This time to achieve complete healing is defined as the reptation
Because ExSil polymers are not covalently crosslinked, molecular diffusion, polymer reptation
and topological interactions are all potential mechanisms for apparent or pseudo-self-healing.
in langmuir polymer monolayers," Soft Matter, vol.
y Meijer H.E.H.: "Rheology and reptation
of linear polymers.
Interestingly, once in the melt, the value of G' for disentangled UHMWPE increases with time: this indicates that the disentangled state is metastable and the chains reptation
in the melt ultimately leads to the thermodynamically stable, fully entangled melt.
(1,2) On the molecular scale, the glass transition involves the onset of long-range coordinated molecular motion, the beginning of reptation
. (2) On the macroscopic scale, the mechanical properties, thermal properties, and electrical properties of the polymers (2-4) abruptly change in the glass transition range.
Polymer mobility through this gel or swollen layer is very high; thus true polymer dissolution starts by chain reptation
into the solvent [26-28].
Lin (National Chiao Tung U., Taiwan) explains how the universal viscoelastic phenomena of nearly monodispersed polymers are explained quantitatively by the Doi-Edwards (repetition) theory and by the extended reptation
theory, which was developed on the framework of the Doi-Edwards theory.
Nanoscale design of snake skin for reptation
locomotions via friction anisotropy.
The increase in modulus is caused by hard domains restricting the reptation
of the soft chains, provided a good interaction takes place between continuous and dispersed phase, to ensure proper stress transfer.
Such species would reduce the surface energy, potentially reducing the wetting of the surface by any subsequent overcoat and reducing the adhesive energy, and could also impede the generation of mechanical linkages across the interface due to polymer reptation
. The high advancing water contact angle of Substrate S1, as described in the section on surface characterization, strongly suggests the presence of low energy species on the commercial finish S1, and explains why careful cleaning and mechanical treatments are required to achieve good adhesion in such cases, even when waterborne PVDF-acrylic hybrid coatings are applied to them.