Modeling the mechanical properties of highly oriented polymer films: A fiber/gel composite theory approach

Breese, D. Ryan; Beaucage, Gregory

doi:10.1002/polb.21396

Cited by 8 publications

(5 citation statements)

References 47 publications

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“…Of particular interest, the texture of P3 maintained a similar continuous nanofiber morphology even when subjected to 50% strain. This indicates that the nanofibrils can remain continuous and entangled under mechanical strain . Furthermore, the entanglement and interlacing of nanofibers may provide both stronger interactions and/or attractions to impart better ductility characteristics .…”

Section: Resultsmentioning

confidence: 99%

Effects of Molecular Structure and Packing Order on the Stretchability of Semicrystalline Conjugated Poly(Tetrathienoacene‐diketopyrrolopyrrole) Polymers

Lee

et al. 2016

Adv Elect Materials

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there are only a few reports of stretchable polymer electronics. [8,9] Due to high crystallinity and rigid polymer backbone, semiconducting polymers typically exhibit high tensile moduli and a high degree of brittleness, leading to rapid degradation of electrical properties during stretching. [10][11][12] In this regard, maintaining both the charge transport properties and ductility is a challenge for developing polymers for novel stretchable electronic applications. [13,14] π-conjugated polymers, such as polythiophene or donor-acceptor polymers, show high backbone coplanarity and crystalline packing due to their rigid polymer chains and strong π-π interaction. [15] Nevertheless, the presence of large fractions of interconnected crystalline domains in the solid state, a lack of significant chain folding and/or coiling, and high glass transition temperatures contribute to the high tensile moduli of polymer films and make these films too rigid to release the applied stress. In contrast, for polymer thin films containing properly engineered crystalline and amorphous regions, such as polyurethane and elastic polypropylene, the applied stress is preferentially dissipated in the relatively softer amorphous regions. Similar to other reported semicrystallineThe design of polymer semiconductors possessing high charge transport performance, coupled with good ductility, remains a challenge. Understanding the distribution and behavior of both crystalline domains and amorphous regions in conjugated polymer films, upon an applied stress, shall provide general guiding principles to design stretchable organic semiconductors. Structure-property relationships (especially in both side chain and backbone engineering) are investigated for a series of poly(tetrathienoacene-diketopyrrolopyrrole) polymers. It is observed that the fused thiophene diketopyrrolopyrrole-based polymer, when incorporated with branched side chains and an additional thiophene spacer in the backbone, exhibits improved mechanical endurance and, in addition, does not show crack propagation until 40%strain. Furthermore, this polymer exhibits a hole mobility of 0.1 cm 2 V −1 s −1 even at 100% strain or after recovered from strain, which reveals prominent continuity and viscoelasticity of the polymer thin film. It is also observed that the molecular packing orientations (either edge-on or face-on) significantly affect the mechanical compliance of the polymer films. The improved stretchability of the polymers is attributed to both the presence of soft amorphous regions and the intrinsic packing arrangement of its crystalline domains.Recently, polymer-based electronics have shown significant progress in terms of flexibility as well as bendability. [1][2][3][4][5][6][7] However,

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Section: Resultsmentioning

confidence: 99%

Effects of Molecular Structure and Packing Order on the Stretchability of Semicrystalline Conjugated Poly(Tetrathienoacene‐diketopyrrolopyrrole) Polymers

Lee

et al. 2016

Adv Elect Materials

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“…Breese and Beaucage3, 4 gave an overview of older models. Finally, they describe mechanical behavior with a model refining the models of Weeks and Porter5 and Gibson et al6 in the sense that the effects of the orientation process on the modulus of the nonfibrous gel component are incorporated into the model by allowing a transition to fibers.…”

Section: Introductionmentioning

confidence: 99%

Investigation of structural changes in semi‐crystalline polymers during deformation by synchrotron X‐ray scattering

Schneider

2010

J Polym Sci B Polym Phys

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The mechanical behavior of polymer materials is strongly dependent on polymer structure and morphology of the material. The latter is determined mainly by processing and thermal history. Temperature-dependent on-line X-ray scattering during deformation enables the investigation of deformation processes, fatigue and failure of polymers. As an example, investigations on polypropylene are presented. By on-line X-ray scattering with synchrotron radiation, a time resolution in the order of seconds and a spatial resolution in the order of microns can be achieved. The characterization of the crystalline and amorphous phases as well as the study of cavitation processes were performed by simultaneous SAXS and WAXS. The results of scattering experiments are complemented by DSC measurements and SEM investigations. KEYWORDS: mechanical properties; on-line X-ray scattering; polypropylene; SAXS; strain-induced crystallization; structural characterization; WAXS INTRODUCTION The stress-strain curves of semicrystalline materials generally show three characteristic regions. Although the initial region before the yield point apparently behaves elastically, stress relaxation due to rearrangements in the amorphous phase can be observed. The mobility in the amorphous phase depends on the difference between the ambient temperature and the temperature characteristic of the glass transition, which is the dominant relaxation process in the temperature range under investigation. After the yield point, typically local necking occurs with high local strain, whereas the overall strain remains moderate. In the case of dog-bone specimens then the neck propagates over the whole specimen during constant load. In the true stressstrain diagram necking is a fast local deformation from the yield strain to the strain of the fully yielded specimen. In the third step during further elongation strain hardening occurs, until finally the specimen fails.

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“…This kind of structure is very common in semicrystalline polymer films drawn at very large strains. According to other work,20 these fibrous structures could be composed of piled lamellae with a long‐range order or tightly packed extended chains, which are highly oriented in the drawing direction.…”

Section: Resultsmentioning

confidence: 96%

Effect of the Strain Rate and Drawing Temperature on the Mechanical Behavior of EVOH and EVOH Composites

Urquiza¹,

Gámez‐Pérez²,

Velázquez-Infante³

et al. 2012

Adv Polym Technol

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Registro de acceso restringido Este recurso no está disponible en acceso abierto por política de la editorial. No obstante, se puede acceder al texto completo desde la Universitat Jaume I o si el usuario cuenta con suscripción. Registre d'accés restringit Aquest recurs no està disponible en accés obert per política de l'editorial. No obstant això, es pot accedir al text complet des de la Universitat Jaume I o si l'usuari compta amb subscripció. Restricted access item This item isn't open access because of publisher's policy. The full--text version is only available from Jaume I University or if the user has a running suscription to the publisher's contents.

show abstract

Modeling the mechanical properties of highly oriented polymer films: A fiber/gel composite theory approach

Cited by 8 publications

References 47 publications

Effects of Molecular Structure and Packing Order on the Stretchability of Semicrystalline Conjugated Poly(Tetrathienoacene‐diketopyrrolopyrrole) Polymers

Effects of Molecular Structure and Packing Order on the Stretchability of Semicrystalline Conjugated Poly(Tetrathienoacene‐diketopyrrolopyrrole) Polymers

Investigation of structural changes in semi‐crystalline polymers during deformation by synchrotron X‐ray scattering

Effect of the Strain Rate and Drawing Temperature on the Mechanical Behavior of EVOH and EVOH Composites

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