摘要：

Rational design of rubber materials with tailor-made properties needs further insights in the local characterization of these complex materials and the understanding of structure-property relationships.
Among some other experimental approaches, proton time-domain NMR spectroscopy has been successfully applied in rubber science and technology in order to characterize the degree of anisotropy of segmental motion (orientation correlations), which arises from constraints to the chain motion posed by chemical crosslinks and topological constraints such as entanglements1. As consequence this feasible and novel experimental approaches allow us to obtain very local information from the always difficult to analyze vulcanized rubber samples.
In this contribution we will review the most recent developments in i) the vulcanization topic2-3, pointing out the effect of cross-linking reactions on chain dynamics and network structure (including NR-latex3); ii) rubber reinforcement, by evaluating the filler-rubber interface in rubber (nano)composites4; iii) rubber ageing and iv) the dynamic rubber structure in ionic elastomers5.
Application of advanced NMR experiments (potentially applicable on inexpensive and easy to use low-field spectrometers) for the complete and quantitative analysis of elastomers has important advantages in basic science, but also it is also important in applied technology in the case of rubber compounds of special interest for the rubber industry6.

 

Refere
nces:[1] K. Saalwächter. Prog. Nucl. Magn. Reson. Spectrosc. 2007, 51, 1-35.
[2] J.L. Valentin, P. Posadas, A. Fernández-Torres, M.A. Malmierca, L. González, K. Saalwächter. Macromolecules, 2010, 43, 4210-4222.
[3] Justin Che, Shigeyuki Toki, Juan L. Valentin, Justo Brasero, Adun Nimpaiboon, Lixia Rong, Benjamin S. Hsiao. Macromolecules,  2012, 45, 6491-6503.
[4] J.L. Valentin, I. Mora-Barrantes, J. Carretero-González, M.A. López-Manchado, P.Sotta, D. R. Long, K. Saalwächter. Macromolecules, 2010, 43, 334-346.
[5] Mora-Barrantes, I.; Malmierca, M. A.; Valentin, J. L.; Rodriguez, A.; Ibarra, L., Soft Matter, 2012, 8, 5201-5213 ; M. A. Malmierca, A. González-Jiménez, I. Mora-Barrantes, P. Posadas, A. Rodríguez, L. Ibarra, A. Nogales, K. Saalwächter, J. L. Valentín. Macromolecules, submitted.
[6] I. Mora-Barrantes, A. Rodríguez, L. Ibarra, J.L. Valentin. J. Mater. Chem. 2011, 21, 7381-7392.
 

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个人简介：

Dr. Juan Lopez Valentinwas born in Madrid (Spain) in 1978. He Studied Chemistry at the Complutense University of Madrid (1996-2001), and got the PhD in Chemistry (2005) thanks to the work on “Rubber reinforcement by using modified sepiolite clay” in the Elastomers Group at the Institute of Polymer Science and Technology (CSIC). After 31 months post-doctoral stay at the Martin Luther University Halle Wittenberg (Germany) with Prof.Dr. K. Saalw?chter(thanks to Alexander von Humboldt fellowship) working on the application of advanced time-domain NMR experiments on rubber science, was reincorporated (2008) at the Elastomers Group in Madrid.Currently, he is Tenured Scientist (Ramon y Cajal Fellowship) in the Elastomers Group (since December 2010) at the Institute of Polymer Science and Technology (CSIC) in Madrid (Spain).
The main researching objective of Dr. J. L. Valentín and the Elastomers group is the design and development of new elastomeric materials for advanced applications.