01997nas a2200229 4500008004100000022001400041245007300055210006900128260005700197300001200254490000700266520118700273653002201460653001501482653003301497653003101530653003701561100002001598700001901618700002101637856010901658 2009 eng d a0170-083900aPolypropylene-organoclay nanocomposites containing nucleating agents0 aPolypropyleneorganoclay nanocomposites containing nucleating age a233 SPRING ST, NEW YORK, NY 10013 USAbSPRINGERcDEC a897-9090 v633 a
Polypropylene/organoclay nanocomposites containing nucleating agents, viz., aluminum hydroxybis[2,2-methylenebis(4,6-di-tert-butylphenyl) phosphate (NA21) and 1,3:2,4-bis(3,4-dimethylbenzylidene)sorbitol (Millad 3988), were prepared by direct melt intercalation in a twin-screw extruder. Nucleating agents were added to polypropylene during compounding and their effect on the properties of the nanocomposites was studied. X-ray diffraction (XRD) and transmission electron microscopy (TEM) exhibited clay layers to be intercalated and partially exfoliated. The expansion of inter-gallery distance of the clay layers was governed by the interaction between polypropylene, compatibilizer, and different nucleating agents. Thermogravimetric analysis (TGA) and differential scanning calorimetry (DSC) indicated higher thermal stability and crystallization temperature for nanocomposites compared to virgin polymer. Even a small addition of the nanoscale filler with 0.2% nucleating agents was found to promote concurrently several PP material properties, including improved tensile characteristics, higher Young's modulus, increased thermal stability and rate of crystallization.
10aNucleating agents10aorganoclay10aPolypropylene nanocomposites10aThermogravimetric analysis10atransmission electron microscopy1 aGhugare, S., V.1 aGovindaiah, P.1 aAvadhani, C., V. uhttp://library.ncl.res.in/content/polypropylene-organoclay-nanocomposites-containing-nucleating-agents-0