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 MSA  Vol.8 No.5 , May 2017
Spin-Spin Relaxation Time to Evaluate Degradation of HIPS/Organoclaynano Composites by Aging
Abstract: NMR relaxometry is one of the techniques that allow observing changes in the molecular mobility that come from materials’ morphology. T1H has been used to monitor food and polymer sciences. However, T2>H, although being a revealing as T1>H, is rarely used to analyze changes in thermoplastic systems it is more sensitive to the mobile region. High Impact Polystyrene nanomaterials were prepared through solution casting and were exposed for different times to UV light in the air. The samples, removed after each exposure interval, were characterized by T2>H, focusing on the changes in the relaxation data. The results for this parameter showed that the changes in the relaxation data come from the competition of chain scission and chain recombination processes, which occurs due to the UV light influence with increased time. The T2>H data indicated that the clay ratio can influence the chain degradation processes, acting to inhibit or accelerate the aging process [1] [2].
Cite this paper: da Silva, P. , Iulianelli, G. and Tavares, M. (2017) Spin-Spin Relaxation Time to Evaluate Degradation of HIPS/Organoclaynano Composites by Aging. Materials Sciences and Applications, 8, 342-350. doi: 10.4236/msa.2017.85023.
References

[1]   Santos, F.A. and Tavares, M.I.B. (2014) Development and Characterization of Hybrid Materials Based on Biodegradable PLA Matrix, Microcrystalline Cellulose and Organophilic Silica. Polímeros, 24, 561-566.
https://doi.org/10.1590/0104-1428.1653

[2]   Santos, F.A. and Tavares, M.I.B. (2013) Preraring Films from Poly(Lactid Acid) and Microcrystalline Cellulose and Characterization. Polímeros, 23, 229-235.

[3]   Kumar, V. and Singh, A. (2013) Polypropylene Clay Nanocomposites. Reviews in Chemical Engineering, 29, 439-448.
https://doi.org/10.1515/revce-2013-0014

[4]   Bayram, I.G.J., Oral, A. and Kamil, F. (2013) Synthesis of Poly(Cyclohexene Oxide)-Montmorillonite Nanocomposite via in Situ Photoinitiated Cationic Polymerization with Bifunctional Clay. Journal of Chemistry, 2013, Article ID: 617498.
https://doi.org/10.1155/2013/617498

[5]   ASTM E2456-06 (2012) Standard Terminology Relating to Nanotechnology. ASTM International, West Conshohocken, PA.
www.astm.org

[6]   Silva, P.S.R.C. and Tavares, M.I.B. (2013) Intercalacao por Solucao de Poliestireno de Alto Impacto em Montmorilonita Organofílica—Obtencao e Caracterizacao. Polímeros Ciência e Tecnologia, 23, 644-648.
https://doi.org/10.4322/polimeros.2013.047

[7]   Kusmono, Wildan, M.W. and Mohd Ishak, Z.A. (2013) Preparation and Properties of Clay-Reinforced Epoxy Nanocomposites. International Journal of Polymer Science, 2013, Article ID: 690675.

[8]   Huskic, M., Zigon, M. and Ivankovic, M. (2013) Comparison of the Properties of Clay Polymer Nanocomposites Prepared by Montmorillonite Modified by Silane and by Quaternary Ammonium Salts. Applied Clay Science, 85, 109-115.

[9]   Delbem, M.F., Valera, T.S., Valenzuela-Diaz, F.R. and Demarquette, N.R. (2010) Modification of a Brazilian Smectite Clay with Different Quaternary Ammonium Salts. Quimica Nova, 33, 309-315.

