Crystallization behaviors of polypropylene/montmorillonite nanocomposites

Ma, Jisheng; Zhang, Shimin; Zhang, Qi; Li, Ge; Hu, Youliang

doi:10.1002/app.10127

Cited by 207 publications

(145 citation statements)

References 14 publications

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“…Many studies have shown a nucleating effect of nanoclay for different polymers [16][17][18]. This effect can be used to enhance the mechanical and thermal properties of the polymer.…”

Section: Thermal Propertiesmentioning

confidence: 99%

Effect of clay types on the processing and properties of polypropylene nanocomposites

Lei

Hoa

Ton‐That

2006

Composites Science and Technology

127

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The effect of clay chemistries and sources on the processing and properties of the nanocomposites made therefrom has been studied. A number of nanocomposites were prepared using different types of clay by melt processing using a Brabender plasticorder. Various analysis techniques were used to characterize the dispersion and the properties of the nanocomposites, using scanning electron microscopy (SEM), differential scanning calorimetry (DSC) and dynamical mechanical analysis (DMA).

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“…Many studies have shown a nucleating effect of nanoclay for different polymers [16][17][18]. This effect can be used to enhance the mechanical and thermal properties of the polymer.…”

Section: Thermal Propertiesmentioning

confidence: 99%

Effect of clay types on the processing and properties of polypropylene nanocomposites

Lei

Hoa

Ton‐That

2006

Composites Science and Technology

127

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“…Regarding the effect of cooling rate on the crystallization peak temperature (Figure 3), it is found that the crystallization peak temperature range becomes broader and shifts to lower temperatures for sPS and its nanocomposites as the cooling rate increased. When the specimens were cooled quickly, more supercooling was required to initiate crystallization, because the motion of the sPS molecules could not follow the cooling rate [50,51]. With increasing the cooling rate, the crystallization peak temperature corresponding to the maximum crystallization rate shifted to lower temperature, indicating that the lower the cooling rate, the earlier crystallization occurs.…”

Section: Thermal Behaviormentioning

confidence: 99%

Non-isothermal crystallization kinetics of syndiotactic polystyrene polystyrene functionalized SWNTs nanocomposites

Xiong

Gao²,

Li³

2007

Express Polym. Lett.

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Carbon nanotubes (CNTs) are unique nanostructured materials with remarkable physical, mechanical and electronic properties [1][2][3][4]. These properties make them attractive for applications in many scientific and technological fields such as electronic structures [5], polymer composites [6], and biological systems [7]. Among these potential applications, the prospect of obtaining high-performance CNT based polymeric nanocomposites has attracted the efforts of researchers in both academia and industry [8]. The combination of organic polymer components with CNT fillers in a single material has extraordinary significance for the development of advanced materials with remarkable mechanical, electrical, thermal and multifunctional properties [9][10][11][12]. Moreover, polymer/CNT nanocomposites challenge traditional filled polymers (loadings of 20 wt% or more) in many of these areas by providing similar physical enhancements but with as little as about 1 wt% addition of dispersed nanotubes [13]. Previous CNT based polymeric nanocomposites reports include increased modulus, impact strength, heat distortion temperature, and barrier properties with decreased thermal expansivity [14][15][16]. In addition, these nanocomposites are finding potential applications such as electrostatically dissipative materials and aerospace materials [17]. Currently, several processing methods, including melt mixing, solution process and in-situ polymerization [18][19][20] Abstract. Non-isothermal crystallization kinetics were characterized by using differential scanning calorimetry (DSC) analysis on neat semicrystalline syndiotactic polystyrene (sPS) and its nanocomposites with polystyrene (PS) functionalized full-length single walled carbon nanotubes (SWNT-PS), which was prepared by copper (I) catalyzed click coupling of alkyne-decorated SWNTs with well-defined, azide-terminated PS. The crystallization behavior of neat sPS polymer was compared to its SWNT based nanocomposites. The results suggested that the non-isothermal crystallization behavior of sPS/SWNT-PS nanocomposites depended significantly on the SWNT-PS contents and cooling rate. The incorporation of SWNT-PS caused a change in the mechanism of nucleation and the crystal growth of sPS crystallites, this effect being more significant at lower SWNT-PS content. Combined Avrami and Ozawa analysis was found to be effective in describing the non-isothermal crystallization of the neat sPS and its nanocomposites. The activation energy of sPS determined from nonisothermal data decreased with the presence of small quantity of SWNT-PS in the nanocomposites and then increased with increasing SWNT-PS contents.

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“…A decrease in spherulite size and an increase in crystallization rate with augmenting clay content in PP nanocomposites have been reported. [14,20,21] The presence of excessive unreacted organic molecules in the OM has been reported to have detrimental effect on the thermal stability and properties of the composites. [2,[22][23][24] The ammonium head group of the surfactant is susceptible to degradation at the high compounding temperatures and the thermal stability of the organic coating is a serious concern.…”

Section: Introductionmentioning

confidence: 99%

Poly(propylene)‐Layered Silicate Nanocomposites: Gas Permeation Properties and Clay Exfoliation

Osman

Mittal

Suter

2007

Macro Chemistry & Physics

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To monitor the mineral surface coverage and energy, the inorganic cations of two clays (montmorillonite) with different surface area/cation have been exchanged by alkylammonium ions, carrying alkyl chains of different number and length. The prepared OMs were free of unreacted organic ions. With increasing length and number of the alkyl chains, an increase in the basal‐plane spacing (d‐spacing) of the OM was observed. The d‐spacing also increased with increasing CEC of the clay (decreasing available area/cation). The OMs were compounded with PP and their effect on the crystallinity and gas‐barrier properties of the polymer was investigated. The OM had no influence on the degree of crystallinity of PP under the processing conditions used. Oxygen permeation through the composites decreased, depending on the cross‐sectional area of the exchanged organic cation and the CEC of the clay. These parameters control the mineral surface coverage (consequently the surface energy) as well as the tilt angle of the alkyl chains to the mineral surface, and hence the d‐spacing. Increasing the length of the alkyl chains and their number per cation enhanced the d‐spacing, clay exfoliation, and the gas‐barrier properties of the composites. A mixed morphology, consisting of delaminated aluminosilicate layers and OM tactoids of varying thickness was observed but no intercalation took place. The oxygen permeation coefficient of the nanocomposites was found to be a non‐linear function of the volume fraction of the inorganic part of the OM.magnified image

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Crystallization behaviors of polypropylene/montmorillonite nanocomposites

Cited by 207 publications

References 14 publications

Effect of clay types on the processing and properties of polypropylene nanocomposites

Effect of clay types on the processing and properties of polypropylene nanocomposites

Non-isothermal crystallization kinetics of syndiotactic polystyrene polystyrene functionalized SWNTs nanocomposites

Poly(propylene)‐Layered Silicate Nanocomposites: Gas Permeation Properties and Clay Exfoliation

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