Non-isothermal crystallization kinetics and activity of filler in polypropylene/Mg–Al layered double hydroxide nanocomposites

Raso, Mònica Ardanuy; Velasco, José Ignácio; Realinho, Vera; Arencón, D.; Martínez, Alejandro Rosillo

doi:10.1016/j.tca.2008.09.016

Cited by 39 publications

(29 citation statements)

References 34 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…The activation energy of non-isothermal crystallization of PECN15 is lower than that of pure MDPE, showing that the clay acts as a nucleating agent and accelerates the non-isothermal crystallization of MDPE. Similar results have been reported for high density polyethylene-silica NCs(Kim et al 2010) and polypropylene-Mg-Al layered double hydroxide NCs(Ardanuy et al 2008).…”

supporting

confidence: 89%

Non-isothermal crystallization kinetics of polyethylene-clay nanocomposites prepared by high-energy ball milling

2014

View full text Add to dashboard Cite

Non-isothermal crystallization kinetics of pure medium density polyethylene (MDPE) and MDPEclay nanocomposites have been investigated by differential scanning calorimeter. The modified Avrami, Ozawa, Liu and Ziabicki equations have been applied to describe non-isothermal crystallization process. The results of Avrami analysis showed a very complicated crystallization mechanism. Although, Ozawa equation failed to provide an adequate description for non-isothermal crystallization process, Liu equation could describe it well. The data showed the crystallization rate of MDPE and nanocomposites raises with increasing cooling rate and the crystallization rate of nanocomposite is faster than that of MDPE at a given cooling rate. Ziabicki's kinetic crystallizability index showed that clay can increase the ability of MDPE to crystallize, when it is cooled at unit cooling rate. The activation energy of samples has been evaluated by Kissinger method. The results showed that the activation energy of nanocomposite was lower than that of MDPE.

show abstract

supporting

confidence: 89%

Non-isothermal crystallization kinetics of polyethylene-clay nanocomposites prepared by high-energy ball milling

2014

View full text Add to dashboard Cite

show abstract

“…in the nanocomposite (pH 4.8). Due to the repulsions between -NH 3 ? , H 2 O molecule is allowed to penetrate into the Chitosan nanocomposite.…”

Section: Thermal Studymentioning

confidence: 99%

“…and M 3? are metal cations occupying the center of the octahedral coordination, and A n-is an interlayer anion between the hydroxide layers [3,4]. Layered hydroxide salts (LHS, M þ2 ðOHÞ 2Àx ðA Àn Þ x=n :yH 2 O) is also similar in the layered structure to that of brucite, but instead of the metal replacement, and hydroxide ions are removed from the structure and replaced by water molecules [5].…”

Section: Introductionmentioning

confidence: 99%

Controlled release of Diclofenac, an anti-inflammatory drug by nanocompositing with layered zinc hydroxide

Nabipour

Sadr

2015

J Porous Mater

View full text Add to dashboard Cite

The anti-inflammatory drug, Diclofenac (DIC) anion, was intercalated into the layered zinc hydroxide (LZH) by ion-exchange method. Then, the DIC-LZH/ Chitosan nanocomposite was prepared by coating of Chitosan on DIC-LZH. LZH intercalated with DIC was successfully encapsulated into Chitosan by precipitation method. The structures of the obtained products were studied by powder X-ray diffraction, FT-IR spectroscopy, scanning electron microscopy, and thermal analysis. The XRD patterns and FTIR analyses showed that the DIC was successfully intercalated into the LZH interlayer space with an average basal spacing of 29.42 Å . Thermal analysis studies confirmed that the thermal stability of DIC was enhanced after intercalation into LZH. In addition, drug release behaviors in vitro of DIC from DIC-LZH and DIC-LZH/Chitosan nanocomposites were observed in phosphate buffer solution under the conditions of pH 4.8 and 7.4, respectively.

