The current article addresses a new strategy for the preparation of polylactic acid/cellulose nanocrystal(PLA/CNCs)nanobiocomposite films with improved structural morphology,mechanical and barrier properties for food ...The current article addresses a new strategy for the preparation of polylactic acid/cellulose nanocrystal(PLA/CNCs)nanobiocomposite films with improved structural morphology,mechanical and barrier properties for food packaging applications.The addition of hexadecyltrimethylammonium bromide(CTAB)and sodium lauryl sulfate(SLS)as cationic and anionic surfactants respectively,was found to play a crucial role in preventing re-aggregation of the CNCs during drying and improving the dispersion of CNCs in the PLA.The coated paper was characterized using mechanical tests,water vapor permeability(WVP),X-ray diffraction(XRD),scanning electron microscopy(SEM)and air permeability.The results showed that the paper coated with PLA containing 7.5%CNCs and 0.15%CTAB based on weight of PLA,gives the highest measured paper properties,where an increase in tensile strength(+133%),Young’s modulus(+309%),tear index(+183%),burst(+60.8)and a decrease in air permeability(−92%)was obtained.展开更多
In this work,conducting composites of nanocellulose(NC)/polypyrrole nanoparticles(NPPy)and silver nanoparticles(AgNPs),i.e.,NC/NPPyAg,were synthesized for the first time,to the best of our knowledge,via in situ emulsi...In this work,conducting composites of nanocellulose(NC)/polypyrrole nanoparticles(NPPy)and silver nanoparticles(AgNPs),i.e.,NC/NPPyAg,were synthesized for the first time,to the best of our knowledge,via in situ emulsion polymerization of pyrrole in the presence of surfactant dopants.The AgNPs acted as an oxidizing agent to simultaneously incorporate nanoparticles into the prepared composites.The structures and morphologies of the prepared composites were studied using Fourier transform infrared(FTIR)spectroscopy,X-ray diffraction(XRD),UV-Vis Spectra,thermogravimetric analysis(TGA),and scanning and transmission electron microscopy(SEM and TEM)techniques.Additionally,the prepared composites were characterized by their conductivities,and the dielectric constants(e΄),dielectric losses(e˝),and AC conductivities were studied for the prepared composites with an increasing NPPy content as a function of the frequency.展开更多
文摘The current article addresses a new strategy for the preparation of polylactic acid/cellulose nanocrystal(PLA/CNCs)nanobiocomposite films with improved structural morphology,mechanical and barrier properties for food packaging applications.The addition of hexadecyltrimethylammonium bromide(CTAB)and sodium lauryl sulfate(SLS)as cationic and anionic surfactants respectively,was found to play a crucial role in preventing re-aggregation of the CNCs during drying and improving the dispersion of CNCs in the PLA.The coated paper was characterized using mechanical tests,water vapor permeability(WVP),X-ray diffraction(XRD),scanning electron microscopy(SEM)and air permeability.The results showed that the paper coated with PLA containing 7.5%CNCs and 0.15%CTAB based on weight of PLA,gives the highest measured paper properties,where an increase in tensile strength(+133%),Young’s modulus(+309%),tear index(+183%),burst(+60.8)and a decrease in air permeability(−92%)was obtained.
文摘In this work,conducting composites of nanocellulose(NC)/polypyrrole nanoparticles(NPPy)and silver nanoparticles(AgNPs),i.e.,NC/NPPyAg,were synthesized for the first time,to the best of our knowledge,via in situ emulsion polymerization of pyrrole in the presence of surfactant dopants.The AgNPs acted as an oxidizing agent to simultaneously incorporate nanoparticles into the prepared composites.The structures and morphologies of the prepared composites were studied using Fourier transform infrared(FTIR)spectroscopy,X-ray diffraction(XRD),UV-Vis Spectra,thermogravimetric analysis(TGA),and scanning and transmission electron microscopy(SEM and TEM)techniques.Additionally,the prepared composites were characterized by their conductivities,and the dielectric constants(e΄),dielectric losses(e˝),and AC conductivities were studied for the prepared composites with an increasing NPPy content as a function of the frequency.
