LAUSR.org creates dashboard-style pages of related content for over 1.5 million academic articles. Sign Up to like articles & get recommendations!

Non-isothermal crystallization behavior, rheological properties and morphology of poly(ε-caprolactone)/graphene oxide nanosheets composite films

Photo from wikipedia

Abstract In the present study, the non-isothermal crystallization behavior of solution cast poly(e-caprolactone) (PCL)/graphene oxide (GO) nanocomposite (PCL/GO) films was investigated at a different cooling rate. The loading concentration of… Click to show full abstract

Abstract In the present study, the non-isothermal crystallization behavior of solution cast poly(e-caprolactone) (PCL)/graphene oxide (GO) nanocomposite (PCL/GO) films was investigated at a different cooling rate. The loading concentration of GO (0.25–1% w/w) increased the crystallization temperature (Tc) of PCL matrix at a constant cooling rate. Various model equations were tested to describe the non-isothermal crystallization kinetics of the PCL/GO blend films. The results indicated that the Avrami analysis modified by Jeziorny equation described well the non-isothermal crystallization kinetics of tested samples. The crystallization activation energy was calculated applying the differential isoconversional method of Friedman, and the values ranged between −250 and −100 kJ/mol with an expected decrease of the energy in depending on the quantity of% GO content. Hoffman-Lauritzen secondary nucleation theory parameters, Kg and U* were evaluated using the isoconversional approach of Vyazonvkin and Sbirazuoli, highlighting a shift for the change of regime I/regime II from 305 to 313 K in dependence of GO content. Oscillatory rheology of PCL/GO blends on melt exhibited a transition of liquid-like to solid-like property. The mechanical strength of the blend improved significantly when the GO concentration was maintained at 0.75 wt% or more. The peak height of the AFM confirmed the doping of GO into the PCL matrix.

Keywords: non isothermal; isothermal crystallization; crystallization; pcl; poly caprolactone; crystallization behavior

Journal Title: Thermochimica Acta
Year Published: 2018

Link to full text (if available)


Share on Social Media:                               Sign Up to like & get
recommendations!

Related content

More Information              News              Social Media              Video              Recommended



                Click one of the above tabs to view related content.