Effect of Restricted Phase Segregation and Resultant Nanostructural Heterogeneity on Glass Transition of Nonuniform Acrylic Random Copolymers

Faghihi, Farhad; Mohammadi, Naser; Hazendonk, Paul

doi:10.1021/ma2000652

Cited by 24 publications

(18 citation statements)

References 24 publications

(59 reference statements)

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“…Kwak and Kim 10 reported the observation of local phase separation into sea-island structures in crude NBRs from the analysis of the spin-lattice relaxation time T 1r of CH 2 . Faghihi et al 8 reported that random copolymers of butyl acrylate and methyl methacrylate showed nanophase segregation according to DMA, DSC and 13 C-NMR spin diffusion experiments. Kipper et al 9 reported that random copolymers of 1,6-bis(p-carboxyphenoxy)hexane and sebacic acid undergo microphase separation because of large differences in the segment-segment interaction parameters.…”

Section: Pulsed 1 H-nmr Analysis Of Crude Nbrsmentioning

confidence: 99%

“…Although almost all random copolymers show homogeneous morphology, it has been reported that some random copolymers show an inhomogeneous phase structure. 8,9 In the case of NBRs, the existence of phaseseparated structures was suggested by the spin-lattice relaxation time (T 1r ) analysis of CH 2 via the 13 C-NMR inversion recovery method. 10 According to these reports, the inhomogeneity was caused by an intramolecular inhomogeneous structure composed of segments with different monomer sequences and by large differences in the segmental interaction parameters.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Nanoscale heterogeneous structure of polyacrylonitrile-co-butadiene with different molecular mobilities analyzed by spin–spin relaxation time

Ono

Fujiwara

Nishimura

2013

Polym J

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To identify components with different spin-spin relaxation times, T 2 , in the solid-echo pulse proton nuclear magnetic resonance (1 H-NMR) spectra of crude acrylonitrile (AN)-butadiene rubbers (NBRs) with five different AN contents, we tried to understand the inhomogeneity in the crude NBRs in terms of their microstructures and molecular mobilities. The results of small-angle X-ray scattering, differential scanning calorimetry and dynamic mechanical analysis showed that crude NBRs have a singlephase and homogeneous morphology on the nanoscale. The microstructure of the crude NBRs shows alternately copolymerized AN-butadiene (BU) and BU block sequences, as indicated by 1 H-NMR spectra. The T 2 of the crude NBRs revealed three components with different molecular mobilities, even in homogeneous samples. The content of the highest-mobility component with T 2l is negligible. Judging from the AN content dependence of the 1 H ratio of these components, the low-mobility component with T 2s and high-mobility component with T 2m were assigned to the alternately copolymerized AN-BU sequences and BU block sequences, respectively.

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Section: Pulsed 1 H-nmr Analysis Of Crude Nbrsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Nanoscale heterogeneous structure of polyacrylonitrile-co-butadiene with different molecular mobilities analyzed by spin–spin relaxation time

Ono

Fujiwara

Nishimura

2013

Polym J

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“…Similar conclusions regarding [35,36]. Compositions of the MMA-rich and BA-rich copolymers of MBC30 were estimated using the Fox equation and T g s of neat PBA and PMMA, −51 and 112°C [28], respectively. The FloryHuggins interaction parameter, χ, of emulsion copolymerized MBC30: the MMA-rich (MBC91) and BA-rich (MBC25) copolymers was also calculated at different temperatures using Mayes' compressible regular solution model [37].…”

Section: Discussionmentioning

confidence: 55%

“…4a), introduced by Fredrickson and Larson [27]. The two-phase UCST copolymer blend composed of butyl acrylate-rich (BA-rich) and methyl methacrylate-rich (MMA-rich) copolymers [28,29]. Filippone and de Luna [30] also assigned the elastic modulus enhancement toward a steady state to either networking among nanoparticle clusters interspersed with the host polymer or non-interacting nanocomposites.…”

Section: Discussionmentioning

confidence: 99%

How do soft nanoparticles affect temperature-induced nonlinearity of a UCST copolymer blend?

