Time-Dependent Adhesion-Induced Phenomena: Viscoelastic Creep of a Substrate Polymer Over Rigid Particles

Autor:	T. H. Mourey, Jiann H. Chen, L. P. Demejo, R. C. Bowen, Donald S. Rimai
Rok vydání:	1997
Předmět:	chemistry.chemical_classification Materials science Substrate (chemistry) Surfaces and Interfaces General Chemistry Adhesion Polymer Viscoelasticity Surfaces Coatings and Films Creep chemistry Mechanics of Materials Phase (matter) Materials Chemistry Particle Critical radius Composite material
Zdroj:	The Journal of Adhesion. 62:151-168
ISSN:	1545-5823 0021-8464
Popis:	The adhesion of micrometer-size particles to an alternating block copolymer composed of polydimethyisiloxane and polyester was found to be accompanied by substantial viscoelastic flow of the substrate polymer. This flow gave rise to contact radii, which were substantially larger than those predicted by the JKR theory. Moreover, tensile-induced creep of the substrate resulted in anomalously large menisci that actually flowed up several particle heights. The flow of the material occurred over a period of days and, in some instances, the observed contact radii were greater than a critical radius for substantial engulfment of the particles by the substrate. Craters were left behind after particle removal, suggesting plastic-rather than elastic response of the substrate polymer to the surface-force-induced stresses. Size-exclusion chromatography has identified the presence of lower molecular weight polydimethylsiloxane-rich copolymer species in the n-hexane soluble mobile phase responsible for the une...
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_________::6c0e8398fa4841c4a1a79230ebad1e85 https://doi.org/10.1080/00218469708014567 Zobrazit plný text záznamu