The Entanglement Plateau in the Dynamic Modulus of Rubbery Styrene—Diene Block Copolymers. Significance to Pressure-Sensitive Adhesive Formulations

Autor:	K. W. Rollmann, Gerard Kraus
Rok vydání:	1979
Předmět:	Materials science Polymers and Plastics Plasticizer Modulus General Chemistry Diluent Surfaces Coatings and Films Styrene chemistry.chemical_compound chemistry Dynamic modulus Materials Chemistry Copolymer Polystyrene Adhesive Composite material
Zdroj:	Rubber Chemistry and Technology. 52:278-285
ISSN:	1943-4804 0035-9475
DOI:	10.5254/1.3535217
Popis:	Styrene-diene (butadiene or isoprene) block copolymers of the SDS or (SD−)x type exhibit a plateau in the dynamic storage modulus located between the glass transitions of the polydiene and polystyrene domains. When the polydiene is the continuous phase, the height of this plateau can be estimated with good success from the entanglement spacing molecular weight of the polydiene and the filler effect of the polystyrene domains. The effect of introduction of a center block-compatible diluent can also be calculated, although the simple procedure used here tends to underestimate the plasticizer effect, particularly at high diluent concentration. Nevertheless, the calculation furnishes a useful criterion of compatibility of the polydiene center blocks and low molecular weight resins used commonly as tackifiers in pressure-sensitive adhesives. Center block compatibility is essential for the development of tack in these compositions.
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_dedup___::185e3a4ae23ad1122a18edb7158ea626 https://doi.org/10.5254/1.3535217 Zobrazit plný text záznamu