Ghasemirad

Mohammadi

2014

Colloid Polym Sci

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Temperature-induced nonlinearity of an upper critical solution temperature (UCST) copolymer blend and its nanocomposites containing 5 wt% mono-size soft nanoparticles (SNPs) were investigated. Mechanical and thermal energies contribution into the nonlinearity of UCST copolymer blend was 8.9×10 3 Jm −3 and 2.2×10 3 Jmol −1 , respectively. Addition of SNP did not change the system thermal-based nonlinearity, while altered its mechanical contribution at constant heating and solicitation conditions. It diminished to 0.4× 10 3 Jm −3 in the nanocomposite containing nano-size dispersion of aged SNPs. Micron-size agglomeration of the fresh SNPs in the nanocomposite; however, enhanced the required mechanical energy for nonlinearity to 4.1×10 3 Jm −3 . Shorttime annealing of the nanocomposite with micron-size agglomerates reduced its mechanical energy part to 2.8 × 10 3 Jm −3 , while annealing extension maximized it at 9.3× 10 3 Jm −3 . Heating rate increase amplified the thermal contribution into the nonlinearity at constant or reduced mechanical contribution. Finally, room-temperature annealing magnified the temperature-induced nonlinearity of the UCST copolymer blend at minimum mechanical contribution.

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“…The width of the effective damping region coincides with the glass transition region, which is dominated by the dynamic heterogeneity of chain relaxation 8 , 9 . Based on this mechanism, strategies of tuning dynamic heterogeneity to broaden the frequency range have been developed, such as adding nanofillers 10 – 12 , blending polymers 13 – 15 , polymer/organic molecules hybrids 16 , 17 , copolymerization 8 , 18 , gradient polymers 19 , 20 , interpenetrating polymer networks 21 , 22 , and polymers with dangling chains 23 – 25 . However, all these strategies cannot significantly broaden the effective damping region due to the limitation of inherently narrow glass transition regions for general polymer materials, with a frequency range normally spanning 10 2 Hz 26 .…”

Section: Introductionmentioning

confidence: 79%

Ultrahigh energy-dissipation elastomers by precisely tailoring the relaxation of confined polymer fluids

Huang

et al. 2021

Nat Commun

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Energy-dissipation elastomers relying on their viscoelastic behavior of chain segments in the glass transition region can effectively suppress vibrations and noises in various fields, yet the operating frequency of those elastomers is difficult to control precisely and its range is narrow. Here, we report a synergistic strategy for constructing polymer-fluid-gels that provide controllable ultrahigh energy dissipation over a broad frequency range, which is difficult by traditional means. This is realized by precisely tailoring the relaxation of confined polymer fluids in the elastic networks. The symbiosis of this combination involves: elastic networks forming an elastic matrix that displays reversible deformation and polymer fluids reptating back and forth to dissipate mechanical energy. Using prototypical poly (n-butyl acrylate) elastomers, we demonstrate that the polymer-fluid-gels exhibit a controllable ultrahigh energy-dissipation property (loss factor larger than 0.5) with a broad frequency range (10−2 ~ 108 Hz). Energy absorption of the polymer-fluid-gels is over 200 times higher than that of commercial damping materials under the same dynamic stress. Moreover, their modulus is quasi-stable in the operating frequency range.

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Effect of Restricted Phase Segregation and Resultant Nanostructural Heterogeneity on Glass Transition of Nonuniform Acrylic Random Copolymers

Cited by 24 publications

References 24 publications

Nanoscale heterogeneous structure of polyacrylonitrile-co-butadiene with different molecular mobilities analyzed by spin–spin relaxation time

Nanoscale heterogeneous structure of polyacrylonitrile-co-butadiene with different molecular mobilities analyzed by spin–spin relaxation time

How do soft nanoparticles affect temperature-induced nonlinearity of a UCST copolymer blend?

Ultrahigh energy-dissipation elastomers by precisely tailoring the relaxation of confined polymer fluids

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