Intercalation and exfoliation behaviour of clay layers in branched polyol and polyurethane/clay nanocomposites

2006 ◽  
Vol 55 (2) ◽  
pp. 229-235 ◽  
Author(s):  
Hesheng Xia ◽  
Mo Song
Keyword(s):  
Clay Nanocomposites ◽  
Clay Layers

Preparation and Characterization of Ionic Liquild Modified Clay and its Application in Polypropylene/Clay Nanocomposites

2011 ◽  
Vol 55-57 ◽  
pp. 1588-1592
Author(s):  
Li Mei Wang
Keyword(s):  
Clay Nanocomposites ◽  
X Ray Diffraction ◽  
Modified Clay ◽  
Solution Blending ◽  
Organically Modified ◽  
Result Show ◽  
Xrd Patterns ◽  
Clay Layers ◽  
Poly Propylene

Clay was organically modified with one kind of ionic liquild. Organical clay obtained was used to prepare poly(propylene) (PP)/clay nanocomposites by solution blending. Flourier transform infrared (FTIR), wide-angle X-ray diffraction (XRD) and thermogravimetric analysis (TGA) revealed that the ionic liquild was loaded in the galleries of organically modified clay. TGA result show the thermal stability of organically modified clay was superior to clay. XRD patterns indicated that the d-spacing of clay layers increased to 2.96 nm from 1.22 nm of clay. XRD patterns of PP/clay nanocomposites show that clay layers were dispersed in PP matrix by nanometer size.

Tensile Deformation Behaviours of Nylon 6 Based Nanocomposites

2008 ◽  
Vol 47-50 ◽  
pp. 694-697 ◽  
Author(s):  
Szu Hui Lim ◽  
Zhong Zhen Yu ◽  
Yiu Wing Mai
Keyword(s):  
Shear Deformation ◽  
Tensile Deformation ◽  
Deformation Mode ◽  
Tensile Tests ◽  
Nylon 6 ◽  
Clay Nanocomposites ◽  
Volume Strain ◽  
Physical Mechanisms ◽  
Rubber Particles ◽  
Clay Layers

Tensile tests were conducted on nylon 6/clay nanocomposites, with and without POE-g- MA rubber particles, over a range of temperatures below the glass transition and strain rates 10-4 to 10-1 s-1. It was shown that the yield strength varied with temperature and strain rate as the Eyring equation thus providing results on activation energy and activation volume for the physical mechanisms involved in these processes. Additionally, the tensile dilatometric responses indicated that the presence of POE-g-MA rubber particles did not alter the shear deformation mode of neat nylon 6. In contrast, the presence of clay layers changed the tensile yield deformation of nylon 6 from the more deviatoric plasticity to the more dilatational plasticity. In nylon 6/clay/POE-g-MA ternary nanocomposite, the volume strain response showed that POE-g-MA rubber particles promoted shear deformation and clay layers delamination was suppressed at yield.

Effect of Curing Process on Intercalation and Exfoliation Behavior of Epoxy/Clay Nanocomposites

2002 ◽  
Author(s):  
Chunfang Song ◽  
Weiwei Lin ◽  
Qi Wang ◽  
Yiping Qiu
Keyword(s):  
Epoxy Resin ◽  
High Viscosity ◽  
Curing Temperature ◽  
Clay Nanocomposites ◽  
Mechanical Forces ◽  
Curing Conditions ◽  
Diffusion Speed ◽  
Curing Agents ◽  
Clay Layers ◽  
Xrd And Tem

Effects of curing agents, curing conditions, and curing degree on intercalation and exfoliation behavior of epoxy/clay nanocomposites were investigated. Epoxy was cured with five curing agents, DETA, DDM, DMP-30 and two modified amines, with different curing speeds at various temperatures (from low to high). Curing degree and distance between layers of clay were measured by FTIR, XRD and TEM respectively. It was found that it was easy to intercalate clay in epoxy resin, while clay exfoliation in epoxy resin was dependent more on the curing conditions than on curing agents. Under certain curing conditions when curing speed of interlayer epoxy resin is faster than that of extralayer and fully reaches curing, exfoliation easily takes place with all these curing agents and epoxy/clay nanocomposites can be prepared. At the same time, the distance between clay layers increased from 17.5Å to about 100Å. When the curing temperature was too low, diffusion speed of the epoxy resin and the curing agents can influence the clay exfoliation. When the curing temperature was too high, epoxy was cured too rapidly, such that the high viscosity and the resultant mechanical forces will stop the exfoliation process. Only under properly temperatures when the curing speed of the interlayer epoxy is higher than that of the extralayer epoxy can exfoliation take place.

