状分离
DOI：
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发表时间：
2014
影响因子：
2.4
通讯作者：
J. Colmenero
中科院分区：
文献类型：
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作者：
Á. Alegría;R. Lund;F. Barroso;A. Arbe;J. Colmenero
通过宽带介电谱研究了自组装二嵌段聚异戊二烯（PI）-聚二甲基硅氧烷（PDMS）共聚物的两种组分的动力学。通过改变 PDMS 块的尺寸，可以获得不同的 PI 偏析几何形状，即片状、圆柱状和球状，典型尺寸在 6-16 nm 范围内。通过这种方式，我们确定了纳米结构对聚合物组分介电弛豫的影响：PI 和 PDMS 嵌段的 α 弛豫以及 PI 嵌段的正常模式。探讨了两种不同的情况：（1）在 PI 相被冻结的温度范围内检测到 PDMS 动态；（2）在 PDMS 相高度移动的温度范围内检测到 PI 动态。因此，使用单个系统，研究了硬约束和软约束之间的异同。
The dynamics of the two components of self-assembled diblock polyisoprene (PI)-polydimethylsiloxane (PDMS) copolymers is investigated by means of broadband dielectric spectroscopy. By varying the size of the PDMS blocks, different PI segregation geometries are obtained, namely lamellas, cylinders, and spheres, with typical sizes in the range 6–16 nm. In this way, we identify the effects of the nanostructure on the dielectric relaxation of the polymer components: the α-relaxation of PI and PDMS blocks as well as the normal mode of PI blocks. Two different situations are explored: (1) the PDMS dynamics is detected in a temperature range where the PI phase is frozen and (2) the PI dynamics is detected in a temperature range where the PDMS phase is highly mobile. Thus, using a single system, the similarities and differences between hard and soft confinement are investigated.