Applying vermiculite‐modified polypropylene film to flexible packaging material

Fu, Yabo; Li, Dongli; Xu, Wencai; Qi, Yujie; Shang, Wei; Wu, Weixia; Wang, Yajun

doi:10.1002/app.40954

Cited by 5 publications

(2 citation statements)

References 34 publications

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“…Figure 8a shows that the EV fillers with lamellar have certain degree of order, and it is not necessary to exfoliate vermiculite into single sheets; this is consistent with the literature [32]. The average particle size calculated by Image Pro Plus software was 21.71 μm.…”

Section: Resultssupporting

confidence: 86%

Expanded Vermiculite-Filled Polyurethane Foam-Core Bionic Composites: Preparation and Thermal, Compression, and Dynamic Cushion Properties

Wang

Ren

et al. 2019

Polymers

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In this article, expanded vermiculite (EV)-enhanced polyurethane foam bionic composites inspired by pomelo peel is proposed. The columnar lattice structure mold is employed to constitute the periodic interface structure and gradient foam structure, and the nylon nonwoven fabric is combined as the surface layer. The effects of EV content on the thermal, compression, and dynamic cushion properties of bionic composites are investigated. Results show that residual char increases with EV content, which conduces to decrease the release of heat flow. The proposed bionic composite with columnar lattice structure has optimal compressive modulus, energy absorption and dynamic cushion efficacy when 1 wt% EV is added. However, its performance decreases slowly when EV fillers are continuously added because the cell morphology is changed from round to irregular shape and the interfacial adhesion of filler–matrix is weakened. Owing to their unique bionic structure, composites can absorb 99% of the energy impacted by flat impactor within a smaller deformation and achieve 97% absorption efficiency for a hemispheric impactor in cushion test.

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Section: Resultssupporting

confidence: 86%

Expanded Vermiculite-Filled Polyurethane Foam-Core Bionic Composites: Preparation and Thermal, Compression, and Dynamic Cushion Properties

Wang

Ren

et al. 2019

Polymers

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“…In the literature studies on polyolefins with some titanium dioxide and vermiculite were found . Composites of titanium dioxide with HDPE matrix showed good dispersion and influence on crystallinity, while modified vermiculite in polypropylene (PP) matrix imparted an improvement of mechanical properties …”

Section: Introductionmentioning

confidence: 99%

Permeability, Melt Flow Index, Mechanical, and Morphological Properties of Green HDPE Composites: Effect of Mineral Fillers

Escócio

Visconte

Nazareth

et al. 2018

Macromolecular Symposia

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In this study, two types of composites, both with the same polymeric matrix, high density polyethylene (HDPE) from renewable sources, also called green HDPE, are investigated. The mineral fillers insert into HDPE are vermiculite and titanium dioxide (TIO2). The objective of this work is the evaluation of two inorganic fillers in the HDPE composites and how their presence alters the properties of this HDPE derive from sugar cane ethanol. Composites obtain by extrusion with different contents of anatase type titanium dioxide (10–30 wt%/wt) and brazilian vermiculite (5–20 wt%/wt) are evaluated as for mechanical and morphological properties, melt flow index (MFI), and permeability. The addition of fillers cause little influence on tensile strength, but increased the elasticity modulus and decreased impact strength. in relation to morphology, it is found that particles of TIO2 are well dispersed in the HDPE matrix. For composites with vermiculite, its distribution in the polymer matrix is not so good as compared with composites of TIO2, especially in proportions higher than 10 wt%. The results of MFI show that by adding vermiculite the fluidity of polyethylene does not change, but the addition of TIO2 promotes a reduction in fluidity thus suggesting that a good dispersion has been achieved. Permeability increases on the addition of the two fillers, being more pronounced at high amounts (20% vermiculite and 30% TIO2). The analyzed properties, the addition of these fillers does not interfere negatively the properties of the green HDPE and can be considered an alternative toward low cost composites.

