Thermo-mechanical properties linked to rheological features in high molecular weight SEBS copolymers: Effect of styrene content and ethylene/butylene proportion

被引：18

作者：

Arevalillo, Alfonso ^{[1
,2
]}

Eugenia Munoz, Maria ^{[1
,2
]}

Calafell, Itxaso ^{[1
,2
]}

Santamaria, Anton ^{[1
,2
]}

Fraga, Luisa ^{[3
]}

Antonio Barrio, Juan ^{[3
]}

机构：

[1] Univ Basque Country UPV EHU, Fac Chem, Polymer Sci & Technol Dept, San Sebastian 20080, Spain

[2] Univ Basque Country UPV EHU, Fac Chem, POLYMAT, San Sebastian 20080, Spain

[3] Repsol NV, Ctr Technol, Madrid 28931, Spain

来源：

POLYMER TESTING | 2012年 / 31卷 / 07期

关键词：

Block copolymers; Rheology; Relaxation; Thermal properties; Entanglement; BLOCK-COPOLYMERS; DISORDER TRANSITION; TRIBLOCK COPOLYMER; EXTRUSION; BEHAVIOR; ORDER; RELAXATION; BLENDS;

D O I：

10.1016/j.polymertesting.2012.06.007

中图分类号：

TB3 [工程材料学];

学科分类号：

0805 ; 080502 ;

摘要：

Novel results on the thermomechanical and rheological properties of poly (Styrene-b-Ethylene-co-Butylene-b-Styrene) (SEBS) copolymers of molecular weight close to Mw = 200,000 g/mol, with varying styrene content and ethylene/butylene proportion, are presented. DSC and DMTA tests reveal that only the sample which contains more ethylene than butylene in PEB midblock chains is able to crystallize. Small amplitude oscillatory flow measurements show evidence of PEB entanglements, although the chains are anchored to PS cylinder domains. Increasing butylene proportion in PEB leads to a decrease of the entanglement density. Entanglements and microphase segregation bring about a very elastic behaviour which produces "plug-flow", leading to smooth extrudates, in extrusion flow experiments. (c) 2012 Elsevier Ltd. All rights reserved.

引用

页码：849 / 854

页数：6

共 37 条

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