2013
DOI: 10.1021/ma400512b
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Thermoplastic Polyurethane Cross-Linked by Functionalized Silica. Nanostructure Evolution under Mechanical Load

Abstract: Composites of TPU (Elastollan 685A by BASF) and 0−0.5 wt % 3-aminopropyltriethoxysilane functionalized silica spheres (diameter 14 nm) are strained and subjected to load cycling. Tests are monitored by SAXS which is analyzed by the chord distribution function (CDF) method. Extensibility of the soft phase is limited. Macroscopic strain is accomplished by failure of single soft domains. Broken entities comprise the overstretched soft domain, sandwiched between two hard domains. Macroscopic strain at failure dete… Show more

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Cited by 24 publications
(35 citation statements)
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“…They are neither narrow nor found in static discrete bands like with the machine‐prepared TPUs. Instead, the CDFs look very similar to those from a previous TPU study of some of us . Also those samples were prepared by the hand casting process.…”
Section: Resultsmentioning
confidence: 57%
See 1 more Smart Citation
“…They are neither narrow nor found in static discrete bands like with the machine‐prepared TPUs. Instead, the CDFs look very similar to those from a previous TPU study of some of us . Also those samples were prepared by the hand casting process.…”
Section: Resultsmentioning
confidence: 57%
“…To capture the nanostructure change quantitatively by means of the long period peak, we track its position and shape during the tensile tests. In previous work on polyurethanes we have done this as well . Figure presents the evolution of the nanoscopic strain ϵ n (ϵ) computed from the most‐frequent long period.…”
Section: Resultsmentioning
confidence: 99%
“…With PUEs frequently an unusual peak movement is found. For " > $ 1 the peak stops moving or it even moves back (Desper et al, 1985;Blundell et al, 2002;Stribeck et al, 2013). With our materials, the long period grows too slowly up to " ' 0:7 and then it stops completely.…”
Section: Resultsmentioning
confidence: 86%
“…This result indicates that for all the investigated materials the discrete SAXS peak (long period) is attributed to scattering entities ('well arranged ensembles'; Stribeck et al, 2013) that correspond to a one-dimensional nearly quasiperiodic morphology. The absence of the corresponding typical diffraction peaks (Merlin et al, 1985;Todd et al, 1986;Dotera, 2012) is attributed to the fact that the effective lengths of the modules in the copolymer are not as uniform as the respective entities in a quasicrystal.…”
Section: Figurementioning
confidence: 73%
“…In our recent research on the nanostructure evolution during the straining of polyurethanes we have already studied the influence of the polyol architecture on the domain structure and its response to the mechanical load . Beyond that the straining mechanisms in several linear TPU have been studied in order to track down the mechanisms of the non‐affine expansion on the nanoscopic scale. In the respective studies, the materials had been hand‐cast.…”
Section: Introductionmentioning
confidence: 99%