Abstract
We report on the deformation behavior of commercially relevant lamellar and cylindrical tri-block copolymers poly (styrene-b-ethylene-co-butylene-b-styrene) (SEBS) with two different compositions. The structural changes that occur at various length scales have been studied using a simultaneous small- and wide-angle X-ray scattering (SAXS/WAXS) during uni-axial tensile deformation of the polygrain samples. SAXS provides information about changes that occur upon deforming the glassy cylindrical or lamellar PS domains. WAXS, on the other hand, is sensitive to the crystallographic structure of the rubbery mid-block. Deformation calorimetry has been used to determine the energetics involved. The combined results from the various techniques indicate that the deformation takes place in three stages. First, at small strains, dilation occurs in the rubbery phase. At intermediate strains, the hard lamellar or cylindrical domains undergo micro-buckling, which is associated with a downturn in the stress–strain curve. Finally, we interpret that at higher strains, the bent lamellar/cylindrical domains rotate in the stretching direction resulting in a significant shear on the rubbery mid-block. This in turn leads to strain-induced crystallization in these materials. Although we could not prove it by WAXS, deformation calorimetry (which is more sensitive than the WAXS) was utilized to show its presence.
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References
Holden G, Legge NR, Quirk R, Schroeder HE (1996) Thermoplastic elastomers, 2nd edn. Hanser Publishers, Cincinnati
Honeker CC, Thomas EL (1996) Chem Mater 8:1702
Honeker CC, Thomas EL (2000) Macromolecules 33:9407
Honeker CC, Thomas EL, Albalak RJ, Hajduk DA, Gruner SM, Capel MC (2000) Macromolecules 33:9395
Yamaoka I, Kimura M (1993) Polymer 34:4399
Odell JA, Keller A (1977) Polym Eng Sci 17(8):544
Sakamoto J, Sakurai S, Doi K, Nomura S (1993) Polymer 34:4837
Seguela R, Prud´ homme J (1981) Macromolecules 14:197
Sakurai S, Momii T, Taie K, Shibayama M, Nomura S (1993) Macromolecules 26:485
Sakurai S, Kawada H, Hashimoto T (1993) Macromolecules 26:5796
Sakurai S, Sakamoto J, Shibayama M, Nomura S (1993) Macromolecules 26:3351
Pakula T, Saijo K, Kawai H, Hashimoto T (1985) Macromolecules 18:1294
Cohen Y, Albalak RJ, Dair BJ, Capel MS, Thomas EL (2000) Macromolecules 33:6502
Cohen Y, Brinkmann M, Thomas EL (2001) J Chem Phys 114(2):984
Keller A, Odell JA (1985) In: Folkes MJ (ed) Processing structure and properties of block copolymers. Elsevier Applied Science Publishers, p 29
Stribeck N, Buzdugan E, Ghioca P, Serban S, Gehrke R (2002) Macromol Chem Phys 203:636
Murthy NS, Grubb DT (2006) J Polym Sci [B] 44:1277
Tarasov SG, Tsvankin DY, Godovskii Yu K (1978) The structural changes during the deformation of orientated and isotropic butadiene-styrene block copolymers. Vysokomolekulyarnye Soedineniya Seriya A 20(7):1534
Read DJ, Duckett RA, Sweeney J, McLeish TCB (1999) J Phys D Appl Phys 32:2087
Sierra CA, Galan C, Fatou JG, Parellada MD, Barrio JA (1997) Polymer 38(17):4325
Indukuri KK, Lesser AJ (2005) Polymer 46:7218
Indukuri KK (2005) Polymer science and engineering. University of Massachusetts Amherst, Amherst
Lyon RE, Rabolin PJ (1995) J Therm Anal Calorim 44(4):777
Lyon RE, Rabolin PJ, (1984) Polymer science and engineering, University of Massachusetts Amherst, Amherst
Lyon RE, Farris RJ (1984) Polym Sci Eng 25:908
Lyon RE, Wang DX, Farris RJ, MacKnight WJ (1984) J Appl Polym Sci 29(9):2857
Shibayama M, Hashimoto T, Kawai H (1983) Macromolecules 16:16
Acknowledgement
The authors thank Center for University of Massachusetts and Industry Research on Polymers (CUMIRP) Cluster-M and Kraton Polymers U. S. LLC for their support and the National Science Foundation Materials Research Science and Engineering Center for their financial support.
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Mamodia, M., Indukuri, K., Atkins, E.T. et al. Hierarchical description of deformation in block copolymer TPEs. J Mater Sci 43, 7035–7046 (2008). https://doi.org/10.1007/s10853-008-3030-2
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DOI: https://doi.org/10.1007/s10853-008-3030-2