Revolution/rotation‐type mixing‐assisted masterbatch process for polypropylene‐based high‐impact ternary nanocomposites

Abstract

Polypropylene (PP)/maleic anhydride grafted poly(styrene-b-ethylene-co-butylene-b-styrene) triblock copolymer (SEBS-g-MA)/halloysite nanotube (HNT) ternary nanocomposites were prepared by two methods: onestep simultaneous melt mixing (SM) of all components; and masterbatch-based melt mixing (MB) involving revolution/rotation-type high shear mixing of a concentrated solution of HNT and SEBS-g-MA, followed by melt blending with PP. Organically modified HNTs (Org-HNTs) with cetyltrimethyl ammonium bromide were prepared via a special cryoscopic expansion/modification technique (C-XP/M). The morphological structures and mechanical properties of the composites, as well as the amount of reinforcer/toughener-compatibilizer (HNT/SEBS-g-MA) at a ratio of 1/3, were discussed as a function of SM and MB techniques. Morphological studies showed that the SM technique revealed microcomposite structures with large aggregates of Org-HNTs in the matrix. In contrast, the MB technique, with the help of elastomeric phase encapsulation, resulted in the best HNT dispersion in the PP matrix, leading to improved mechanical properties. In particular, the PP-based ternary nanocomposite with 3 wt % Org-HNT and 9 wt % SEBS-g-MA prepared by the MB method exhibited 200% higher impact strength compared with PP, attributed to well dispersed, encapsulated, and compatibilized HNTs in the matrix, which created a good balance between stiffness and toughness. POLYM. COMPOS., 00:000-000,

Preparation of high-strength SEBS nanocomposites reinforced with halloysite nanotube: Effect of SEBS-g-MA compatibilizer

“…These distortions may be caused by lyophilization process of the frozen solid water molecules and its replacement by CTAB molecules interacting with the silanol groups present at the ends of the HNTs. 19 As a result of surface modification, it was thought that HNTs with reduced intertubular interactions would exhibit better distribution in the polymer matrix and could establish better interactions with the matrix and compatibilizer. TGA thermograms of pure HNT and Org-HNT clays and their derivative curves (DTG) are presented in Figure 2.…”

“…The nanotubes were modified via C-XP/M method 19 ; 0.1 g CTAB calculated based on the cation exchange capacity of the HNT was dissolved in 40 mL deionized water at 50 C using a magnetic stirrer. Then, 2 g of HNT was added to the CTAB solution and stirred for 3 h. The solution was frozen at À20 C and the frozen solution was placed in the lyophilizer and sublimation of water was performed for 72 h. Finally, dry Org-HNT was obtained and stored in a desiccator.…”

Property enhancement in polypropylene ternary blend nanocomposites via a novel poly(ethylene oxide)‐grafted polystyrene‐block‐poly(ethylene/butylene)‐block‐polystyrene toughener–compatibilizer system

“…SEM analyses of the nanocomposites after tensile and impact tests were performed using ESEM‐FEG and an EDAX XL‐30 microscope (Philips, The Netherlands). Moreover, the cryo‐fractured samples were etched with THF solvent at 60 °C for 30 min to follow SEBS domains dispersed in the nanocomposites …”

“…For this purpose, elastomer‐based compatibilizer–toughener systems have been widely utilized in polypropylene (PP)‐based nanocomposites . In our recent study, maleic anhydride‐grafted polystyrene‐ block ‐poly(ethylene/butylene)‐ block ‐polystyrene (SEBS‐ g ‐MA) elastomeric compatibilizer was used for PP/halloysite nanocomposites . The improvement in toughness with modulus and strength was ascribed to interactions of surface functional groups of clays and MA groups of the elastomer …”

Halloysit Nanotüp Takviyeli Kopoliester Termoplastik Elastomer Kompozitler: Isıl ve Mekanik Özelliklerin İncelenmesi

“…COPE'nin elastik modül değerleri ve sertlikleri HNT içeriği ile doğru orantılı olarak artış sergilemiştir. HNT takviyesi moleküler hareketleri kısıtlayarak malzemenin deformasyona karşı direncini arttırmış ve saf COPE'ye ait 18,9 MPa değerindeki modül değeri 7 phr Org-HNT kullanımıyla yaklaşık % 55'lik bir artış göstererek 29,2 MPa'a ulaşmıştır[12,14,23]. Modüldeki yükselme eğilimi, COPE'nin karbonil grubu ve ester oksijenleriyle, HNT yüzeyindeki silanol grupları arasında kurulan hidrojen bağlarından kaynaklanmış olabilir[9].…”