Multicomponent latex IPN materials: 2. Damping and mechanical behavior

Hu, Rundong; Dimonie, Victoria L.; El‐Aasser, M. S.; Pearson, Raymond A.; Hiltner, A.; Mylonakis, S. G.; Sperling, L. H.

doi:10.1002/(sici)1099-0488(19970730)35:10<1501::aid-polb4>3.0.co;2-u

Cited by 99 publications

(54 citation statements)

References 5 publications

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“…Thus, high tan d values over a broad temperature window are desired for good damping performance. Typically, tan d P 0.30 over a temperature range of P60°C is desired [70][71][72][73][74][75][76][77][78]. We have used the same criterion to evaluate our PHUs.…”

Section: Dynamic Mechanical Analysismentioning

confidence: 99%

“…Dynamic mechanical analysis (DMA) of TPUs typically shows sharp transitions with well-defined loss tangent (tan d) peaks over a narrow temperature range [57][58][59][60][61][62][63][64][65][66][67][68][69]. A common criterion to identify effective, broad-temperature-range, acoustic and/ or vibration damping materials is tan d P 0.30 over at least a 60°C temperature range [70][71][72][73][74][75][76][77][78]. Given its characteristic viscoelastic response, TPU by itself cannot serve as a broad-temperature-range acoustic damping material.…”

Section: Introductionmentioning

confidence: 99%

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Novel thermoplastic polyhydroxyurethane elastomers as effective damping materials over broad temperature ranges

Beniah

Liu

Heath

et al. 2016

European Polymer Journal

104

111

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a b s t r a c tNon-isocyanate thermoplastic polyhydroxyurethane (PHU) elastomers were synthesized from cyclic carbonate aminolysis using polytetramethylene oxide (PTMO) as soft segment and divinylbenzene dicyclocarbonate and three diamine chain extenders as hard segment with a range of hard-segment content. Characterization was done via Fourier transform infrared spectroscopy, small-angle X-ray scattering (SAXS), uniaxial tensile testing, and dynamic mechanical analysis (DMA). SAXS reveals that these PHUs possess nanophaseseparated morphology with 10-20 nm interdomain spacings. These PHUs display elastomeric response and tunable tensile properties with Young's modulus ranging from 27 to 200 MPa, tensile strength from 0.3 to 9.7 MPa and elongation at break ranging up to greater than 2000%. DMA reveals that nanophase separation in these PHUs is accompanied by broad interphases having a wide range of local composition; this nanophase separation differs significantly from that manifested by thermoplastic polyurethane elastomer (TPU) due to hydrogen bonding of hydroxyl groups in the hard segments to the PTMO soft segment. These PHUs show very good damping performance with tan d P 0.30 over broad temperature ranges (P60°C), which are tunable through simple variation of hardsegment content and chain extender structures.

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Section: Dynamic Mechanical Analysismentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Novel thermoplastic polyhydroxyurethane elastomers as effective damping materials over broad temperature ranges

Beniah

Liu

Heath

et al. 2016

European Polymer Journal

104

111

View full text Add to dashboard Cite

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“…Usually, a homopolymer possesses an effective damping region over a temperature range of only about 20-30 8C, which is rather narrow for practical applications, for example, it would be typically 60-80 8C for outdoor use. [5] Summary: Based on the fact that rubber can be chemically modified by sulfur, and sulfur can diffuse into rubber driven by a concentration gradient and chemical reaction, a new approach for the preparation of a polymer with a gradient from rubbery to glassy phase has been developed using the sulfur-vulcanization reaction of rubber. The gradient polymer obtained exhibits a wide transition range spanning over 100 8C with a peak half-width of 69 8C.…”

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confidence: 99%

A Novel Approach to Prepare a Gradient Polymer with a Wide Damping Temperature Range by In‐Situ Chemical Modification of Rubber During Vulcanization

Wang

Zhang

et al. 2006

Macromol. Rapid Commun.

