Component dynamics in nanostructured PI-PDMS diblock copolymers with PI segregated in lamellas, cylinders, and spheres

被引：16

作者：

Alegria, Angel ^{[1
,2
]}

Lund, Reidar ^{[1
,2
]}

Barroso-Bujans, Fabienne ^{[1
,2
]}

Arbe, Arantxa ^{[1
,2
]}

Colmenero, Juan ^{[1
,2
]}

机构：

[1] Univ Basque Country, Polymers & Soft Matter Grp, Ctr Fis Mat, CSIC,UPV,EHU, Donostia San Sebastian 20018, Spain

[2] Univ Basque Country, Dept Fis Mat, UPV, EHU, Donostia San Sebastian 20018, Spain

来源：

COLLOID AND POLYMER SCIENCE | 2014年 / 292卷 / 08期

关键词：

Dielectric relaxation; Block copolymers; Polymer dynamics; Nanostructure; Confinement effects; BLOCK-COPOLYMER; MICROPHASE SEPARATION; SEGMENTAL DYNAMICS; RELAXATION; ORDER; POLY(DIMETHYLSILOXANE); TRANSITION; POLYMERS; DISORDER;

D O I：

10.1007/s00396-014-3255-3

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

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 alpha-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.

引用

页码：1863 / 1876

页数：14

共 35 条

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