Experimental and self-consistent-field theoretical study of styrene block copolymer self-adhesive materials

Daoulas, KCh; Theodorou, DN; Roos, A; Creton, C

dc.contributor.author	Daoulas, KCh	en
dc.contributor.author	Theodorou, DN	en
dc.contributor.author	Roos, A	en
dc.contributor.author	Creton, C	en
dc.date.accessioned	2014-03-01T01:20:27Z
dc.date.available	2014-03-01T01:20:27Z
dc.date.issued	2004	en
dc.identifier.issn	0024-9297	en
dc.identifier.uri	https://dspace.lib.ntua.gr/xmlui/handle/123456789/15928
dc.subject	Block Copolymer	en
dc.subject	Self Consistent Field	en
dc.subject.classification	Polymer Science	en
dc.subject.other	Adhesives	en
dc.subject.other	Atomic force microscopy	en
dc.subject.other	Computer simulation	en
dc.subject.other	Elastic moduli	en
dc.subject.other	Morphology	en
dc.subject.other	Strain	en
dc.subject.other	Stresses	en
dc.subject.other	Styrene	en
dc.subject.other	Tensile testing	en
dc.subject.other	X ray scattering	en
dc.subject.other	Bridging properties	en
dc.subject.other	Self adhesive materials	en
dc.subject.other	Stress strain curves	en
dc.subject.other	Tensile measurements	en
dc.subject.other	Block copolymers	en
dc.title	Experimental and self-consistent-field theoretical study of styrene block copolymer self-adhesive materials	en
heal.type	journalArticle	en
heal.identifier.primary	10.1021/ma035383a	en
heal.identifier.secondary	http://dx.doi.org/10.1021/ma035383a	en
heal.language	English	en
heal.publicationDate	2004	en
heal.abstract	This work addresses thermodynamic and mechanical properties of styrene block copolymer (SBC) self-adhesive materials. Mixtures of polystyrene-block-polyisoprene-block-polystyrene (SIS triblock) copolymers with resin and their blends with polystyrene-block-polyisoprene (SI diblock) copolymers were investigated experimentally and theoretically. The experiments involved small-angle X-ray scattering, atomic force microscopy, and tensile measurements, while the theoretical analysis invoked a mesoscopic representation of SBC materials combined with a continuum, 3D real-space self-consistent-field (SCF) approach. The calculations predict that the SBC systems should become microphase separated, with PS-rich spherical domains forming a bcc lattice in SIS triblock/SI diblock blends and in SIS triblock/resin systems with low resin content (20 wt %), while at high (60 wt %) resin content a disordered structure of PS-rich domains is expected. Extensive comparisons of SCF predictions concerning the type and the geometric characteristics of the morphologies obtained, the composition profiles, and the effect of diblock and resin content on the long-range space ordering of the PS-rich domains are performed against the experimental data. SCF theory predicts that approximately 79% of SIS molecules are connecting different PS-rich domains (i.e., are forming bridges) in SIS/SI blends, almost independently of the SI diblock content. The SCF results are combined with a slip tube model of rubber elasticity to predict the elastic behavior of SBC materials. In particular, the bridging properties are used to estimate the PS-rich domain cross-linking contribution, G(c), to the total shear modulus. The entanglement contribution, G(e), is evaluated from experimental and theoretical results reported in the literature concerning the properties of entanglements. The predicted stress-strain curves are in good qualitative agreement with the tensile experimental data for small values of strain.	en
heal.publisher	AMER CHEMICAL SOC	en
heal.journalName	Macromolecules	en
dc.identifier.doi	10.1021/ma035383a	en
dc.identifier.isi	ISI:000222258600046	en
dc.identifier.volume	37	en
dc.identifier.issue	13	en
dc.identifier.spage	5093	en
dc.identifier.epage	5109	en