The influence of filler surface modification on mechanical and material properties of layered double hydroxide‐containing polypropylene composites

Abstract

The processing and properties of layered double hydroxides (LDHs)‐containing polypropylene (PP) composites have been studied extensively. However, no detailed studies have reported on how stearic acid (SA)‐intercalated and SA‐coated LDHs influence the properties of melt‐processed PP/LDH composites. Here, four different types of LDHs: synthesized (cLDH1) and commercial (cLDH2) SA‐coated LDH, SA‐intercalated LDH (iLDH), and unmodified LDH (nLDH), were used to fabricate composites using a master‐batch‐dilution technique in a twin‐screw extruder. The characterization results showed that microcomposites were formed when cLDH2 and nLDH were used, whereas nanocomposites were formed when iLDH and cLDH1 were used. Strong nucleating behavior was observed for the nLDH‐, cLDH1‐, and cLDH2‐containing composites, whereas iLDH delayed the crystallization process of the PP matrix. A significant improvement in modulus, with a balance of tensile and impact strengths, was observed in the case of the cLDH1‐containing composite, whereas the nLDH‐containing composite showed good improvement in temperature‐dependent load‐bearing capacity. On the other hand, the PP/iLDH composite showed a remarkable improvement in thermal stability and a reduction in the peak‐heat‐release rate. Therefore, this study gives us an opportunity to design PP composites with desired properties by the judicious choice of LDH, which further widens the application of PP matrices. © 2017 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2017, 134, 45024.

Development of high bio‐content polypropylene composites with different industrial lignins

“…The measurements were made using approximately 5 mg of the sample under a nitrogen flow of 50 mL/min. The crystallinity of the polyethylene matrix in the composites was determined from the melting endotherm by TA analysis software, based upon a value of 207 J/g for the 100% PP crystalline material heat of fusion . Thermogravimetric analysis was carried out by a thermogravimetric analyzer (TA Instrument Inc. Q500).…”

“…The crystallinity of the polyethylene matrix in the composites was determined from the melting endotherm by TA analysis software, based upon a value of 207 J/g for the 100% PP crystalline material heat of fusion. 40 Thermogravimetric analysis was carried out by a thermogravimetric analyzer (TA Instrument Inc. Q500). The samples were scanned from room temperature to 800°C at a heating rate of 10°C/min in a nitrogen atmosphere.…”

Layered Double Hydroxide‐Based Functional Nanohybrids as Controlled Release Carriers of Pharmaceutically Active Ingredients

“…The LDH crystal structure also contains a positively charged brucite‐like octahedral hydroxide layer, having M 3+ at M 2+ sites, which are electronically neutralized via the water molecules (in hydration shell) of the intercalated anions residing in the left‐over interlayer region and interlayer inorganic anions. Amongst the different kinds of LDHs, having different composition of M 2+ and M 3+ , MgAl‐LDH is generally used as a flame‐retardant and an antacid . MgAl‐LDH intercalated with inorganic carbonate anion (CO 3 2− ) can be changed into MgAl oxide (MAO) via calcinations process at 450–800 °C according to following equation: …”

Filling and coloring effect of pearl shell powder and dye‐loaded pearl shell powder on polypropylene

“…Polypropylene (PP) is a general thermoplastic widely used in various fields, for instance, automotive industry, household appliances, construction materials, packaging, and cable insulation, due to its relatively high mechanical properties, good chemical resistance, easy processability, great recyclability, and low cost . Nevertheless, owing to its intrinsic drawbacks in dimensional and thermal stability, stiffness, strength, and impact toughness, the usefulness of PP as an engineering plastic is still limited .…”

“…Polypropylene (PP) is a general thermoplastic widely used in various fields, for instance, automotive industry, household appliances, construction materials, packaging, and cable insulation, 1 due to its relatively high mechanical properties, good chemical resistance, easy processability, great recyclability, and low cost. 2 Nevertheless, owing to its intrinsic drawbacks in dimensional and thermal stability, stiffness, strength, and impact toughness, the usefulness of PP as an engineering plastic is still limited. 3,4 To further broaden its application, strenuous efforts have been endeavored by the introduction of fillers into PP matrix to develop PP composites with improved performance, such as thermal and electrical characteristics, flame retardancy, color, and mechanical properties.…”