Montmorillonite-based nanocomposites of polybenzoxazole: Synthesis and characterization (I)

Chang, Jin‐Hae; Park, Daekeun; Ihn, Kyo Jin

doi:10.1002/1099-0488(20010301)39:5<471::aid-polb1020>3.0.co;2-6

Cited by 43 publications

(37 citation statements)

References 17 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…For high clay concentrations (1.5 and 3 wt%), however, some of the clays were well dispersed in the PVAPVP (60:40) hydrogel matrix as intercalated, and some of them were agglomerated as seen in Figure 7 (c and d) and Scheme 2. From these results, we can conclude that, the agglomerated structures forms and becomes denser in the PVA/PVP polymer matrix of high clay concentration than that of low concentration (32)(33)(34). …”

Section: Transmission Electron Microscope (Tem)supporting

confidence: 82%

Preparation and Characterization of Poly Vinyl Alcohol/Poly Vinyl Pyrrolidone/Clay Based Nanocomposite by Gamma Irradiation

El‐Arnaouty

Eid

Salah

et al. 2012

Journal of Macromolecular Science, Part A

View full text Add to dashboard Cite

A series of PVA/PVP/clay nanocomposite were prepared by gamma irradiation with different clay contents of (0.15, 0.3, 1, 1.5, 3 and 5 wt%). The gelation content and swelling behavior were investigated. The morphology and structure of PVA/PVP/clay nanocomposite and dispersion of the clay nanoparticles in the polymeric matrix were examined by infrared spectroscopy (FT-IR) and scanning electron microscopy (SEM). The introduction of clay into polymeric matrix was investigated by X-ray diffraction pattern (XRD) and Transmission electron microscope (TEM). It is observed that, the increase of the clay content causes a decrease in the swelling percent. The thermal stability studies confirmed that the introduction of clay lead to an increase in the thermal stability. The TEM results showed that the clay nanoparticles are interchelated or exfoliated in the polymeric matrix. Some desirable characteristics such as relatively good swelling and excellent barrier capability against microbe penetration suggested that PVA/PVP/clay nanocomposite can be a good candidate as a wound dressing.

show abstract

Section: Transmission Electron Microscope (Tem)supporting

confidence: 82%

Preparation and Characterization of Poly Vinyl Alcohol/Poly Vinyl Pyrrolidone/Clay Based Nanocomposite by Gamma Irradiation

El‐Arnaouty

Eid

Salah

et al. 2012

Journal of Macromolecular Science, Part A

View full text Add to dashboard Cite

show abstract

“…Five grams of clay was added to 100 ml distilled water and agitated for 18 ks on a roller table. Samples of 1.5 g PEG4000 and 1.5 g PEG35 000 were added together to the suspension, which was mixed for a further 18 ks, a period typically used in preparing such composites [26][27][28] and then dried in an oven at 60 C for 86 ks. This procedure was applied to the as-received clay and the clays heat-treated at 600 C, 700 C, 750 C and 800 C.…”

Section: Preparation Of Polyethylene Glycol-clay Compositesmentioning

confidence: 99%

On the thermodynamic driving force for polymer intercalation in smectite clays

Chen¹,

Evans²

2005

Philosophical Magazine

View full text Add to dashboard Cite

The view that the intercalation of a polymer in an unmodified smectite clay is driven by the entropic increase that results from displacement of adsorbed water is re-assessed in the light of experiments that show rapid melt intercalation into a clay that has been heat-treated to remove gallery water. Dehydrated smectite clays with collapsed layers take up poly(ethylene glycol) from the melt in only 1 ks or from aqueous solution in under 18 ks, re-establishing the basal plane spacing to that for intercalation in untreated clay, 1.8 nm. Differential scanning calorimetry showed that the intercalation of poly(ethylene glycol) into montmorillonite is exothermic with an enthalpy change of À153 J g À1 based on the intercalated polymer and the heat of wetting for the internal surfaces of montmorillonite by poly(ethylene glycol) is À0.08 J m À2 . These results confirm the observation of re-expansion of heattreated clays and imply that the reduction in free energy on intercalation results from a significant enthalpic change as well as an entropic change for clays with interlayer water, and primarily from an enthalpic change for clay in the absence of water.

show abstract

“…This may be due to the agglomeration of MMT as observed by several previous studies. [24][25][26] Figure 4 shows the effect of CTAB modification of MMT on flexural strength of the kenaf-unsaturated polyester composites. Overall, the trend is similar to those without CTAB modification ( Figure 3).…”

Section: Resultsmentioning

confidence: 99%

Ultra-Violet Radiation-Cured Biofiber Composites from Kenaf: The Effect of Montmorillonite on the Flexural and Impact Properties

Rozman

Rozyanty

Musa

et al. 2010

Journal of Wood Chemistry and Technology

View full text Add to dashboard Cite

Biofiber composites, cured by ultra-violet (UV) radiation were produced using kenaf fibers as the reinforcing agent and unsaturated polyester as the matrix. This research work focused on the effects of the incorporation of kenaf fiber, montmorillonite (MMT), and cetyl trimethyl ammonium bromide-modified MMT (CTAB-MMT) in the unsaturated polyester composite. Overall, the incorporation of kenaf fibers in the form of mat had improved the flexural and impact properties of the composites. Addition of MMT into the kenaf fiber-polyester system showed an improvement up to 1% MMT after which it decreased. The increase was attributed to better stress transfer mechanism in the matrix. However, further increase in the MMT loading had resulted in the decrease in the properties, which was believed to be due to agglomeration. Modification of MMT with CTAB had produced composites with higher flexural and impact properties as compared to those without modification. This was attributed to a combination of effective dispersion of MMT in the matrix, availability of effective high aspect ratio MMT, and enhanced compatibility between CTAB-MMT with the matrix.

show abstract

Montmorillonite-based nanocomposites of polybenzoxazole: Synthesis and characterization (I)

Cited by 43 publications

References 17 publications

Preparation and Characterization of Poly Vinyl Alcohol/Poly Vinyl Pyrrolidone/Clay Based Nanocomposite by Gamma Irradiation

Preparation and Characterization of Poly Vinyl Alcohol/Poly Vinyl Pyrrolidone/Clay Based Nanocomposite by Gamma Irradiation

On the thermodynamic driving force for polymer intercalation in smectite clays

Ultra-Violet Radiation-Cured Biofiber Composites from Kenaf: The Effect of Montmorillonite on the Flexural and Impact Properties

Contact Info

Product

Resources

About