Morphological similarity of a tri-block copolymer processed at ambient and elevated temperatures

İnceoğlu, Şebnem and Aytun, Taner and Menceloğlu, Yusuf Z. and Özen, İlhan and Acar, Metin H. (2012) Morphological similarity of a tri-block copolymer processed at ambient and elevated temperatures. Korea-Australia Rheology Journal, 24 (4). pp. 313-321. ISSN 1226-119X (Print) 2093-7660 (Online)

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We investigated the effect of temperature on the morphology of a tri-block copolymer (BCP) processed in a capillary rheometer. The material used was a polystyrene-b-poly(2-ethylhexyl acrylate)-b-polystyrene (PS-b-PEHA-b-PS) tri-block copolymer, which was synthesized by ATRP with a molecular weight of 38.5 K consisting of 49 molar % PEHA. According to the rheological data obtained with dynamic viscoelastic oscillatory measurements, order-disorder temperature (ODT) of the BCP was measured at around 110A degrees C. Considering this observation, the samples were studied under different temperatures and pressures (from 110A degrees C to 28A degrees C and from 48 to 75 bar) in capillary rheometer. All processed materials were characterized by using differential scanning calorimetry (DSC) and atomic force microscopy (AFM). It was found that all samples processed by aid of either temperature or pressure showed similar mixed morphologies (a mixture of the ordered and disordered structures i.e., the reduction of microphase separation due to processing).
Item Type: Article
Uncontrolled Keywords: order-disorder temperature; rheology; morphology; tri-block copolymer
Subjects: T Technology > TA Engineering (General). Civil engineering (General) > TA401-492 Materials of engineering and construction. Mechanics of materials
Divisions: Faculty of Engineering and Natural Sciences > Academic programs > Materials Science & Eng.
Faculty of Engineering and Natural Sciences
Depositing User: Yusuf Z. Menceloğlu
Date Deposited: 03 Jul 2013 15:12
Last Modified: 01 Aug 2019 10:38

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