RELAXATION IN DOMAINS：STRUCTURE AND SEGMENTAL DYNAMICS OF LC／I DIBLOCK COPOLYMERS

• Published in: Chinese journal of polymer science Vol. 21; no. 2; pp. 153 - 158
• Main Author: B.Stuhn S.Joukov R.Staneva R.Ivanova W.Gronski S.Geppert B.Stuhn
• Format: Journal Article
• Language: English
• Published: Ilmenau Technical University, Techn. Physik Ⅱ, D-98693 Ilmenau, Germany%Universitat Freiburg, Inst. f. Makromolekulare Chemie, D-79104 Freiburg, Germany 01.03.2003
• Subjects: 共聚物; 小角X射线散射; 聚合物链; 聚苯乙烯; Confinement; LC/I block copolymers; Segmental dynamics; Dielectric relaxation
• ISSN: 0256-7679; 1439-6203
• DOI: 10.3321/j.issn:0256-7679.2003.02.009

A series of block copolymers consisting of an isotropic(polystyrene) block and a side-chain liquid crystalling block(LC) have been studied using small-angle X-ray scattering and dielectric spectroscopy.The triblock copolymer (PSLC-PS) displays an order-to-order transition (OOT) together with the isotropic/nematic transition of the LC phase.The series of diblock copolymers show no clear OOT but the phase diagram differs from that of non-LC block copolymers.The segmental dynamics as measured with dielectric spectroscopy is dominated by the α and δ relaxation of the LC block.Both display a WLF like temperature dependence.The relaxation times are influenced by the constraints of the nanoscale domains.They are decreased for the LC confined in the domain as compared to the LC in the continuous matrix.