Preparation and nonisothermal crystallization behavior of polypropylene/layered double hydroxide nanocomposites

Lonkar, Sunil P.; Morlat‐Thérias, Sandrine; Caperaa, Nathalie; Leroux, Fabrice; Gardette, Jean‐Luc; Singh, R. P.

doi:10.1016/j.polymer.2009.01.031

Cited by 119 publications

(87 citation statements)

References 46 publications

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“…Besides the modification on mechanical properties due to the reinforcement by the clay nanolayers, there is an important aspect to be studied: the influence of the nanolayers on the crystallinity of the PP that can, by itself play a role on the final properties of the nanocomposite. In semicrystalline polymers, the nucleation stage is a critical step on crystallization process and parameters like crystallization rate, degree of crystallinity, morphology and spherulites size directly affect the final physical properties [13][14][15] . The crystallization of iPP (isotactic polypropylene) is controlled by the nucleation stage, and the addition of nucleating agents to shorten the induction time of crystallization and accelerate the formation of crystalline nuclei is a technique commonly used in the polymer industry to decrease injection-molding cycle times [13] .…”

Section: Introductionmentioning

confidence: 99%

“…The nonisothermal crystallization behavior of nylon6(PA6)/attapulgite (AT) composites was studied by Shi et al [17] using differential scanning calorimetry, which indicated that AT nano-particles acted as nucleating agents during the crystallization of PA6/AT blends. Several authors present results based on PP crystallization process [13,[18][19][20][21][22] . The nucleating effect of nanoparticules of montmorilonite on crystallization process of systems based on PP + PP-g-MA (maleic anhydride grafted polypropylene) has been studied by Maiti et al [23] , and they related the decrease of spherulite size with increasing clay content which indicates that clay particles act as nucleating agents.…”

Section: Introductionmentioning

confidence: 99%

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Morphology, structure and mechanical properties of polypropylene modified with organophilic montmorillonite

et al. 2012

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Abstract:The aim of this work is to study the properties of systems based on polypropylene (PP) and commercial organophilic montmorillonite, prepared by melt intercalation. Because of the non polar character of PP, the polypropylene-graft-maleic anhydride (PP-g-MA) was used as compatibilizer. Materials containing 2.5, 5, 7.5 and 10% of clay and PP, and two extra compositions containing only PP and 15 and 30% of PP-g-MA were processed using a twin-screw extruder. The level of clay dispersion was characterized by X ray diffraction, showing exfoliated/intercalated structures for different concentrations of clay. The crystallization behavior was studied by differential scanning calorimetry (DSC) and polarizing optical microscopy (POM) with hot stage. Tensile properties were also studied and presented a moderate improvement with increase in clay concentration.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Morphology, structure and mechanical properties of polypropylene modified with organophilic montmorillonite

et al. 2012

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“…Other peaks can be easily assigned as follows: 2928 and 2853 cm -1 (aliphatic C-H stretch); However, according to the individual dodecyl sulphate chain length (ca. 2 nm) [2], the individual laurylether phosphate chain length is close to 2 nm. This leads to the conclusion that the orientations of PK in the gallery of LDHs may be essentially inclined bilayer (see Figure 1).…”

Section: Characterization Of Ldhsmentioning

confidence: 80%

“…In recent years polymer nanocomposites based on layered double hydroxides (LDHs) have attracted considerable attention because they can be considered to be reinforced by the nanofiller and follow the various unique properties such as enhanced mechanical properties, thermal stability, and reduced flammability [1][2][3][4][5][6][7]. LDHs (like CO 3 2-, Cl -, SO 4 2-, and various organic carboxylates, sulfates, sulfonates), respectively, where n is the number of associated water molecules [8].…”

Section: Introductionmentioning

confidence: 99%

A new route to prepare nanocomposites based on polyvinyl chloride and MgAl layered double hydroxide intercalated with laurylether phosphate

Huang¹,

Wang²

2009

Express Polym. Lett.

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Abstract. The MgAl layered double hydroxide (LDH) with laurylether phosphate was prepared using reconstruction method. Delamilation of the LDH with laurylether phosphate (LDH-PK) in tetrahydrofuran was characterized by AFM (atomic force microscopy), indicating that a large part of the LDH was delaminated into single, double and multi layers. The delaminated LDH-PK suspension was then used with polyvinyl chloride (PVC) to prepare a series of high-LDH-loading nanocomposites. Both the XRD (X-ray diffraction) patterns and TEM (transmission electron microscopy) photographs of the as-prepared PVC/LDH nanocomposites indicated that the LDH nanolayers dispersed uniformly in the PVC matrix. With differential scanning calorimetry (DSC) the glass transition temperatures of PVC phases in the PVC/LDH nanocomposites were measured and a slightly lower value than that of pristine PVC has been observed. Thermogravimetric analysis results show that the presence of LDH enhanced the dehydrochlorination temperature (Tmax1), reduced the maximum degradation rate (Rmax1) and the 5% weight loss temperature, and promoted the char formation of PVC. However, the thermal degradation temperature (Tmax2) and thermal degradation rate (Rmax2) of the dehydrochlorinated PVC were slightly affected by the presence of LDH. The apparent activation energies were calculated by the method of Flynn-Wall-Ozawa in nitrogen at four different heating rates, showing that the nanofiller increased the apparent activation energies by 10-26 kJ/mol when compared with pristine PVC, probably implying that the LDH nanolayers improve the stability of chlorine atom on the PVC chains.

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“…[7][8][9][10][11] In this paper, the isothermal crystallization kinetics of a novel functional PP (FPP), i.e. methacryloxyethyltrimethyl ammonium chloride (DMC) grafted PP was investigated by differential scanning calorimetry (DSC).…”

Section: Introductionmentioning

confidence: 99%

Isothermal Crystallization Kinetics of Quaternary Ammonium Group Grafted Polypropylene

Liu¹

2015

Polymer Korea

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In this paper, the isothermal crystallization kinetics of a functional PP (FPP) with different grafting yields (GY)-methacryloxyethyltrimethyl ammonium chloride (DMC) grafted PP were investigated by differential scanning calorimetry (DSC). The results showed that the crystallization rate of FPP (GY=4.83%) was the highest for all of the studied samples. Furthermore, for the FPP with different GY, the value of t 1/2 became longer with increasing the grafting yield (GY). The possible explanation was that the quaternary ammonium groups introduced affected the crystallization process of the FPP in two opposite directions, i.e. promoting the nucleation and hindering the transport of the chain molecules towards the growing nuclei. Polarized optical micrographs showed that the DMC chains acted as nucleating agents, which accelerated the nucleation. In addition, the results showed the FPP had lower nucleation free energy than the PP. This study would be useful for designing the processing parameters of the grafted samples.

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Preparation and nonisothermal crystallization behavior of polypropylene/layered double hydroxide nanocomposites

Cited by 119 publications

References 46 publications

Morphology, structure and mechanical properties of polypropylene modified with organophilic montmorillonite

Morphology, structure and mechanical properties of polypropylene modified with organophilic montmorillonite

A new route to prepare nanocomposites based on polyvinyl chloride and MgAl layered double hydroxide intercalated with laurylether phosphate

Isothermal Crystallization Kinetics of Quaternary Ammonium Group Grafted Polypropylene

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