The effect of the interface structure of different surface‐modified nano‐SiO<sub>2</sub> on the mechanical properties of nylon 66 composites

Xu, Xiaoyan; Li, Binjie; Lu, Huimin; Zhang, Zhijun; Wang, Honggang

doi:10.1002/app.27325

Cited by 44 publications

(29 citation statements)

References 22 publications

(23 reference statements)

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“…The interfacial strength between nanosilica and PA6 is a key factor where the surface amino groups of nanosilica can form the chemically bonding action with the end carboxyl groups of PA6, and whether and to what extent the reaction between the surface amino groups of nanosilica and the end carboxyl groups of PA6 occurred usually affect the mechanical strength. The results also indicated that the reacting amino groups was benefi cial to improve the mechanical properties due to the tiny lattice structure via the reaction between surface amino groups and molecular chains of PA6 9, 13 . In addition, the crystal structure inside PA6 is also an important factor for understanding the mechanical properties of PA6/SiO 2 nanocomposites where the α crystal type is benefi cial to the improvement of mechanical strength of nanocomposites 14, 15 , while the diffraction peaks of α crystal gradually increased from PRA0 to PRA5.…”

Section: Crystal Structures Analysismentioning

confidence: 93%

The effect of surface functional groups of nanosilica on the properties of polyamide 6/SiO₂ nanocomposite

Chen

et al. 2013

Polish Journal of Chemical Technology

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The present study investigated the effect of the surface functional groups of nanosilica on the interfacial, crystallization, and thermal stability of polyamide 6/SiO 2 (PA6/SiO 2 ) nanocomposite, in which nanosilica was modifi ed in situ with both 3-triethoxysilylpropylamine and 3-methacryloxypropyltrimethoxy silane¬ (KH-550 and KH-570). The FTIR analysis results showed the chemical bonding action between the reacting amino groups of nanosilica and end carboxyl groups of polyamide 6 enhanced with increasing the ratio of KH-550 and KH-570. The XRD spectrum indicated that the crystal structure of PA6/SiO 2 nanocomposites tended to form α crystal type that was benefi cial to an improvement of mechanical properties, and which was in agreement with the results of mechanical strength measurements. It was also found that crystallization temperature and crystallization rate of PA6/SiO 2 nanocomposites were lower than that of neat polyamide 6.

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Section: Crystal Structures Analysismentioning

confidence: 93%

The effect of surface functional groups of nanosilica on the properties of polyamide 6/SiO₂ nanocomposite

Chen

et al. 2013

Polish Journal of Chemical Technology

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“…Xu et al [117] observed that silica nanoparticles with a modifi ed surface effectively hindered the diffusion process of polymer chain segments and, at the same time, also acted as a nucleating agent. However, because these two competing processes were acting simultaneously, no distinct changes were observed in the crystallinity of Nylon 66 in the nanocomposites as compared to that of neat Nylon 66.…”

Section: Nylon 66mentioning

confidence: 99%

Crystallization in Polymer Nanocomposites

Jog

2010

Optimization of Polymer Nanocomposite Properties

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Over the past decade, polymer nanocomposites have been a topic of great interest to research groups in both pure and applied materials science [1 -4] . These nanocomposites are two -phase materials wherein a fi ller with at least one dimension in the range of 1 to 100 nm is dispersed in the polymer matrix. Various nanofi llers such as carbon nanotube s ( CNT s), inorganic nanoparticles, or layered silicates such as clay are used. These nanocomposites show remarkable property improvements as compared to virgin polymers; moreover, this occurs at very low fi ller loadings when compared to conventional microcomposites. The properties of these nanocomposites are dependent on the morphology generated during their processing. In the case of semi -crystalline polymers, this is more crucial as the crystallization of polymers takes place during processing. A knowledge of the crystallization process, and the effect of these nanofi llers on the crystallization behavior of polymer nanocomposites, is therefore imperative to acquire an understanding of structure -property relationships in polymer nanocomposites.Crystallization in polymers has been the subject of great academic interest, as polymers are known to exhibit a variety of structures at various length scales, such as the unit -cell, lamella, and spherulites. The crystallization of polymers results in different morphologies, depending on the crystallization conditions and the presence of other components. The presence of a second phase either a polymer or a low -molecular -weight compound or inorganic fi ller has a profound effect on the crystallization of the polymer. In nanocomposites, the dimensions of the second phase are close to the chain dimensions, and a number of studies have attempted to elucidate the effect of nanosized fi llers on the crystallization kinetics, the crystalline morphology, and the crystalline forms of polymers. In this chapter, a brief review is presented of recent investigations into the effects of nanofi llers on various aspects of crystallization, such as isothermal crystallization, nonisothermal crystallization, spherulitic growth, and polymorphism.

