Journal
POLYMER
Volume 52, Issue 12, Pages 2576-2583Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.polymer.2011.04.021
Keywords
Block copolymers; Star polymers; Mechanical properties
Categories
Funding
- NSF [DMR 09-69301]
- CRP Consortium at Carnegie Mellon University
- Ministry of Education, Science and Technology [R33-10035-0]
- Division Of Materials Research
- Direct For Mathematical & Physical Scien [969301] Funding Source: National Science Foundation
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A series of well defined ABA, 3-arm star and bottle brush type copolymers, containing soft poly(n-butyl acrylate) (PBA) blocks and hard blocks of polystyrene (PS) were synthesized by atom transfer radical polymerization (ATRP). Small angle X-ray scattering was used to study the phase separation in these systems and dynamic mechanical analysis and tensile tests were performed to characterize their thermo-mechanical properties. The specific molecular architecture has a major effect on the copolymers self-organization and material properties. The linear ABA type copolymers showed micro phase separation and thermoplastic elastomer (TPE) behavior only at very high PS content. The change of molecular architecture from linear to 3-arm star type resulted in an improved phase separation at lower PS content and better thermoplastic elastomer properties. In contrast the specific brush type molecular architecture seems to prevent the micro phase separation of the PBA and PS components, resulting in amorphous bulk material with single glass transition temperature. (C) 2011 Elsevier Ltd. All rights reserved.
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