Modified organophilic montmorillonites/LDPE nanocomposites

Peila, Roberta; Lengvinaite, S.; Malucelli, Giulio; Priola, Aldo; Ronchetti, Silvia Maria

doi:10.1007/s10973-007-8359-2

Cited by 20 publications

(4 citation statements)

References 17 publications

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“…When the NCs were analyzed by differential scanning calorimetry, both the melting temperature (92.3°C for PEMA–Zn and 90.2°C for PEMA–Li) and the crystallinity (14% for PEMA–Zn and 12% for PEMA–Li) were slightly below those of pure polyethylene. Moreover, they did not change when the nanoclay was added; this indicated that the main characteristics of the crystalline phase were similar in the neat ionomer and in the NCs, as has been previously seen in polyethylene matrices 52, 53. A peak appeared in the first heating scan of the ionomers (at 47.3°C for PEMA–Zn and 50.3°C for PEMA–Li), which was indicative of the presence of ionic clusters.…”

Section: Resultssupporting

confidence: 67%

Structure and properties of polyethylene ionomer based nanocomposites

Santamaría

Eguiazábal

Nazábal

2010

J of Applied Polymer Sci

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Li and Zn ionomers of poly(ethylene-comethacrylic acid) were modified by two organically modified montmorillonites by melt mixing. In the nanocomposites (NCs), the increase in the loss tangent main peak temperature indicated a reduction in the mobility of the long-chain segments containing neutralized acid groups. The stack compaction observed by wide-angle X-ray scattering and transmission electron microscopy in the Cloisite 30B based NCs was attributed to the partial degradation of the surfactant and to the irreversible character of the ionexchange process of the ammonium cation of the surfactant with the Li cation. The considerable dispersion that occurred in the poly(ethylene-co-methacrylic acid) zinc salt (PEMAZn)/Cloisite 20A (20A) NCs was attributed to the high volume of the surfactant, which reduced undesired interactions between the inorganic clay surface and the ionomer. The ductile nature of the matrix remained in all of the NCs, and the increase in the modulus of elasticity of the PEMA-Zn/ 20A NCs reached a value five times greater than that of the PEMA-Zn matrix. The results suggest that this ionomer is suitable for use both as a matrix for 20A NCs and as a compatibilizer of polyolefin-based NCs with 20A.

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Section: Resultssupporting

confidence: 67%

Structure and properties of polyethylene ionomer based nanocomposites

Santamaría

Eguiazábal

Nazábal

2010

J of Applied Polymer Sci

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“…Commercially available organic-modified nanoclay (Cloisite 30B) was obtained from Southern Clay Product Inc. The cloisite 30B contains the alkyl ammonium ion and was modified by interaction with additives bearing C12-C18 alkyl chains, which is more compatible toward polymer matrix (Peila et al , 2008). Tetrapod-like zinc oxide (T-ZnO) was supplied by Chengdu Jingyu TEC.…”

Section: Methodsmentioning

confidence: 99%

Shape memory polymer composite coatings with enhanced mechanical and antimicrobial properties

Wang

Zhou

et al. 2018

PRT

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Purpose This paper aims to exploit shape memory polymer (SMP) composite as multifunctional coatings for protecting substrates from surface wear and bacterial. The efficiency of added nano or micro-sized particles in enhancing the properties of SMP was investigated. This study also attempts to use a low-cost and effective spraying approach to fabricate the coatings. The coatings are expected to have good conformability with the substrate and deliver multi-functional performance, such as wrinkle free, wear resistance, thermal stability and antimicrobial property. Design/methodology/approach High-performance SMP composite coatings or thin films were fabricated by a home-made continuous spray-deposition system. The morphologies of the coatings were studied using the scanning electron microscope and the transmission electron microscope. The abrasion properties were evaluated by Taber Abraser test, and thermo-gravimetric analysis was carried out to investigate the thermal properties of prepared composites. The antimicrobial property was determined by the inhibition zone method using E. coli. The thermally responsive shape memory effect of the resulting composites was also characterized. Findings The morphology analysis indicated that the nanoclay was distributed on the surface of the coating which resulted in a significant improvement of the wear property. The wear resistance of the coatings with nanoclay was improved as much as 40 per cent compared with that of the control sample. The thermo-gravimetric analysis revealed that the weight loss rate of composites with nanoclay was dropped over 40 per cent. The SMP coating with zinc oxide (ZnO) showed excellent antimicrobial effect. The shape recovery effect of SMP/nanoclay and SMP/ZnO composites can be triggered by external heating and the composites can reach a full shape recovery within 60 s. Research limitations/implications This study proposed a continuous spray-deposition fabrication of SMP composite coatings, which provides a new avenue to prepare novel multi-functional coatings with low cost. Originality/value Most studies have emphasized on the sole property of SMP composites. Herein, a novel SMP composite coating which could deliver multi-functionality such as wrinkle free, wear resistance, thermal stability and antimicrobial property was proposed.

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“…The weight loss values in nitrogen atmosphere for PEN2 samples were 0.8% and 1.1% after duration of 200 and 500 h, respectively. Organoclays significantly increase air thermal stability of PNCs [13]. Reinforcement of nanoclay in polymer matrix retards the thermal degradation due to the impediment of heat diffusion by silicate layers of nanoclay [14].…”

Section: Isothermal Agingmentioning

confidence: 99%

Correlation in Morphology and Thermal Behavior of Nanoclay-reinforced Polyetherimide Nanocomposites

Dwivedi

Alam

Ghosh

2010

Journal of Thermoplastic Composite Materials

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Organoclay (Cloisite 30B)-reinforced polyetherimide (PEI) and pristine nanoclay (K10)-reinforced PEI nanocomposite films were made by solution casting process with 0.5, 1.0, 2.0, and 3.0 wt% values of nanoclay. Scanning electron micrographs showed that Cloisite 30B was uniformly dispersed in PEI/Cloisite 30B nanocomposites. Glass transition temperature (Tg) of PEI/Cloisite 30B nanocomposites was observed to be higher than those of neat PEI and PEI/K10 nanocomposites. Tg remained unchanged for all wt% values of Cloisite 30B, whereas Tg of PEI/K10 kept on reducing with increasing values of the content of K10. Wide angle X-ray diffraction and transmission electron micrographs showed intercalation and exfoliation, of Cloisite 30B, which restricted the diffusion of heat through silicate layers to achieve high thermal stability of PEI/Cloisite 30B nanocomposites over PEI/K10 nanocomposites in thermogravimetric analysis and isothermal aging.

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Modified organophilic montmorillonites/LDPE nanocomposites

Cited by 20 publications

References 17 publications

Structure and properties of polyethylene ionomer based nanocomposites

Structure and properties of polyethylene ionomer based nanocomposites

Shape memory polymer composite coatings with enhanced mechanical and antimicrobial properties

Correlation in Morphology and Thermal Behavior of Nanoclay-reinforced Polyetherimide Nanocomposites

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