[10]   Rasmussen, K., Grampp, G., Eesbeek, M.V. and Rohr, T. (2010) Thermal and UV Degradation of Polymer Films Studied in Situ with ESR Spectroscopy. ACS Applied Materials & Interfaces, 2, 1879-1883.
https://doi.org/10.1021/am100219z

[11]   Yang, Y., Hu, C., Zhong, H., Chen, X., Chen, R. and Yam, K.L. (2016) Effects of Ultraviolet (UV) on Degradation of Irgafos 168 and Migration of Its Degradation Products from Polypropylene Films. Journal of Agricultural and Food Chemistry, 64, 7866-7873.
https://doi.org/10.1021/acs.jafc.6b03018

[12]   Remili, Y.G.C., Kaci, M., Kachbi, S. and Bruzaud, S. (2009) Photo-Oxiadation of Polystyrene/Clay Nanocomposites under Accelerated UV Exposure: Effect on the Structure and Molecular Weight. Journal of Applied Polymer Science, 112, 2868-2875.
https://doi.org/10.1002/app.29806

[13]   Bovey, F.A. and Mirau, P.A. (1996) NMR of Polymers. Academic Press, Cambridge, MA.

[14]   Komoroski, R.A. (1986) High Resolution NMR Spectroscopy of Synthetic Polymers in Bulk. VCH Publishers, Weinheim.

[15]   McBrierty, V.J. and Packer, K.J. (2006) Nuclear Magnetic Resonance in Solid Polymers. Cambridge University Press, Cambridge.

[16]   Levitt, M.H., Grant, D.M. and Harris, R.K. (2002) Encyclopedia of Magnetic Resonance. John Wiley and Sons, Hoboken.

[17]   Monteiro, M.S.S.B., Neto, R.P.C., Santos, I.C.S., Silva, E.O. and Tavares, M.I.B. (2012) Inorganic-Organic Hybrids Based on Poly(ε-Caprolactone) and Silica Oxide and Characterization by Relaxometry Applying Low-Field NMR. Materials Research, 15, 825-832.

[18]   VanderHart, D.L., Asano, A. and Gilman, J.W. (2001) Solid-State NMR Investigation of Paramagnetic Nylon-6 Clay Nanocomposites. 1. Crystallinity, Morphology, and the Direct Influence of Fe3+ on Nuclear Spins. Chemistry of Materials, 13, 3781-3795.
https://doi.org/10.1021/cm0110775

[19]   Xu, B., Leisen, J. and Beckham, H.W. (2014) Nanoparticle Dispersion in Polymer Nanocomposites by Spin-Diffusion-Averaged Paramagnetic Enhanced NMR Relaxometry. Nanoscale, 6, 1318-1322.
https://doi.org/10.1039/C3NR04570F

[20]   Almeida, A.S., Tavares, M.I.B., Silva, E.O., Neto, R.P.C. and Moreira, L.A. (2012) Development of Hybrid Nanocomposites Based on PLLA and Low-Field NMR Characterization. Polymer Testing, 31, 267-275.

[21]   Reich, H.J. (2017) 8.1 Relaxation in NMR Spectroscopy. Chem.wisc.edu.
https://www.chem.wisc.edu/areas/reich/nmr/08-tech-01-relax.htm

[22]   Vilaplana, F., et al. (2011) NMR Relaxation Reveals Modifications in Rubber Phase Dynamics during Long-Term Degradation of High-Impact Polystyrene (HIPS). Polymer, 52, 1410-1416.

[23]   Numata, K., Kurokawa, H., Kawaguchi, S., Sekine, S., Nakazawa, Y. and Asano, A. (2016) Evaluation of Sealability for Aged Rubber Seals by Spin-Spin Relaxation Time. Polymer Testing, 49, 147-155.

[24]   Kulagina, T.P., Karnaukh, G.E. and Smirnov, L.P. (2015) Characterization of Structure and Self-Diffusion of Elastomers by NMR Method. Acta Physica Polonica A, 127, 1128-1132.
https://doi.org/10.12693/APhysPolA.127.1128

[25]   Silva, P.S.R.C. and Tavares, M.I.B. (2015) Solvent Effect on the Morphology of Lamellar Nanocomposites Based on HIPS. Materials Research, 18, 191-195.
https://doi.org/10.1590/1516-1439.307314

 
 
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