The effect of halloysite modification combined with in situ matrix modifications on the structure and properties of polypropylene/halloysite nanocomposites

Abstract

The effect of various modifications/intercalations of halloysite and the combination of these modifications with in situ PP matrix modification was investigated with respect to the structure and properties of the polypropylene/halloysite nanocomposites. Hexadecyl-tri-methyl-ammonium-bromide (HEDA), 3-aminopropyltrimethoxysilane and urea were used as the intercalators/modifiers. The best intercalation was found for urea, although an unexpected insignificant impact on the mechanical properties also resulted as a consequence of the urea polarity and the significant decrease in PP crystallinity. However, the simultaneous application of 4,4!-diphenylmethylene dimaleinimide (DBMI) brought about an increase in the mechanical behavior by increasing the halloysite/PP affinity as a result of in situ matrix modification. This effect was further supported by coupling between the PP and halloysite (HNT) in the system containing urea-intercalated HNT. This can be explained by the occurrence of a urea-supported reaction between the imide ring of DBMI and the OH groups of the HNT, which resulted in the best mechanical behaviors achieved in this study

Effect of halloysite on structure and properties of melt-drawn PCL/PLA microfibrillar composites

“…Recently, halloysite nanotubes have been successfully applied to modification of PLA [13,14] and PCL [15,16]; their advantage is dispersion even without organophilization in these polar polymers. In some cases, suitable modifications can enhance HNT efficiency [17,18]. However, the evaluation of the structure-directing potential of HNT in polymer [19][20][21][22][23] is in its infancy stage, especially in comparison with that of oMMT [24][25][26][27].…”

Palladated cyclodextrin and halloysite containing polymer and its carbonized form as efficient hydrogenation catalysts

“…It was found that the presence of Hal could both improve the yield of polymerization and the catalytic activity of the resulting catalyst. According to the literature, this observation can be attributed to the effect of Hal on the resulting polymer . Hence, although Hal is partially destroyed in the course of carbonization, its incorporation was beneficial for achieving the best catalytic activity.…”

Morphological, Thermal and Mechanical Properties of 90/10 (WT %/WT %) PP/ABS Blends and their Polymer Nanocomposites

“…Covalently and non-covalently modification of the HNTs can be done by exploiting the hydroxyl groups which are already present on the surface of HNTs. [37] reported the effect of modification of HNTs by using (hexadecyl tri methyl ammonium bromide) (HEDA), urea. The HNTs was treated in 5% solution of HEDA at 80 ºC for 24 hrs.…”