Unimodal and bimodal networks of physically crosslinked polyborodimethylsiloxane: viscoelastic and equibiaxial extension behaviors

Seetapan, Nispa; Fuongfuchat, Asira; Sirikittikul, D.; Limparyoon, Nattawut

doi:10.1007/s10965-013-0183-8

Cited by 29 publications

(40 citation statements)

References 33 publications

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“…Neither its viscosity nor its modulus appears to be much affected by its lack of DC3179's particulate content: its shear modulus even seems to be higher. We did not see the upturn in the out-of-phase modulus at several hundred rad s '( seen in DC3179 -behaviour which Seetapan [10], testing three molecular weights of which one lay below the entanglement value, attributed to the additional temporary crosslinks provided by entanglement. The PBDMS chain is very flexible and, even when the reaction with boric acid has reached gelation (after which it can achieve little more [18]), relatively long.…”

Section: The Iso En 1621 Product Testmentioning

confidence: 58%

“…The crosshead was actively decelerated to compensate for decreasing thickness; similarly, the load response was actively converted to true stress on the assumption of constant specimen volume. Note that similar tests by Seetapan [10] on PBDMS used constant displacement rate, perhaps complicating the comparison of their results with those from DMA.…”

Section: Low Strain Ratesmentioning

confidence: 99%

“…In this paper we set aside the layer design and mouldability issues and focus on the impactattenuation performance of a monolithic slab of comparable thickness. There are many TPEs to choose from, and -although we have not explored this avenue -the precursor polysiloxane molecular weight, molecular weight distribution and degree of boronation could be used to tailor PBDMS properties [9,10]. The first successful blends were designed using a trial-and-error procedure: for each promising TPE, several blends were prepared, injection moulded into plates and subjected to EN 1621 tests under a range of conditions.…”

Section: Introductionmentioning

confidence: 99%

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Mechanical and rheological testing to develop thermoplastic elastomer-polyborodimethylsiloxane blends for personal impact protection

2020

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To claim 'wearability', clothing for protection against impact injury must not only act locally as a rigid shell under impact in order to satisfy drop-weight tests, but also flex freely with normal movement and offer permeability and light weight. Previous materials used carrier textiles coated with 'dilatant' but mechanically weak polyborodimethylsiloxane (PBDMS) compounds.We outline a procedure for developing blends of PBDMS with thermoplastic elastomers which, while minimizing the force transmitted in standard drop-weight tests on monolithic plate, can also be injection moulded into more wearable 3D shell structures. The first successful blends were developed by trial-and-error, involving the melding and testing of many plate specimens.The new procedure uses dynamic mechanical thermal analysis and time-temperature superposition to calibrate Zener-solid models for specific conditions within the service temperature and impact-speed envelope. Each model material is then subjected to a virtual dropweight impact test to estimate the peak transmitted impact force. These results guide the selection of blends suitable for further development, correlating well with those obtained using the previous, more laborious procedure. When distributed within a suitable blend, PBDMS contributes considerably greater impact force attenuation than bulk uniaxial tests indicate.

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Section: The Iso En 1621 Product Testmentioning

confidence: 58%

Section: Low Strain Ratesmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Mechanical and rheological testing to develop thermoplastic elastomer-polyborodimethylsiloxane blends for personal impact protection

2020

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“…Seetapan et al . prepared PBS by mixing PDMS with boric acid at 120 °C for 48 h and studied the viscoelastic and equibiaxial extension behavior of PBS . Tang et al .…”

Section: Introductionmentioning

confidence: 99%

Rheology of crosslinked entangled polymers: Shear stiffening in oscillatory shear

Zhang

Jiang

Chen

et al. 2019

J of Applied Polymer Sci

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Polyborosiloxane (PBS) was synthesized from boric acid and hydroxyl-terminated polydimethylsiloxane (PDMS). The oscillatory shear behavior of PBS formed by PDMS with different molecular weight was studied. The relaxation time of PBS was calculated by Doi-Edwards model. Finally, the shear-stiffening mechanism of reversibly crosslinked entangled polymer was obtained. Shear stiffening occurs at lower shear frequencies, which is mainly due to crosslinking bonds and friction between molecules hindering the movement of molecules. The increase in storage modulus at high frequencies is attributed to the resistance caused by entanglement in the stretching process of molecular chains. In addition, the molecular weight is greater and the degree of shear stiffening is higher. Such a conclusion is useful to further study the application of shear stiffening.

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“…In addition to the potential for greater interactions between the surface and binder, the diversity of cross-linking and functionalization in this class of polymers allows for additional handles that could be used to modify polymer properties. Depending on the degree of cross-linking, which can be modified with cross-linking agents, the mechanical properties of these polymers range from viscoelastic to rigid, [28][29][30] offering the potential to conduct studies on the relationship of mechanical properties and cycling performance. PBSs present additional characteristics consistent with requirements for effective binders in LIB electrodes.…”

mentioning

confidence: 99%

Application of Cross-Linked Polyborosiloxanes and Organically Modified Boron Silicate Binders in Silicon-Containing Anodes for Lithium-Ion Batteries

Shariaty

Qian

Cheng

et al. 2018

J. Electrochem. Soc.

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To determine the effect of cross-linking in polymer binders on gravimetric capacity and retention in charge/discharge cycling of lithium-ion batteries containing silicon anodes, polymers with a varied chemiophysical characters have been studied as electrode binders. Here we report the utilization of cross-linked polyborosiloxanes and a boron-modified organosilicate as binders for nanoparticulate silicon-containing anodes for lithium-ion batteries. We show that highly cross-linked binders enable a large degree of capacity to be accessed and that capacity retention is greater when the electrodes are cycled in half cells. More extensive analysis of the boron-modified organosilicate is further explored.

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Unimodal and bimodal networks of physically crosslinked polyborodimethylsiloxane: viscoelastic and equibiaxial extension behaviors

Cited by 29 publications

References 33 publications

Mechanical and rheological testing to develop thermoplastic elastomer-polyborodimethylsiloxane blends for personal impact protection

Mechanical and rheological testing to develop thermoplastic elastomer-polyborodimethylsiloxane blends for personal impact protection

Rheology of crosslinked entangled polymers: Shear stiffening in oscillatory shear

Application of Cross-Linked Polyborosiloxanes and Organically Modified Boron Silicate Binders in Silicon-Containing Anodes for Lithium-Ion Batteries

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