Mechanical and thermo‐mechanical studies of double networks based on thermoplastic elastomers

Singh, Narayani P.; Lesser, Alan J.

doi:10.1002/polb.21943

Cited by 26 publications

(31 citation statements)

References 40 publications

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“…The decrement of storage modulus with the decrease in glass transition temperatures, as shown in Table 4, may be associated with the decrement of cross-linking density of the PDMS samples because cross-linking increases Tg of a polymer by introducing restrictions in the molecular motions of the chains. 41 Material B presented a similar behavior (Fig. 2) because storage modulus is higher for the control samples and the samples after D3 procedure and then gradually decreased for treatments D4, D2, and D1.…”

Section: Discussionsupporting

confidence: 68%

“…The presented decrement in the graphs compared with the control samples may also suggest that there is less viscous behavior of the materials with lower degree of cross-linking. 41 As reported by Murata et al, 28 the stability of the dynamic mechanical properties to temperature changes would be a distinct advantage for service as a maxillofacial material because all portions of the maxillofacial prosthesis exposed to the atmosphere and human tissues, that is, various temperatures, will exhibit the same flexibility. Moreover, the combination of solar aging and elastomer composition could cause significant alterations on all dynamic properties.…”

Section: Discussionmentioning

confidence: 93%

“…40 Graphs can be divided into 3 distinct regions: the glassy region, the transition (leathery) region, and the rubbery region. 41 Storage modulus is related to the stiffness of the material, and the loss modulus is reflected in the damping capacity of the material. Thus, larger values of storage modulus are expected as cross-links increase.…”

Section: Discussionmentioning

confidence: 99%

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Dynamic Mechanical Thermal Analysis of Maxillofacial Prosthetic Elastomers

Eleni

Krokida

Polyzois

et al. 2014

Journal of Craniofacial Surgery

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In this study, dynamic mechanical thermal analysis was used to evaluate the changes that occurred in maxillofacial elastomers subjected to different disinfecting regimens. A commercial polydimethyl siloxane (PDMS) and an experimental chlorinated polyethylene (CPE) were treated with different disinfection procedures for a period that simulates 1 year of clinical service: microwave exposure (D1), hypochlorite solution (D2), neutral soap (D3), and a commercial disinfecting solution (D4). A fifth group was kept in dark storage as control. Dynamic mechanical thermal analysis tests operated in a fixed frequency (1 Hz) over a range of temperatures (-130°C to 20°C for PDMS, -60°C to 120°C for CPE). Loss modulus (G″), storage modulus (G'), and loss factor (tanδ) were recorded as a function of temperature. The obtained glass transition temperature (Tg) values were subjected to statistical analysis. Dynamic mechanical thermal analysis revealed changes in Tg values for both materials, which reflect the possible changes in their chemical and physical structure, after different disinfection procedures. The PDMS and CPE samples seem to have less dense structure maybe because of chain scission reaction that probably occurred during the disinfection procedures. According to statistical analysis, Tg values presented significant changes from the control samples among the different materials and disinfecting procedures. Microwave exposure and hypochlorite solution affect CPE significantly, whereas PDMS exhibited significant changes after being treated with a commercial antimicrobial agent, concerning changes that occurred in Tg. In all cases, Tg values were decreased compared with the untreated samples, which were stiffer, presenting higher Tg and G' values.

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Section: Discussionsupporting

confidence: 68%

Section: Discussionmentioning

confidence: 93%

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Dynamic Mechanical Thermal Analysis of Maxillofacial Prosthetic Elastomers

Eleni

Krokida

Polyzois

et al. 2014

Journal of Craniofacial Surgery

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“…DMA was carried out in a short temperature range, to compare DMA and tensile test results before and after sterilization, with a quick and cost‐effective method, which can become a routine test for biomedical materials. DMA results at lower and higher temperature ranges are described elsewhere for TPU, PEBA and SEBS at their native state; for this reason, these results are not discussed here.…”

Section: Resultsmentioning

confidence: 99%

Effect of steam on structure and mechanical properties of biomedical block copolymers

Todros

Venturato

Natali

et al. 2014

J Polym Sci B Polym Phys

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The effect of steam on the micro‐phase structure and mechanical properties of different block copolymers used in biomedical devices is investigated via FT‐IR, tensile tests and dynamic mechanical analysis (DMA). Steam sterilization, commonly performed on medical devices and simulated in this work, affects the copolymers' morphology, due to high temperature and humidity conditions. FT‐IR analysis reveals that steam induces a modification in the crystalline conformations of copolymers with a pre‐existing hydrogen bonding network, that is, thermoplastic polyurethanes (TPU) and poly(ether‐block‐amide) (PEBA), while it does not significantly affect the domain conformation in styrenic block copolymers (SEBS), due to weak interaction with water. As a consequence, relevant changes of the mechanical properties, closely related to the microdomain structure, are found for TPU and PEBA after sterilization, while SEBS mechanical behavior remains stable, as demonstrated by tensile tests and DMA results. For this reason, SEBS is suggested as the best choice in terms of durability in biomedical applications. © 2014 Wiley Periodicals, Inc. J. Polym. Sci., Part B: Polym. Phys. 2014, 52, 1337–1346

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“…Storage modulus is indicative of the energy elastically stored in the material as the temperature increases [42]. Graphs can be divided into three distinct regions; the glassy region, the transition (leathery) region and the rubbery region [43]. As the temperature increases, G 0 was found to decrease for all composites and this can be attributed to the increase in the molecular mobility of the polymer chains [44].…”

Section: Resultsmentioning

confidence: 99%

Effect of magnetite particle loading on mechanical and strain sensing properties of polyester composites

et al. 2015

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There is a great deal of interest in functional materials containing magnetite (Fe 3 O 4 ) due to their several advanced applications (e.g. lithium-ion batteries, wastewater treatment and drug delivery) of these materials. Recently, the ability of magnetic composite materials to operate as reliable strain sensors has attracted particular attention because of their unique mechanical and magnetic properties. Polyester polymer composites reinforced with magnetite Fe 3 O 4 micro-and nano-particles have been prepared at different particle loading levels, presenting magnetic properties. Nanoindentation technique is performed in order to study the local mechanical behavior of composites, taking into account stiffness correction after the creep deformation stage. In order to evaluate the effect of Fe 3 O 4 particles on bulk mechanical response, dynamic mechanical thermal analysis (DMTA) is used. The glass transition temperature (T g ) of the polyester filled with nanoparticles has shifted to higher temperature, as shown from the DMTA, in comparison with the composites filled with microparticles. The low concentration of particles in the micro-composites displayed enhanced reduced modulus, hardness and shear storage modulus, compared with that of pure polyester and nano-composites. Magnetic flux density-strain experiments confirmed the good strain sensitivity of the above materials.

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Mechanical and thermo‐mechanical studies of double networks based on thermoplastic elastomers

Cited by 26 publications

References 40 publications

Dynamic Mechanical Thermal Analysis of Maxillofacial Prosthetic Elastomers

Dynamic Mechanical Thermal Analysis of Maxillofacial Prosthetic Elastomers

Effect of steam on structure and mechanical properties of biomedical block copolymers

Effect of magnetite particle loading on mechanical and strain sensing properties of polyester composites

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