Effects of energy dissipation on t‐peel strength of plastic ethylene copolymer adhesives

Yamakawa, Shinzo; Tsuru, S.

doi:10.1002/pol.1980.180180816

Cited by 18 publications

(16 citation statements)

References 13 publications

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“…Many previous MD simulations did not find precursor states near the growth front, 28,29,45,46 or the evidence is not so clear. 47 The precursor layer is very thin, and the segments are changing very fast.…”

Section: Resultsmentioning

confidence: 85%

Growth Pathway and Precursor States in Single Lamellar Crystallization: MD Simulations

2011

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Section: Resultsmentioning

confidence: 85%

Growth Pathway and Precursor States in Single Lamellar Crystallization: MD Simulations

2011

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“…5 where it may be seen that the slope of the beam is zero not at the peel front, but at a distance 2h ahead of the peel front, and 0o > 0 °. Thus, using (17) and (18), Eqn. (23) becomes 0o = ½(4~u)" ko.…”

Section: Root Rotation At the Peel Frontmentioning

confidence: 99%

The peeling of flexible laminates

1994

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The present work has defined an adhesive fracture energy G,~ for the peel testing of flexible laminates. The value of G~ characterises the fracture of the laminate and is considered to be a 'geometry-independent' parameter which reflects (i) the energy to break the interracial bonding forces and (ii) the energy dissipated locally ahead of the peel front in the plastic or viscoelastic zone. We have shown that in order to determine this true adhesive fracture energy G~ that the following energy terms must be considered: (i) the stored strain-energy in the peeling arm, (ii) the energy dissipated during tensile deformation of the peeling arm, and (iii) the energy dissipated due to bending of the peeling arm. The analysis proposed yields quantitative expressions for these various energy dissipation terms and, in particular, considers the energy dissipated due to bending of the peeling arm. Another important feature of the analysis is the modelling of the region below the peel front as an elastic beam on an elastic foundation; such that the peeling arm does not act as a truly built-in beam and root rotation at the peel front is allowed. The analysis described in the present paper has been employed for four different laminates. The values of the local angle 00 at the peel front from the theoretical calculations have been shown to be in excellent agreement with the experimentally measured values; a small-scale peel test rig having been built so that the peel test, as a function of applied peel angle 0, thickness h of peeling arm and rate of test, could be observed and photographed using a stereo-optical microscope. The value of the adhesive fracture energy Ga (i.e. the 'fully corrected' value) for each laminate is indeed shown to be a 'material parameter'.

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“…Many pioneering studies have been reported on the primary nucleation, 14-23 the growth of chain-folded lamellae, [24][25][26][27][28][29][30][31] and crystallization under flow or large deformation. Many pioneering studies have been reported on the primary nucleation, 14-23 the growth of chain-folded lamellae, [24][25][26][27][28][29][30][31] and crystallization under flow or large deformation.…”

Section: Introductionmentioning

confidence: 99%

“…[32][33][34][35][36][37] We also find recent uses of supercomputers in studying such extremely slow dynamics as polymer crystallization. 26 In our latest studies, 25,26 we considered crystallization in a system of 64 000 atoms, 640 polyethylene-like chains made of 100 carbons C 100 , freely suspended between crystalline substrates that model the ͕110͖ surfaces of polyethylene. 26 In our latest studies, 25,26 we considered crystallization in a system of 64 000 atoms, 640 polyethylene-like chains made of 100 carbons C 100 , freely suspended between crystalline substrates that model the ͕110͖ surfaces of polyethylene.…”

Section: Introductionmentioning

confidence: 99%

Molecular dynamics simulations of steady-state crystal growth and homogeneous nucleation in polyethylene-like polymer

Yamamoto

2008

The Journal of Chemical Physics

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Molecular mechanisms of crystal growth and homogeneous nucleation from the melt of polyethylene-like linear polymer are investigated by molecular dynamics simulations. The present paper is aimed at extending our previous work with respect to the system size and the boundary condition, thereby enabling detailed studies on the structures of sufficiently large lamellae and fully equilibrated melt. Lamellae of uniform thickness but with marked tapered edges are found to grow at constant velocity from the substrate. Three-dimensional shape of the growing lamellae exhibits peculiar undulation at the growth front, the origin of which is suggested to be the inhomogeneous thickness distribution within the lamellae. Trajectories of chains crystallizing onto the growth front reveal an unexpected pathway for chain folding, where a partially attached chain stem forms a new fold by plunging its head back into a neighboring stem position through slithering snake motions of the chain. Detailed statistics of folds and cilia show that the folds are rather neat and mostly make re-entries into the nearest or the second or third nearest neighboring stem positions, whereas the cilia are generally short but with a small number of longer cilia forming thick amorphous layers. Structure of supercooled melt investigated versus temperature reveals that, at moderate degree of supercooling, the overall chain conformation remains Gaussian random coil but the persistent length of chains increases monotonically with increasing supercooling. Exceptions are at the largest supercooling where homogeneous nucleation takes place; usual melt structure becomes rapidly unstable and emerges many crystallites of random orientations. During early 10-20 ns after the quench, density of melt, radius of gyration of chains, and fraction of kinked bonds show marked alterations. These structural changes are highly cooperative and are considered simply due to the emergence of many embryonic crystals in the melt. Conformations of the chains forming nuclei are also traced to reveal that the homogeneous nuclei are fringed micelle like aggregates of chains, but the chains as a whole have folded conformations, which are similar to those reported in previous simulations on a single polyethylene in a vacuum.

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Effects of energy dissipation on t‐peel strength of plastic ethylene copolymer adhesives

Cited by 18 publications

References 13 publications

Growth Pathway and Precursor States in Single Lamellar Crystallization: MD Simulations

Growth Pathway and Precursor States in Single Lamellar Crystallization: MD Simulations

The peeling of flexible laminates

Molecular dynamics simulations of steady-state crystal growth and homogeneous nucleation in polyethylene-like polymer

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