Microwave systems for the processing of advanced ceramics

Wilson, Otto C.; Carmel, Y.; Lloyd, Isabel K.; Olorunyolemi, Tayo; Calame, J.P.; Gershon, D.; Pert, E.; Xu, G.; Walter, Michael J.; Jaworski, Artur J.; Birnboim, A.

doi:10.1109/plasma.1999.829394

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“…Although layered silicates are the most used nanofillers,5 – 7 recently attention has turned to layer double hydroxides (LDHs), also known as hydrotalcite-like compounds,8 – 17 with the general formula where M II is a divalent cation such as Mg, Ni, Zn, Cu or Co, M III is a trivalent cation such as Al, Cr, Fe or Ga and A n− is an anion of charge n . The possibility of replacing these anions by simple ion exchange procedures makes LDH a unique class of layered solids to be used as hosts of polymer bearing a negative charge or polymers copolymerised with a small quantity of a negatively charged monomer 11 , 14…”

Section: Introductionmentioning

confidence: 99%

Crystallisation of nanohybrids of poly(ϵ-caprolactone) and hydrotalcites containing antimicrobial species

Pucciariello

Villani

Giammarino

2012

Plastics, Rubber and Composites

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New composites of poly(e-caprolactone) containing Zn/Al hydrotalcites [layer double hydroxide (LDH)] and 'active' antimicrobial anions (benzoate, dichlorobenzoate, o-hydroxybenzoate and p-hydroxybenzoate) prepared with two different techniques have been characterised through differential scanning calorimetry and dynamic mechanical analysis. The method of preparation of the samples has a strong influence on the dispersion of the nanolayers within the polymeric matrix, and, in turn, on the crystallisation kinetics: in fact, the samples prepared by high energy ball milling crystallise much faster than those prepared by casting. The different 'active' anions strongly affect the value of the LDH interlamellar distance, which, in turn, affects their capacity of dispersion in the polymer. As a consequence of the different kinds of dispersion, the sample containing benzoate LDH or dichlorobenzoate LDH crystallises faster than that containing p-hydroxybenzoate LDH. Such results are of great importance in the definition of processing and use conditions of such materials of potential interest in food 'active' packaging.

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