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“…The sol-gel approach, used to synthesize PA6 nanomaterials has received considerable interest in recent decades. However, most previous studies investigated PA6 films or sheets with nanoscale SiO 2 mainly distributed on the surface of the PA6 matrices at low-volume loading [30][31][32][33]. The preparation of PA6/SiO 2 composites, especially microspheres with high dispersion and high loading weight, is more challenging and rarely reported.…”

Section: Introductionmentioning

confidence: 99%

Preparation and characterization of novel PA6/SiO2 composite microsphere applied for selective laser sintering

Wang¹,

Liu²,

Zhang³

et al. 2018

Express Polym. Lett.

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Abstract. The high cost and less variety of raw materials has greatly restricted the wide application of selective laser sintering (SLS) technology. In order to make the material cheaper and more diverse, PA6 is the most preferable material. In this work, a new PA6/SiO 2 composite microsphere used for SLS was designed and fabricated. To construct the material, PA6 porous microspheres with diameters of 20-80 µm and a certain pore volume were firstly prepared by the dissolution precipitation method. Then, SiO 2 was generated in situ in the PA6 porous microsphere framework, thus achieving a special structured PA6/SiO 2 composite microsphere. These microspheres with much well dispersed SiO 2 in PA6 matrices formed a powder with high bulk density and good electron conductivity. The particle size and weight fraction of the two components can be well controlled by adjusting the experimental conditions. Differential scanning calorimetry (DSC) data showed that the composite powder had a larger sintering window, which would be beneficial for SLS processing. The introduction of SiO 2 reduced the rate of water absorption in the composite powder, which could improve the accuracy of SLS forming. This work has certain significance as a reference for the design and development of SLS polymer-based composite materials.

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The effect of the interface structure of different surface‐modified nano‐SiO₂ on the mechanical properties of nylon 66 composites

Cited by 44 publications

References 22 publications

The effect of surface functional groups of nanosilica on the properties of polyamide 6/SiO₂ nanocomposite

The effect of surface functional groups of nanosilica on the properties of polyamide 6/SiO₂ nanocomposite

Crystallization in Polymer Nanocomposites

Preparation and characterization of novel PA6/SiO2 composite microsphere applied for selective laser sintering

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The effect of the interface structure of different surface‐modified nano‐SiO2 on the mechanical properties of nylon 66 composites

Cited by 44 publications

References 22 publications

The effect of surface functional groups of nanosilica on the properties of polyamide 6/SiO2 nanocomposite

The effect of surface functional groups of nanosilica on the properties of polyamide 6/SiO2 nanocomposite

Crystallization in Polymer Nanocomposites

Preparation and characterization of novel PA6/SiO2 composite microsphere applied for selective laser sintering

Contact Info

Product

Resources

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The effect of the interface structure of different surface‐modified nano‐SiO₂ on the mechanical properties of nylon 66 composites

The effect of surface functional groups of nanosilica on the properties of polyamide 6/SiO₂ nanocomposite

The effect of surface functional groups of nanosilica on the properties of polyamide 6/SiO₂ nanocomposite