Influence of Spinline Stress on Release Properties of a Coaxial Controlled Release Device Based on EVA Polymers

Laarhoven, Hans van; Veurink, J.; Kruft, Marc-Anton; Vromans, Herman

doi:10.1023/b:pham.0000045234.70538.29

Cited by 14 publications

(11 citation statements)

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“…For EVA, PE segments in its main chain are relatively regular and can form a microcrystal structure, with weak diffraction peaks at 2θ angles of 21.3° and 23.7° (0.416 and 0.379 nm) in XRD, respectively, corresponding to (110) and (200) planes of PE microcrystal, respectively . The microcrystalline structures of these PE segments were retained in the EVMT/EVA composite.…”

Section: Resultsmentioning

confidence: 99%

Applying vermiculite‐modified polypropylene film to flexible packaging material

et al. 2014

J of Applied Polymer Sci

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This article presents a process for preparing organovermiculite by ball-milling expanded vermiculite (EVMT) in waterbased ethylene vinyl acetate (EVA) latex. In this process, the vermiculite (VMT) is exfoliated to prepare a kind of EVMT/EVA modifying agent, in which EVA serves as both intercalating polymer into VMT and compatibilizer between VMT and polypropylene (PP). During melt blending between EVMT/EVA and PP, shear force exfoliates VMT sheets, dispersing them relatively well in the PP matrix. Compared with raw PP, EVMT-modified cast polypropylene (CPP) are better when EVMT loading ranged from 0.5 to 1.0%, with improvement in both the strength and toughness of the EVMT/EVA-modified CPP film. Specifically, tensile strength was increased by 44-54%, yield stress increased by 26%, stress at break increased by 37-43%, energy at break (toughness) increased by 29-34%, oxygen transmission rate decreased by 6.2-12.9%, the water vapor transmission rate was not significantly affected, the peel bond strength of laminated CPP film increased by 18-27%, and the processability and melt flow index (MFI) of EVMT/EVA/PP composites were improved as well. Increasing MFI attributes facilitated the processing and formation of EVMT/EVA/PP. V C 2014 Wiley Periodicals, Inc. J.Appl. Polym. Sci. 2014, 131, 40954.

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Section: Resultsmentioning

confidence: 99%

Applying vermiculite‐modified polypropylene film to flexible packaging material

et al. 2014

J of Applied Polymer Sci

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“…As regarding to the other properties: the decrease in the degree of crystallinity, proportion of daughter lamellae and melting point, which is accompanied by higher structural orientation, there exist various explanations in the scientific literature. The degree of crystallinity decreases likely due to increased spinline stress (increased drawing force) in the ultralow diameter filaments which may hinder crystallization, as suggested elsewhere . Alternatively, it can be correlated with the balance between shear flow and cooling rate, where on the one hand a high shear rate prevents relaxation of the polymer chains, thus the induction time for crystallization is reduced , while on the other hand, in the shear region the chain segments tend to be more easily locked or frozen through a way in which they are first incorporated due to the higher cooling rate, which, like quasi‐quenching, generates a lower degree of crystallinity .…”

Section: Discussionmentioning

confidence: 94%

Crystalline structure and thermodynamic analysis of ultra‐low diameter VGCF‐polypropylene nanocomposite monofilaments

2014

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Nanocomposites of VGCF reinforced polypropylene monofilaments were created using melt compounding extrusion. The monofilament diameter and VGCF loading were varied to characterize the effects of spinline stress and imposed confinement on material properties, including crystalline structure and thermodynamic behavior. A correlation was found between spinline stress, degree of confinement, depression of the melting temperature, and changes in crystallite dimensions and orientation. POLYM. COMPOS., 37:1641–1649, 2016. © 2014 Society of Plastics Engineers

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“…In addition, both weak peaks at 2 θ = 21.3° and 23.6° corresponded to d (110) and d (200) of EVA in EVMT/EVA nanocomposites. Although it is well‐known that EVA is an amorphous polymer, but there is microcrystalline structure caused by more regular polyethylene chain segment in main chain of EVA .…”

Section: Resultsmentioning

confidence: 99%

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

et al. 2014

Polymer Composites

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A process for preparing expanded vermiculite/ethylene vinyl acetate nanocomposites by ball milling expanded vermiculite (EVMT) in cyclohexane solution of ethylene vinyl acetate copolymer resin (EVA) was presented, and the influence of EVA/EVMT nanocomposites on mechanical, barrier performance of modified biaxially oriented polypropylene (BOPP) films was discussed in this article. By the process, the EVMT is intercalated and exfoliated to obtain a kind of EVMT/EVA nanocomposite, in which EVA serves as both intercalating agent into EVMT and compatibilizer between EVMT and polypropylene (PP); so, when EVMT/EVA was melt blended with PP, platelets of vermiculite can be exfoliated easily and dispersed relatively well in the PP matrix. Compared with original (nonmodified) BOPP, when EVMT loading ranged from 0.1% to 0.5%, both strength and toughness of the modified BOPP films was increased. Moreover, platelets (flakes) of vermiculite dispersed in PP matrix improved barrier properties of modified BOPP films also. The improved barrier properties of BOPP films accorded with Nielsen model. POLYM. COMPOS., 36:78-87,

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Influence of Spinline Stress on Release Properties of a Coaxial Controlled Release Device Based on EVA Polymers

Abstract: It is demonstrated that the extrusion parameters and spinline stress have a significant influence on the polymeric structure of the membrane and hence the release properties. Higher spinline stress results in a higher release rate.

Cited by 14 publications

References 1 publication

Applying vermiculite‐modified polypropylene film to flexible packaging material

Applying vermiculite‐modified polypropylene film to flexible packaging material

Crystalline structure and thermodynamic analysis of ultra‐low diameter VGCF‐polypropylene nanocomposite monofilaments

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

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