Crystallization behavior and mechanical properties of polypropylene/halloysite composites

Ning, Nanying; Yin, Qinjian; Luo, Feng; Zhang, Qin; Du, Rongni; Fu, Qiang

doi:10.1016/j.polymer.2007.10.005

Cited by 222 publications

(137 citation statements)

References 37 publications

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“…The authors documented a significant improvement in the resulting end use properties of the PP composites containing 30 wt% halloysite. The last referred example of PP/halloysite composite modification was carried out with bis-2-hydroxyethyl, quaternary ammonium solutions [26]. However, only negligible increases in the mechanical properties were observed.…”

mentioning

confidence: 99%

The effect of halloysite modification combined with in situ matrix modifications on the structure and properties of polypropylene/halloysite nanocomposites

Khünová¹,

Kristóf²,

Kelnar³

et al. 2013

Express Polym. Lett.

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The effect of various modifications/intercalations of halloysite and the combination of these modifications with in situ PP matrix modification was investigated with respect to the structure and properties of the polypropylene/halloysite nanocomposites. Hexadecyl-tri-methyl-ammonium-bromide (HEDA), 3-aminopropyltrimethoxysilane and urea were used as the intercalators/modifiers. The best intercalation was found for urea, although an unexpected insignificant impact on the mechanical properties also resulted as a consequence of the urea polarity and the significant decrease in PP crystallinity. However, the simultaneous application of 4,4!-diphenylmethylene dimaleinimide (DBMI) brought about an increase in the mechanical behavior by increasing the halloysite/PP affinity as a result of in situ matrix modification. This effect was further supported by coupling between the PP and halloysite (HNT) in the system containing urea-intercalated HNT. This can be explained by the occurrence of a urea-supported reaction between the imide ring of DBMI and the OH groups of the HNT, which resulted in the best mechanical behaviors achieved in this study

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mentioning

confidence: 99%

The effect of halloysite modification combined with in situ matrix modifications on the structure and properties of polypropylene/halloysite nanocomposites

Khünová¹,

Kristóf²,

Kelnar³

et al. 2013

Express Polym. Lett.

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“…[6] found uniform combination of HNTs in PP matrix for every samples prepared with varying content, and acts as a nucleation agent, showing an improvement of the whole crystallization rate. On the other side, they observed that at given isothermal crystallization temperature there is constant growth of spherulite, and suggested that spherulite expansion and nucleation are two independent methods.…”

Section: Morphology and Crystallization Behaviormentioning

confidence: 77%

“…%) and surface modification on the flame retardant property and thermal stability of PP/HNTs nanocomposites [4]. Furthermore, surface modification or treatment of the fillers also imparts good wetting property of with polymers by adding nanoparticles in a solution process [5][6]. Due to its well-balanced physical and mechanical properties and easy processability at a relatively low cost Polypropylene (PP) as an important commercial plastic is widely used to produce household goods and automotive parts.…”

Section: Introductionmentioning

confidence: 99%

Current Research Trends in Modification / Interaction of Halloysite Nanotube Filled Polymer Blends and Its Composites: A Review

2015

IJSR

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These Halloysite is a naturally occurring aluminosilicate material (Al2Si2O5(OH)4.2H2O) with hollow tubular structure which is obtained from mines as natural deposits. Halloysite shows unique surface chemical property because of its multi-layer structure with a few hydroxyl groups present on the surface of the nanotubes. Due to the weak secondary interactions between the nanotubes by hydrogen bonds and van derWaal's forces halloysite can be easily dispersed in a non-polar polymer matrix such as polupropylene as compared to any other layer silicates. Today we know the HNT's filled polymer blends and its composites is because of various researches carried out over many years. Researchers have toiled hard to improve the thermomechanical performance and physical properties with various experiments. A looking down with hatred of different approaches, every new research shares the same objectives of getting superior thermomechanical performance and physical properties at very lower filler loadings compared to conventional polymer composites. This paper reviews the vast array of research work carried out within past decades for the modifications/intercalations of HNTs to improve the dispersion and physical properties of the nanocomposites. This study is mainly focused on the aspects related to improve the mechanical, thermal and physical properties of the nanocomposite. It reports the research trends in modification/interaction of HNTs filled polymer blends and its composites.

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“…Bonding defects between the alumina and silica lead to net negative and positive charges on the exterior and interior lumen, respectively [5,6]. HNTs are capable of enhancing the material properties of many polymer matrices [7][8][9][10]. HNTs have been widely used as a nanostructured reinforcement material for polymers that exhibit low mechanical strengths [7,8].…”

Section: Introductionmentioning

confidence: 99%

“…HNTs are capable of enhancing the material properties of many polymer matrices [7][8][9][10]. HNTs have been widely used as a nanostructured reinforcement material for polymers that exhibit low mechanical strengths [7,8]. Modification of these nanotubes through surface coatings and other preparations can further enhance the strength and dispersion of the HNTs within the polymer [9,10].…”

Section: Introductionmentioning

confidence: 99%

Dry Sintered Metal Coating of Halloysite Nanotubes

et al. 2016

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Abstract:Halloysite nanotubes (HNTs) are a naturally-occurring aluminosilicate whose dimensions measure microns in length and tens of nanometers in diameter. Bonding defects between the alumina and silica lead to net negative and positive charges on the exterior and interior lumen, respectively. HNTs have been shown to enhance the material properties of polymer matrices and enable the sustained release of loaded chemicals, drugs, and growth factors. Due to the net charges, these nanotubes can also be readily coated in layered-depositions using the HNT exterior lumen's net negative charge as the basis for assembly. These coatings are primarily done through wet chemical processes, the majority of which are limited in their use of desired chemicals, due to the polarity of the halloysite. Furthermore, this restriction in the type of chemicals used often requires the use of more toxic chemicals in place of greener options, and typically necessitates the use of a significantly longer chemical process to achieve the desired coating. In this study, we show that HNTs can be coated with metal acetylacetonates-compounds primarily employed in the synthesis of nanoparticles, as metal catalysts, and as NMR shift reagents-through a dry sintering process. This method was capable of thermally decaying the metal acetylacetonate, resulting in a free positively-charged metal ion that readily bonded to the negatively-charged HNT exterior, resulting in metallic coatings forming on the HNT surface. Our coating method may enable greater deposition of coated material onto these nanotubes as required for a desired application. Furthermore, the use of chemical processes using toxic chemicals is not required, thus eliminating exposure to toxic chemicals and costs associated with the disposal of the resultant chemical waste.

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Crystallization behavior and mechanical properties of polypropylene/halloysite composites

Cited by 222 publications

References 37 publications

The effect of halloysite modification combined with in situ matrix modifications on the structure and properties of polypropylene/halloysite nanocomposites

The effect of halloysite modification combined with in situ matrix modifications on the structure and properties of polypropylene/halloysite nanocomposites

Current Research Trends in Modification / Interaction of Halloysite Nanotube Filled Polymer Blends and Its Composites: A Review

Dry Sintered Metal Coating of Halloysite Nanotubes

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