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IntroductionDamping materials are finding numerous applications in the aircraft, automobile, and machinery industries for both the reduction of unwanted noise and the prevention of vibrational fatigue failure. [1] The viscoelastic properties of polymers make them ideally suited for use as effective damping materials. [2,3] The damping behavior of a polymer is mainly dominated by the viscoelastic transition region between the glassy state and rubbery state (near and above the glass transition temperature, T g ). In this region, polymer chain segments, but not whole polymer chains, can vibrate in phase with an external vibration. However, changes in molecular conformation can not keep up with the imposed vibration, which causes internal friction and energy dissipation. Damping behavior is a reflection of this internal friction. [4] The stronger the internal friction, the higher the loss modulus (E 00 ) or loss tangent (tan d) at the applicable temperature, and the better the damping property. Since real damping products are often used over a broad range of temperature and frequency, polymeric materials are needed with a greater width of the loss modulus or loss tangent peak. Usually, a homopolymer possesses an effective damping region over a temperature range of only about 20-30 8C, which is rather narrow for practical applications, for example, it would be typically 60-80 8C for outdoor use. [5] Summary: Based on the fact that rubber can be chemically modified by sulfur, and sulfur can diffuse into rubber driven by a concentration gradient and chemical reaction, a new approach for the preparation of a polymer with a gradient from rubbery to glassy phase has been developed using the sulfur-vulcanization reaction of rubber. The gradient polymer obtained exhibits a wide transition range spanning over 100 8C with a peak half-width of 69 8C. The mechanism of forming the gradient structure is also discussed.The gradient polymer exhibits a broad tan d width from À60 to 76 8C with the peak half-width spanning about 69 8C, indicating a wide damping temperature range.

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“…In particular, it is noteworthy that as a result the same performance as that of many interpenetrating polymer networks (IPN) can be obtained. 12,13 Therefore, this is considered to be a new approach to improving the temperature dependence of tan δ.…”

Section: Resultsmentioning

confidence: 99%

Interphase Migration of a Hindered Phenol Compound in Acrylate Rubber/Chlorinated Polypropylene Blends

2003

Polym J

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KEY WORDSAcrylate Rubber / Chlorinated Polypropylene / Hindered Phenol / Dynamic Mechanical Property / Interphase Migration / Damping / In recent studies, 1, 2 our attention has been focused on the discovery of unknown functions of a polymer elicited by the addition of small molecular substances. It was found that the addition of 3,9-bis{1,1-dimethyl-2[β-(3-tert-butyl-4-hydroxy-5-methylphenyl) propionyloxy]ethyl}-2,4,8,10-tetraoxaspiro[5,5]-undecane (AO-80) into an immiscible acrylate rubber (ACM) and chlorinated polypropylene (CPP) blend not only resulted in a remarkable enhancement of the damping properties but also gave the ACM/CPP blend significant peel strength. As a result, a ternary blend of ACM/CPP with more AO-80 was found to be a very good self-adhesive damping material. It has also been revealed that the AO-80 molecules are preferentially distributed to a continuous ACM phase when the AO-80 content is lower than 30%. In order to obtain a very broad, almost rectangular transition range with values for the area under the linear loss factor (tan δ) curve, it is important to control AO-80 distribution in each phase of an immiscible ACM/CPP blend because polymer blends with organic small molecule substance prepared by different methods could show differences in damping properties. 3 On the other hand, much interest has been shown in diffusion and transport of organic small molecules within polymer blends. 4,5 In addition the technological importance of the molecular transport of organic small molecules within polymer blends plays a vital role in a variety of applications such as separation processes, 6 controlled drug release, 7 reverse osmosis, 8 and microelectronics. 9 It has been pointed out that the primary goal of these studies was to estimate the sorption, diffusion, and permeation coefficients and to study their temperature dependence. However, a survey of the literature revealed that the mechanism by which the transport of organic small molecule influences the dynamic mechanical properties of a polymer blend has not been studied thoroughly.The aim of the present study is to establish a method for controlling the dynamic mechanical properties of an immiscible ACM/CPP blend with AO-80 by the transport of AO-80 molecules from CPP domains to the ACM matrix during heat treatment at a temperature above the melting point of AO-80. For this purpose, unpressed samples of ACM/CPP with AO-80 sample in which AO-80 as crystalline particles are preferentially distributed in the CPP phase were prepared. Another aim of this study was to try establishing a new concept for designing a damping material with a broad, almost rectangular loss tangent tan δ peak. EXPERIMENTALThe ACM used in this study was commercial grade (Nippon zeon Co., Nipol AR42 W); CPP with 29.5% of the weight content of chloride was a thermoplastic resin (Nippon paper industries Co., Superchlon 803MWS). The AO-80 (as shown in Figure 1 of ref 1) used as a functional additive, was a commercial antioxidant (ADK STAB AO-80; Asahi Denka Industries Co.)...

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Multicomponent latex IPN materials: 2. Damping and mechanical behavior

Cited by 99 publications

References 5 publications

Novel thermoplastic polyhydroxyurethane elastomers as effective damping materials over broad temperature ranges

Novel thermoplastic polyhydroxyurethane elastomers as effective damping materials over broad temperature ranges

A Novel Approach to Prepare a Gradient Polymer with a Wide Damping Temperature Range by In‐Situ Chemical Modification of Rubber During Vulcanization

Interphase Migration of a Hindered Phenol Compound in Acrylate Rubber/Chlorinated Polypropylene Blends

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