Study on the compatibility of ethylene‐vinyl acetate copolymer/vermiculite in biaxially oriented polypropylene films

Li, Lidong; Xu, Wencai; Qi, Yujie; Shang, Wei; Fu, Yabo; Liao, Ruijuan

doi:10.1002/pc.22915

Cited by 3 publications

(1 citation statement)

References 40 publications

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“…1 As set forth in the literature, organovermiculite (organo-VMT) can be prepared with the ion-exchange method, with H 1 , 2 alkyl ammonium salt, 3,4 or maleic anhydride. 7,8 Although the EVMT-EVA combination greatly improved the mechanical properties of polypropylene (PP) films, they made less of a contribution to the barrier properties because the aspect ratio of the platelike particles in EVMT-EVA was less than 50. In our previous studies, we used ethylenevinyl acetate copolymer (EVA) as an intercalating agent into expanded vermiculite (EVMT).…”

Section: Introductionmentioning

confidence: 99%

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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Section: Introductionmentioning

confidence: 99%