show abstract

“…The general formula is [M 1Àx 2+ M x 3+ (OH) 2 ] x+ A X/n nÀ mH 2 O, where M 2+ and M 3+ are the di-and trivalent metal cations, respectively, that occupy octahedral positions in the hydroxide layers, and A nÀ is an interlayer anion. 6,7 LDHs have been prepared with organic anions 8,9 and polymeric species anions. 10,11 LDHs have stronger interactions between the layers than silicates because of the higher charge density in the crystal structures that hinders the exfoliation of LDH nanolayers and the intercalation of polymer chains.…”

Section: Introductionmentioning

confidence: 99%

Synthesis and characterization of an exfoliated modified syndiotactic polystyrene/Mg–Al-layered double-hydroxide nanocomposite

Jaymand

2010

Polym J

View full text Add to dashboard Cite

This paper describes the synthesis and characterization of a controlled graft and block copolymerization onto syndiotactic polystyrene (sPS) using nitroxide-mediated living radical polymerization and the preparation of its polymer/layered doublehydroxide (LDH) nanocomposite. The graft and block copolymerization of styrene and p-methylstyrene were initiated with arylated sPS carrying 2,2,6,6-tetramethyl-1-piperidinyloxy groups as a macroinitiator. The structures of obtained graft and block copolymers were determined by 1 H nuclear magnetic resonance and Fourier transform infrared spectroscopy. The MgAl(Cl)-LDH precursor was prepared with microwave irradiation using a mixed solution of MgCl 2 and AlCl 3 , which was slowly pumped into decarbonated water. Thereafter, the surfactant-modified MgAl(SDBS) was obtained by the anion exchange reaction of MgAl(Cl)-LDH with sodium dodecyl benzene sulfate (SDBS). Finally, the sPS-g-(PS-b-PMS)/MgAl-LDH nanocomposite was prepared by a solution intercalation method. The exfoliated structure of the nanocomposite was probed by X-ray diffraction and transmission electron microscopy (TEM). Compared with pure sPS-g-(PS-b-PMS), the nanocomposite shows a much higher decomposition temperature and higher glass transition temperature. Keywords: functionalization; layered double hydroxide; living radical polymerization; modification; nanocomposite; syndiotactic polystyrene INTRODUCTIONRecently, there has been considerable interest in polymer/layered inorganic nanocomposites because of their different, often remarkably enhanced mechanical, thermal, electrical, optical and magnetic properties, which are rarely present in pure polymer or conventional composite. These enhanced properties are mainly attributed to the high degree of dispersion of layered inorganic compounds within the polymer matrix. 1-3 The layered materials include graphite and graphite oxide; metal chalcogenides such as molybdenum, titanium and lead sulfides; layered phosphates such as zirconium hydrogen phosphate; clays and layered silicates such as montmorillonite, hectorite and saponite; and layered double hydroxides (LDHs). 4,5 LDHs are a family of lamellar compounds that contain exchangeable ions in the interlayer space (anionic clays). The structure consists of brucite-like sheets with a typical thickness of 0.5 nm, in which the partial substitution of trivalent for divalent metallic ions results in a positive charge that is compensated by anions within the interlayer galleries. The general formula is [M 1Àx 2+ M x 3+ (OH) 2 ] x+ A X/n

show abstract

Non-isothermal crystallization kinetics and activity of filler in polypropylene/Mg–Al layered double hydroxide nanocomposites

Cited by 39 publications

References 34 publications

Non-isothermal crystallization kinetics of polyethylene-clay nanocomposites prepared by high-energy ball milling

Non-isothermal crystallization kinetics of polyethylene-clay nanocomposites prepared by high-energy ball milling

Controlled release of Diclofenac, an anti-inflammatory drug by nanocompositing with layered zinc hydroxide

Synthesis and characterization of an exfoliated modified syndiotactic polystyrene/Mg–Al-layered double-hydroxide nanocomposite

Contact Info

Product

Resources

About