On the action of hydrotalcite-like clay materials as stabilizers in polyvinylchloride

Ven, Leo van der; Gemert, M.L.M van; Batenburg, Lawrence F.; Keern, J.J; Gielgens, L.H; Koster, T.P.M.; Fischer, Hartmut

doi:10.1016/s0169-1317(00)00002-8

Cited by 154 publications

(82 citation statements)

References 6 publications

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“…Owing to its high anion- Figure 1. Structure of layered double hydroxide exchange capacity, LDHs have found many potential applications, including those in pharmaceuticals, catalyst supports, inorganic fillers and acid killers [14] to prevent the degradation of polymeric materials by effectively scavenging any acid generated during processing as well as during application. Ethylene propylene diene monomer (EPDM) rubber is widely used due to its good mechanical properties, very low unsaturation and associated resistance to ageing and ozone deterioration [15].…”

Section: Introductionmentioning

confidence: 99%

Photo-oxidation of EPDM/layered double hydroxides composites: Influence of layered hydroxides and stabilizers

Kumar¹,

Rana²,

Singh³

2007

Express Polym. Lett.

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Abstract. The photo-oxidation of ethylene propylene diene monomer (EPDM)/ layered double hydroxide (LDH) composites as well as EPDM/LDH with stabilizers is studied under accelerated UV irradiation (λ ≥ 290 nm) at 60°C for different time intervals. The development of functional groups during oxidation was monitored by FT-IR spectroscopy. The photodegradation of the pristine polymer and composites take place and the increase in hydroxyl and carbonyl groups with irradiation times, was estimated. EPDM filled LDH showed higher degradation rate than pristine EPDM, while in acidic medium EPDM/LDH showed almost equal degradation as in isolated conditions. These results show the advantages of LDHs as a filler as well as an acid killer. The effect of stabilizers is very less because of their concentration in comparison of LDH.

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Section: Introductionmentioning

confidence: 99%

Photo-oxidation of EPDM/layered double hydroxides composites: Influence of layered hydroxides and stabilizers

Kumar¹,

Rana²,

Singh³

2007

Express Polym. Lett.

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“…There is currently an increasing interest in LDHs, due to their properties as catalysts and catalyst supports 9,12,54 , antacids 9,[55][56] , trapping agents for anionic contaminants [57][58][59][60] , flame retardants 9,61 , polymer stabilizers 9,62 , molecular sieves 5 , ion exchangers and adsorbents 63,64 . New areas have been investigated for applications in the field of medicine 65,66 , thin films 67 , conducting materials 68,69 , electrodes [70][71][72] and corrosion protection [73][74][75] .…”

Section: Introductionmentioning

confidence: 99%

Review of the synthesis of layered double hydroxides: a thermodynamic approach

Bravo-Suárez¹,

Páez‐Mozo²,

Oyama³

2004

Quím. Nova

120

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Recebido em 29/4/03; aceito em 3/11/03; publicado na web em 27/05/04The synthesis of layered double hydroxides (LDHs) by hydrothermal-LDH reconstruction and coprecipitation methods is reviewed using a thermodynamic approach. A mixture model was used for the estimation of the thermodynamics of formation of LDHs. The synthesis and solubility of LDHs are discussed in terms of standard molar Gibbs free energy change of reaction. Data for numerous divalent and trivalent metals as well as for some monovalent and tetravalent metals that may be part of the LDH structure have been compiled. Good agreement is found between theoretical and experimental data. Diagrams and tables for the prediction of possible new LDH materials are provided.

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“…The top pattern 5 is that of Alcamizer alone, with its intensity scaled down considerably, to enable this pattern to be compared with those from extrudates. [1][2][3][4] In the figure it is very evident that as the Alcamizer content of extrudate is increased, the main reflections of the hydrotalcite, at 2h511?65 and 23?42u, increase accordingly. There are two other points to note.…”

Section: Characterisation Of Extrudatesmentioning

confidence: 92%

“…van der Ven et al 1 evaluated the stability of PVC with a range of hydrotalcite like materials of the general formula of Mg 3 ZnAl 2 (OH) 12 .A.nH 2 O with different anions (A). They concluded that the stabilisation offered by hydrotalcites relates to the capacity of the materials to react with HCl formed during the degradation of PVC through a two step process: first, the interlayer anions react with HCl and second, the hydroxide layers are lost as these react with HCl to form metal chlorides.…”

Section: Introduction and Objectivesmentioning

confidence: 99%

Melt compounding of rigid PVC formulations with hydrotalcites

Hitt¹,

Haworth²,

Thomas³

et al. 2008

Plastics, Rubber and Composites

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Hydrotalcites, compounds of magnesium-aluminium-hydroxycarbonate, are promoted as environmentally safe materials for costabilisation of PVC products. Commercial grades of hydrotalcites have been added to rigid PVC formulations, containing a range of different stabiliser types, to evaluate their contribution to heat stability and their effect on mechanical properties. Hydrotalcites are confirmed to be effective costabilisers for rigid PVC: static thermal stability (through oven testing) and dynamic thermal stability (via torque rheometry) of PVC compounds are modified by their presence. The extent of change is determined by the primary stabiliser type and the grade of the hydrotalcite. Detailed analysis of mechanical properties has been carried out on compression moulded samples and on extruded compounds. With the former, no significant change in tensile or impact performance was observed, for hydrotalcite levels up to 5 phr. Charpy impact data on extruded PVC have shown significant increase in performance of compounds containing an acrylate modifier when hydrotalcites are used.

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On the action of hydrotalcite-like clay materials as stabilizers in polyvinylchloride

Cited by 154 publications

References 6 publications

Photo-oxidation of EPDM/layered double hydroxides composites: Influence of layered hydroxides and stabilizers

Photo-oxidation of EPDM/layered double hydroxides composites: Influence of layered hydroxides and stabilizers

Review of the synthesis of layered double hydroxides: a thermodynamic approach

Melt compounding of rigid PVC formulations with hydrotalcites

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