Morphology Properties of Polyurethane/Clay Nanocomposites Base on Palm Oil Polyol Paint

2013 ◽  
Vol 647 ◽  
pp. 701-704 ◽  
Author(s):  
Rihayat Teuku ◽  
Amroel Suryani
Keyword(s):  
Palm Oil ◽  
Thermoplastic Polyurethane ◽  
Ammonium Bromide ◽  
Clay Nanocomposites ◽  
X Ray Diffraction ◽  
Transmission Electron ◽  
Organically Modified ◽  
Cetyl Trimethyl Ammonium ◽  
Clay Layers ◽  
Clay Aggregates

An organically modified clay and a pristine clay were used to prepare biodegradable thermoplastic polyurethane (PU) paint/clay nanocomposites. In this paper, polyurethane paint /clay nanocomposites base on palm oil polyol were prepared by isocyanate, polyol and organoclay (a clay modified with Cetyl trimethyl ammonium Bromide (CTAB) and Octadecylamines (ODA). The morphologies of samples were revealed by transmission electron microscopy (TEM) and Intercalation of PU into clay galleries and crystalline structure of PU were investigated using X-ray diffraction (XRD). The morphology of the resulting composite showed a combination of intercalated and partially exfoliated clay layers with occasional clay aggregates

Biomedical Applications of Clay

2013 ◽  
Vol 66 (11) ◽  
pp. 1315 ◽  
Author(s):  
Wojciech Chrzanowski ◽  
Sally Yunsun Kim ◽  
Ensanya Ali Abou Neel
Keyword(s):  
Drug Delivery ◽  
Tissue Engineering ◽  
Biomedical Applications ◽  
Scientific Community ◽  
Clay Nanocomposites ◽  
Structural Flexibility ◽  
Small Particle Size ◽  
Composition And Structure ◽  
Scope Of Application ◽  
Clay Layers

Traditional applications of clay mineral mainly revolved around cosmetics and industrial products, but their scope of application is continuously expanding into pharmaceutics including drug delivery and tissue engineering. The interest in clays amongst the scientific community has increased dramatically in recent years due to its composition and structure which can be easily modified to serve different purposes. Largely due to structural flexibility and its small particle size, clay nanostructure can be modified to tune rheological and mechanical properties, and can entrap moisture to suit a particular application. Additionally, interest in the synthesis of polymer-clay nanocomposites in tissue engineering is growing as it is cheap, easily available, and environmentally-friendly. The structure of clay allows the interclaysion of different biomolecules between the clay layers. These biomolecules can be released in a controlled manner which can be utilised in drug delivery and cosmetic applications.

SYNTHESIS AND CHARACTERIZATION OF POLY(BUTYL ACRYLATE-CO-METHYL METHACRYLATE)/CLAY NANOCOMPOSITES VIA EMULSION POLYMERIZATION

2006 ◽  
Vol 05 (02n03) ◽  
pp. 291-297 ◽  
Author(s):  
ZHIYI ZHANG ◽  
NING ZHAO ◽  
WEI WEI ◽  
DONG WU ◽  
YUHAN SUN
Keyword(s):  
Methyl Methacrylate ◽  
Emulsion Polymerization ◽  
Butyl Acrylate ◽  
Sodium Dodecyl ◽  
Sodium Dodecyl Benzene Sulfonate ◽  
Clay Nanocomposites ◽  
Scanning Calorimetry ◽  
Transmission Electron ◽  
Dodecyl Benzene Sulfonate ◽  
Clay Layers

Poly(butyl acrylate-co-methyl methacrylate)/clay nanocomposites were synthesized via emulsion polymerization with an emulsifier (sodium dodecyl benzene sulfonate, SDBS), an initiator (ammonium persulate, APS), acrylic acid ester monomer and Na -montmorillonite. It was found that the addition of SDBS and water widened the gap between clay layers and facilitated monomers to penetrate into clay. Through initiator, comonomers were polymerized in the montmorillonite galleries. The structure of extracted nanocomposites was confirmed by XRD, transmission electron microscopy (TEM). Their thermal property and molecule weight were investigated by differential scanning calorimetry (DSC) and gel-penetrate chromatogram (GPC).

Preparation and Characterization of Polypropylene/Clay Nanocomposites

2011 ◽  
Vol 55-57 ◽  
pp. 1584-1587 ◽  
Author(s):  
Li Mei Wang
Keyword(s):  
Xrd Analysis ◽  
Decomposition Temperature ◽  
Clay Nanocomposites ◽  
X Ray Diffraction ◽  
Scanning Calorimetry ◽  
Xrd Pattern ◽  
Solution Blending ◽  
Clay Layers ◽  
Thermal Stability Of

Polypropylene(PP)/clay nanocomposites were prepared by solution blending. The microstructure of PP/clay nanocomposites was studied by wide-angle X-ray diffraction (XRD) analysis. Differential scanning calorimetry (DSC) and thermogravimetric analysis (TGA) were used to investigate thermal properties of PP/clay nanocomposites. XRD pattern prove that clay layers were exfoliated into nanometer size in PP matrix and that α-Phase crystallite was the main crystallite of PP in PP/clay nanocomposites. TGA examinations confirmed that the maximum decomposition temperature of PP/clay nanocomposites was higher than that of neat PP and that the thermal stability of PP/clay nanocomposites rose noticeably. Results of DSC scans showed the crystalliztion temperature of nanocomposites was slightly bigger than that of pure PP due to the efficient nucleating effects of clay layers.

Calculating barrier properties of polymer/clay nanocomposites: Effects of clay layers

Polymer ◽  
2006 ◽  
Vol 47 (8) ◽  
pp. 2904-2910 ◽  
Author(s):  
Bo Xu ◽  
Qiang Zheng ◽  
Yihu Song ◽  
Yonggang Shangguan
Keyword(s):  
Barrier Properties ◽  
Clay Nanocomposites ◽  
Clay Layers
Sign in / Sign up

Export Citation Format

Share Document