Lubrication and slip flow during extrusion of plasticized PVC compounds in the presence of lead stabilizer

Fras, Isabelle; Cassagnau, Philippe; Michel, Alain

doi:10.1016/s0032-3861(98)00339-5

Cited by 10 publications

(4 citation statements)

References 11 publications

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“…Several studies have considered slip in flows of linear polymer melts including high-density polyethylene (HDPE), 2,6,7,[12][13][14]22,24,29,30 linear low-density polyethylene (LLDPE), 3,4 fluoropolymer (FEP), 116,132 polyisoprene (PI), 140 polybutadiene (PBD), 5,[16][17][18]28,31,32,141 polydimethylsiloxane (PDMS), 9,10,142,143 polystyrene (PS), 11,19 polycarbonate (PC), 144 polyisobutylene (PIB), 20,145 polypropylene (PP), 26,94,146,147 poly(ethylene-vinyl) acetate (PEVA), 148 polyvinylchloride (PVC), [149][150][151][152][153] polyethylene-propylene-diene-monomer (EPDM) and other rubbers/elastomers. [33][34][35]152 Regarding the mechanism of slip in the case of polymer melts, everything occurs within the first monolayer of macromolecules adsorbed at the wall as shown in Fig.…”

Section: Polymer Meltsmentioning

confidence: 99%

Slip mechanisms in complex fluid flows

Hatzikiriakos

2015

Soft Matter

114

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The classical no-slip boundary condition of fluid mechanics is not always a valid assumption for the flow of several classes of complex fluids including polymer melts, their blends, polymer solutions, microgels, glasses, suspensions and pastes. In fact, it appears that slip effect in these systems is the rule and not the exemption. The occurrence of slip complicates the analysis of rheological data, although it provides new opportunities to understand their behavior in restricted environments delineating additional molecular mechanisms i.e. entropic restrictions due to limitations in the number of molecular conformations. This article discusses these complexities and provides future research opportunities.

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Section: Polymer Meltsmentioning

confidence: 99%

Slip mechanisms in complex fluid flows

Hatzikiriakos

2015

Soft Matter

114

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“…[16][17][18] Another class of additives is lubricant which reduces the friction either between the polymer chains, leading to a noticeable reduction in viscosity, or between the polymer and hot metal of the processing equipment. 19,20 Also, to lower the compound cost, solid fillers such as CaCO 3 are used which strongly influence the mechanical and dimensional properties (shrinkage) of polymers. 21,22 An enormous amount of work has already been carried out on the effect of additives on various properties of polymers.…”

Section: Introductionmentioning

confidence: 99%

Additives effects on the shrinkage behavior of PVC sheets

Babaluo

2007

J of Applied Polymer Sci

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Despite the unique applications of heat shrinkable PVC sheets in food packaging industry, a few works have been carried out on the shrinkage behavior of this kind of sheets. So, in our work, investigation of the shrinkability of PVC sheets and influence of different parameters on the above-mentioned property has been focused, intensively. This paper presents the results of research aimed at characterizing the shrinkage behavior of PVC sheets, accompanied by the effect of different additives and their weight fractions on the shrinkability of the prepared sheets using experimental design Taguchi method. Also, shrinkage behavior of PVC sheets at optimum conditions has been studied and the stretching and shrinking temperature effects have been investigated. It was found that, among seven investigated variables, plasticizer has the most significant effect on the shrinkability of PVC sheets. Also, at optimum conditions, an increase in the stretching temperature can extensively influence the crystalline structure of the polymer and subsequently, shrinking temperature.

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“…A number of articles have been published on the effects of acrylic‐based processing aids and lubricants on the properties of neat PVC compounds3–7; very few have been for natural fiber‐filled PVC composites 8–9. According to literature, experimental data on the properties of PVC/natural fiber composites incorporated with processing aids and lubricants have not been evidenced.…”

Section: Introductionmentioning

confidence: 99%

Effects of acrylic‐based processing aids on processibility, rheology, thermal and structural stability, and mechanical properties of PVC/wood–sawdust composites

Sombatsompop

Phromchirasuk

2004

J of Applied Polymer Sci

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Methyl methacrylate and ethylacrylate (MMA-co-EA) and methyl methacrylate and butylacrylate (MMA-co-BA) copolymeric processing aids were introduced into poly(vinyl chloride) (PVC)/33.3 wt % wood-sawdust composites containing 0.6 and 2.4 phr of calcium stearate lubricant. The properties of the composites were monitored in terms of processibility, rheology, thermal and structural stability, and mechanical properties. It was found that the mixing torque, wall shear stress, and extrudate swell ratio increased with increasing processing aid content because of increased PVC entanglement. MMA-co-BA (PA20) was found to be more effective than MMA-co-EA (K120 and K130), this being associated with the flexibility of the processing aids, and the dipole-dipole interactions between sawdust particles and polymeric processing aids. The sharkskin characteristic of the composite extrudate at high extrusion rate was moderated by the presence of processing aids. Adding the acrylic-based processing aids and lubricant into PVC/sawdust composites improved the thermal and structural stability of the composites, which were evidenced by an increase in glass transition and decomposition temperatures and a decrease in polyene sequences, respectively. The changes in the mechanical properties of the composites involved a composite homogeneity, which was varied by degree of entanglement and the presence of wood sawdust, and un-reacted processing aids left in the composites.

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Lubrication and slip flow during extrusion of plasticized PVC compounds in the presence of lead stabilizer

Cited by 10 publications

References 11 publications

Slip mechanisms in complex fluid flows

Slip mechanisms in complex fluid flows

Additives effects on the shrinkage behavior of PVC sheets

Effects of acrylic‐based processing aids on processibility, rheology, thermal and structural stability, and mechanical properties of PVC/wood–sawdust composites

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