Dynamic Viscoelasticity of Poly(butyl acrylate) Elastomers Containing Dangling Chains with Controlled Lengths

Yamazaki, Haruna; Takeda, Masanao; Kohno, Yoshiyuki; Ando, Hiroshi; Urayama, Kenji; Takigawa, Toshikazu

doi:10.1021/ma201941v

Cited by 86 publications

(70 citation statements)

References 22 publications

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“…The onset of large-scale motion of a polymer network with long dangling chains near T g requires a higher energy and free volume than those of ideal network, thereby increasing the value of tan δ peak. Yamazaki et al 33 studied the influence of many dangling chains with uniform lengths on poly(butyl acrylate) elastomers and found a high mechanical damping (tan δ > 1) at a characteristic frequency. Compared with PU-TG, PU-ML exhibits a lower tan δ peak value and higher T g .…”

Section: Resultsmentioning

confidence: 99%

Influence of Dangling Chains on Molecular Dynamics of Polyurethanes

Zhang

et al. 2013

Macromolecules

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The effect of dangling chains on phaseseparated microstructure and molecular dynamics for polyurethanes (PUs) was investigated. PUs with different dangling chain lengths and polar groups were prepared through changing the types of diol extender. The molecular dynamics was studied by a combination of dynamic mechanical analysis (DMA) and broadband dielectric relaxation spectroscopy (BDRS). Four relaxations (processes), namely, a secondary relaxation (β), the soft phase segmental relaxation (α), the I process associated with hydrogen bond, and Maxwell− Wagner−Sillars (MWS) interfacial polarization process caused by charge accumulation at hard/soft phase interfaces, were detected. The I process occurred in temperatures lower than that of MWS process but higher than α relaxation in general. The β relaxation remains unaffected with changing dangling chain lengths or polar groups. However, the glass transition temperature (T g ) of the soft phase shifts to lower temperature, and the segmental motion becomes faster with increasing dangling chain length, while the introduction of a polar ester group into the dangling chains makes it slow down, corresponding to a higher T g , and results in a higher fragility. On the other hand, there is an absence of I process, and the MWS process shifts to higher frequencies when longer dangling chain is introduced. In the case of increasing the hard segment content, the I process reappears and the MWS process slows down. It is suggested that these results are related to the H-bond interactions within hard segments and the micromorphologies of PUs.

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Section: Resultsmentioning

confidence: 99%

Influence of Dangling Chains on Molecular Dynamics of Polyurethanes

Zhang

et al. 2013

Macromolecules

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“…Note that the S end block and the Ba middle block exhibit T g at ≈100 and −25 °C, respectively. Several types of S‐Ba‐S copolymers are synthesized by varying the middle block molecular weights ( M middle ), where the M middle s of these copolymers are designed to be sufficiently larger than M c of poly(butyl acrylate) (≈ 55k) . To attain high molecular weight copolymers with M middle >> 1000k, we utilize high‐pressure living radical polymerization methodology for our material design.…”

Section: Introductionmentioning

confidence: 99%

Highly Extensible Supramolecular Elastomers with Large Stress Generation Capability Originating from Multiple Hydrogen Bonds on the Long Soft Network Strands

Hayashi

Noro

Matsushita

2016

Macromol. Rapid Commun.

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Highly extensible supramolecular elastomers are prepared from ABA triblock-type copolymers bearing glassy end blocks and a long soft middle block with multiple hydrogen bonds. The copolymer used is polystyrene-b-[poly(butyl acrylate)-co-polyacrylamide]-b-polystyrene (S-Ba-S), which is synthesized via reversible addition-fragmentation chain transfer (RAFT) polymerization. Tensile tests reveal that the breaking elongation (εb ) increases with an increase in the middle block molecular weight (Mmiddle ). Especially, the largest S-Ba-S with Mmiddle of 3140k, which is synthesized via high-pressure RAFT polymerization, achieves εb of over 2000% with a maximum tensile stress of 3.6 MPa, while the control sample without any middle block hydrogen bonds, polystyrene-b-poly(butyl acrylate)-b-polystyrene with Mmiddle of 2780k, is merely a viscous material due to the large volume fraction of soft block. Thus, incorporation of hydrogen bonds into the large molecular weight soft middle block is found to be beneficial to prepare supramolecular elastomers attaining high extensibility and sufficiently large stress generation ability simultaneously. This outcome is probably due to concerted combination of entropic changes and internal potential energy changes originating from the dissociation of multiple hydrogen bonds by elongation.

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“…But the polymer network with dangling chain structure need higher energy and more free volume to move, resulting in the increase of the internal friction of chain segment motion and the peak value of tan δ. This is consistent with Yamazaki's research on the effects of various lengths of dangling chains on polymers …”

Section: Results and Analysismentioning

confidence: 99%

Inner relationship between the damping property and the sand‐fixing durability of polymer materials

Xie

Liu

Chen

et al. 2018

J of Applied Polymer Sci

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This article for the first time reveals the impact of the damping property of materials on its sand‐fixing durability. Based on the turbulence of wind, it could be regarded as a kind of periodic mechanical force. So, when polymers are used to fix sand, they would constantly perceive a periodic force of wind. And, this force would give rise to yielding fracture and fatigue of polymer, so that the sand‐fixing durability of material could be weakened significantly. To impair the periodic force of wind and extend the durability of sand‐fixation polymer materials, we, for the first time, introduce the designing principle of macromolecular damping material, that can transform external mechanical force into own thermal energy, into the preparation of sand‐fixing materials. In this work, poly(vinyl acetate) (PVAc) emulsions with different dangling chain have been synthesized successfully in order to improve their damping properties. The effects of the prepared PVAc with gradually growing dangling chain length have been investigated on their damping properties, on the sand stabilization strengths and sand‐fixing durability. And the relationship between the damping property and the sand‐fixing property of PVAc was built by simulating wind tunnel test. The experimental results show that, introducing the dangling chain could significantly improve the damping temperature range and extend the anti‐wind erosion time of PVAc. It has to be noticed that, introducing the dangling chain, will provide a double effects for the sand stabilization strength of materials, i.e., it can improve both the flexibility of the side‐chain and the internal friction of the molecular chains. Wind tunnel test verified that introducing the dangling chain can raise the damping performance of material and convert more periodic force of wind into the friction heat of molecular chain, and thus impair the damage of wind on the materials and improve their anti‐wind erosion properties. These findings suggest that the damping material applied in sand fixation is a bright idea and successful method for improving the sand‐fixing durability. © 2018 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2019, 136, 47208.

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Dynamic Viscoelasticity of Poly(butyl acrylate) Elastomers Containing Dangling Chains with Controlled Lengths

Cited by 86 publications

References 22 publications

Influence of Dangling Chains on Molecular Dynamics of Polyurethanes

Influence of Dangling Chains on Molecular Dynamics of Polyurethanes

Highly Extensible Supramolecular Elastomers with Large Stress Generation Capability Originating from Multiple Hydrogen Bonds on the Long Soft Network Strands

Inner relationship between the damping property and the sand‐fixing durability of polymer materials

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