Catalytic Reaction by Hydrotalcites - (I): Polymerization of Methyl Methacrylate

Al-Esaimi, M. M.

doi:10.1080/00914030008034870

Cited by 1 publication

(1 citation statement)

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“…Layered double hydroxides or anionic clays having formula [M II ð1ÀxÞ M III x (OH) 2 ] yþ [A n-] y=n .mH 2 O, where M II is Mg 2þ , Ca 2þ , M III is Al 3þ , and A represents the anions like Cl -and CO 2À 3 , have permanent positive charges and significant anion exchange capacities [5][6]. They have wide-ranging potential applications as catalyst and catalyst supports [7][8][9][10], antacids and antipepsin agents [11], adsorbents [12][13][14], fillers [15], filtration and exchange material, and in drug and gene delivery systems [16]. The hydrotalcites have also been used in various other applications such as stabilizers for resins or rubbers, e.g., polyethylene, polypropylene, and chlorine-containing resins as well as paints, agriculture films, inks, and deodorants [17,18].…”

Section: Introductionmentioning

confidence: 99%

Role of Hydrotalcites Cations in Thermal Stabilization of Poly (Vinyl Chloride)

Gupta

Agarwal

Banerjee

2012

International Journal of Polymeric Materials

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The present paper describes the effect of cation, present in a basic cationic building layer and anion in interlayers on the thermal stabilizing properties of hydrotalcites. Hydrotalcites having Cl À and CO 2À 3 in their anionic layer, having basic cationic layers Mg and Ca, were synthesized by hydrothermal treatment. These materials were characterized using techniques such as EDX, XRD, SEM, TGA, FTIR, etc. Stabilization behavior of synthesized material towards PVC was studied using thermal and color stability measurements. A comparative study was performed keeping the anion layer the same while substituting the ''Mg'' of the cationic layer by Ca. The cations present in the hydrotalcite structure have a pronounced role while hydrotalcite works as an anion-exchanger and is used as a halogen-scavenger in poly (vinyl chloride). The paper concludes with a brief discussion of the mechanism involved in the halogen-scavenging process when hydrotalcites were used as a stabilizer in PVC.

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