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Influence of nanovermiculites with a high aspect ratio and stretch orientation on the microstructure of polypropylene films

et al. 2015

J of Applied Polymer Sci

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In this article, we present a process for preparing organovermiculites, which consist of expanded vermiculite (EVMT)poly(vinyl alcohol) (PVOH) created by the mechanical ball-milling of EVMT in a PVOH-water solution. We then discusses the influence of EVMT-PVOH on the barrier performance, crystallization behavior, thermal stability, and mechanical properties of modified blown polypropylene (PP) films. EVMT was intercalated and exfoliated by PVOH macromolecules to obtain a kind of hybrid EVMT-PVOH. PVOH served as both an intercalating agent into EVMT and a compatibilizer between EVMT and PP. Compared with the original (unmodified) PP, when the EVMT loading ranged from 0.1 to 2.0%, although the crystallinity decreased for most PP films, the thermal stability and mechanical properties all improved. Moreover, EVMT platelike particles with a high aspect ratio (ca. 550) dispersed in the PP matrix also improved the barrier properties of the modified PP films, which was in accordance with the Nielsen model. EXPERIMENTAL MaterialsThe VMT used in this experiment was EVMT from the Yuli (Weili) Co. Qeganbulak VMT deposit in Xinjiang, China. The EVMT was obtained by the treatment of the natural VMT by quickly going through the channel-type furnace at 11008C. PVOH resin with Elvanol grade 90-50 was purchased from DuPont (Pudong New District, Shanghai, China). PP was purchased from MaoMing SINOPEC (MaoMing, China) with grade F280 (PPH-F-022-A); it was a special PP homopolymer for PP with a melt flow index of 2.8 g/10 min and an isotacticity of 96.5%. Preparation of EVMT-PVOHA certain mass of PVOH was added to water that was heated gently until the PVOH dissolved. The EVMT was crushed in a high-speed pulverizer for 5 min, sieved to get 50-100-mesh EVMT, and mixed with the prepared PVOH-water solution. The mixture was ball-milled at a speed of 2000 rpm in a highspeed ball miller (GJ-28, Qingdao Haitong Special Instrument Co., Ltd., Qingdao City, China) for 30 min. Then, EVMT-PVOH slurry was dried in an oven at 708C for 24 h in a vacuum. The final pellet-form EVMT-PVOH (5:95 wt %) was obtained by cutting and was characterized with XRD. Preparation of the EVMT-PVOH-PP Nanocomposite BlendsThe EVMT-PVOH-PP polymer-matrix composites (nanocomposites) were prepared in a screw extruder [CTE-35, Coperion Keya (Nanjing) Machinery Co., Ltd., China] at 300 rpm. The melt-blending temperature profiles selected were 185, 200, 215, and 2308C. The weight ratios (weight percentage) of EVMT-PVOH to PP were fixed at 0.1, 0.3, 0.5, 1.0, 1.5, and 2.0. The EVMT-PVOH-PP nanocomposites were pelletized and dried at 608C for 3 h. The weight ratios of PP to EVMT to PVOH in the polymer-matrix composite samples 1-7 were 100:0:0, 99.8:0.1:0.1, 99.4:0.3:0.3, 99.0:0.5:0.5, 98.0:1.0:1.0, 97.0:1.5:1.5, and 96.0:2.0:2.0, respectively.

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Applying vermiculite‐modified polypropylene film to flexible packaging material

Cited by 5 publications

References 34 publications

Expanded Vermiculite-Filled Polyurethane Foam-Core Bionic Composites: Preparation and Thermal, Compression, and Dynamic Cushion Properties

Expanded Vermiculite-Filled Polyurethane Foam-Core Bionic Composites: Preparation and Thermal, Compression, and Dynamic Cushion Properties

Permeability, Melt Flow Index, Mechanical, and Morphological Properties of Green HDPE Composites: Effect of Mineral Fillers

Influence of nanovermiculites with a high aspect ratio and stretch orientation on the microstructure of polypropylene films

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