Surface interactions in a shear field

Dietsche, Laura

doi:10.1016/s0301-9322(97)88142-6

Cited by 3 publications

(12 citation statements)

References 1 publication

(1 reference statement)

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“…In light of the preceding, we must conclude that the previous results (Dietsche et al, 1995;David et al, 1995) with hexadecene/hexadecane were indicative of extremely slow near-surface dynamics, orders of magnitude slower than reported in simulations. To confirm those results, we repeated the experiments with C,,'s on the same surface as the PB experiments outlined earlier.…”

Section: Discussionmentioning

confidence: 71%

“…The experimental setup has been described in detail by Dietsche (1993) and David (1994). A brief description, including some minor modifications.…”

Section: Experimental Studiesmentioning

confidence: 99%

“…Previous investigations in our laboratory using attenuated total-reflection infrared spectroscopy (ATR/FTIR) (Dietsche et al, 1995;David et al, 1995) demonstrated the existence of surprisingly-long time scales for the diffusion of linear oligomers (C,,'s) away from a flat surface under mild flow conditions. Although the most marked departure from simple diffusion occurred with hexadecane functionalized by polar groups (carboxylic acids, alcohols, amines), anomalously slow diffusion occurred even in the case of the interdiffusion of hexadecane and 1-hexadecene, which should have weak interactions with the surfaces used in these experiments.…”

Section: Introductionmentioning

confidence: 99%

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Near‐surface dynamics of sheared polymer melts using ATR/FTIR

Wise¹,

Denn²,

Bell³

1998

AIChE Journal

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Using attenuated total-reflectance infiared spectroscopy (A TR/FTIR), the concentration of deuterated polybutadiene near the surface of a flat zinc selenide crystal was followed as it was replaced by ordinary polybutadiene by flow and difision. Experiments were performed in the melt, both below (M -1,500) and aboue (M -15,000) the entanglement threshold. The decay profiles agree well with a finite-element simulation of the system. In contrast to preuious inuestigations of C,,'s, the decay profiles of both unentangled and entangled polybutadienes are consistent with a uniform difisiuity in the near-wall region.

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Section: Discussionmentioning

confidence: 71%

“…The experimental setup has been described in detail by Dietsche (1993) and David (1994). A brief description, including some minor modifications.…”

Section: Experimental Studiesmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Near‐surface dynamics of sheared polymer melts using ATR/FTIR

Wise¹,

Denn²,

Bell³

1998

AIChE Journal

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“…Following the switching of the valve at 4 min there is a rapid decrease in the normalized adsorption of the tag, corresponding to bulk flow and diffusion. There is then a transition (denoted "first break point") to a slower dynamical process; Dietsche et al (1995) referred to this process in the hexadecane/l-hexadecene system as first-order, but for the alcohol/hexadecene system the data in this region are nonlinear on semi- Figure 3. Effect of chemical functionality on dynamical response.…”

Section: Resultsmentioning

confidence: 99%

“…The experimental apparatus, which is essentially the same as that used by Dietsche et al (1995), is shown schematically in Figure 1. The flat surface of a hemicylindrical, half-silvered zinc selenide (ZnSe) IR crystal formed one face of a flow channel machined in a stainless steel block.…”

Section: Methodsmentioning

confidence: 99%

Dynamics of flow-induced surface exchange

David¹,

Denn²,

Bell³

1995

Ind. Eng. Chem. Res.

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Chain-Exchange Dynamics at a Polymer−Solid Interface: Effects of Polydispersity and Shear Stress on Linear Low-Density Polyethylene Flow

Esperidião

2003

Ind. Eng. Chem. Res.

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Polymer-surface interactions in flowing systems were studied using an attenuated total reflectance Fourier transform infrared spectroscopy technique. The absorbance of deuterated polyethylene, d-PE66 (M w ) 6.60 × 10 4 ) and d-PE112 (M w ) 1.12 × 10 5 ), near the surface of a flat zinc selenide crystal was followed as it was replaced by linear low-density polyethylene (M w ) 1.07 × 10 5 ). The experiments were performed under wall stresses of 0.090, 0.134, and 0.155 MPa using a rectangular flow channel formed by a ZnSe crystal and an aluminum block. The decay profiles depended on the molecular weight distribution, the chemical composition distribution, and the shear stress. For d-PE112, the decay profiles suggest that slip is due to a cohesive failure. For d-PE66, the slip mechanism appeared to be due to adhesive failure. For d-PE112 with larger and regular chains, an immobile layer forms whose thickness (12-17 nm) depended on the wall shear stress.

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Surface interactions in a shear field

Cited by 3 publications

References 1 publication

Near‐surface dynamics of sheared polymer melts using ATR/FTIR

Near‐surface dynamics of sheared polymer melts using ATR/FTIR

Dynamics of flow-induced surface exchange

Chain-Exchange Dynamics at a Polymer−Solid Interface: Effects of Polydispersity and Shear Stress on Linear Low-Density Polyethylene Flow

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