Tensile deformation of polyamide (PA) 6 probed by rheo-optical near-infrared (NIR) spectroscopy |
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| Affiliation: | 1. Agri-Chemistry Group, School of Medical and Applied Sciences, Central Queensland University (CQU), Bruce Highway, North Rockhampton, Queensland, 4701, Australia;2. School of Science, RMIT University, GPO Box 2476, Melbourne, Victoria 3001, Australia;1. Department of Physics, SCE-Shamoon College of Engineering, Beer-Sheva, 84100, Israel;2. Department of Microbiology, Immunology and Genetics, Faculty of Health Sciences, Ben-Gurion University of the Negev, Beer-Sheva, 84105, Israel;3. Department of Electrical and Electronics Engineering, ACLP-Afeka Center for Language Processing, Afeka Tel-Aviv Academic College of Engineering, Israel;4. Department of Physics, Ben-Gurion University of the Negev, Beer-Sheva, 84105, Israel;1. Centre for Research in Earth and Space Science, York University, 4700 Keele St, Toronto, M3J 1P3, Ontario, Canada;2. Austrian Space Forum, Etrichgasse 18, 6020 Innsbruck, Austria;3. Unidad Asociada UVa-CSIC al Centro de Astrobiología, Parque Tecnológico de Boecillo, Valladolid, Spain;4. Departamento de Química, Universidad de La Laguna, Avenida Astrofísico Francisco Sánchez, s/n. 38200 La Laguna, Tenerife, Spain;5. Instituto Universitario de Materiales y Nanotecnología, Universidad de La Laguna, Avenida Astrofísico Francisco Sánchez, s/n. 38200 La Laguna, Tenerife, Spain;1. Laboratório de Química de Calixarenos, Espectroscopia Molecular e Catálise (LQCEMC), Instituto de Ciências Ambientais, Químicas e Farmacêuticas, Universidade Federal de São Paulo, Rua Prof. Arthur Riedel, 275, CEP 09972-270, Diadema, SP, Brazil;2. Laboratório de Espécies Químicas Altamente Reativas (LQBEAR), Instituto de Ciências Ambientais, Químicas e Farmacêuticas, Universidade Federal de São Paulo, Rua Prof. Arthur Riedel, 275, CEP 09972-270, Diadema, SP, Brazil |
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| Abstract: | A rheo-optical near-infrared (NIR) spectroscopy, based on the combination of NIR spectroscopy and mechanical analysis, was applied to polyamide (PA) 6 samples consisting of bundled amorphous chains. Sets of strain-dependent NIR spectra as well as tensile stress of dried and wet treated PA 6 samples were collected during the mechanical elongation of the samples. The spectra were then subjected to two-dimensional (2D) correlation analysis to elucidate fine features of the spectral changes. An asynchronous correlation peak develops between the bands at 2355 and 2300 nm due to the combination modes of  CH2 groups arising from the rubbery amorphous chain and rigid crystalline lamella of the dried PA 6, respectively. It therefore indicates that during the tensile deformation, the orientation of the amorphous chain is induced first to cause the elastic deformation. Further elongation results in the rotation of the crystalline lamella connected with the amorphous chain. This correlation intensity apparently increases by the wet treatment, suggesting that water molecule in the PA 6 disrupts the H-bonding interaction between the adjacent polymer chains and thus makes the polymer more flexible. Accordingly, it is likely the H-bonding between the polymer chains works in a manner somewhat similar to cross-linked polymers, which substantially effects on the mechanical property of the PA 6. |
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| Keywords: | Rheo-optical near-infrared (NIR) spectroscopy Two-dimensional (2D) correlation spectroscopy Polyamide (PA) 6 Tensile deformation |
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