Pressure–volume–temperature data and surface tension of blends of poly(ethylene oxide) and poly(methyl acrylate) in the melt

Pfefferkorn, Dirk; Sonntag, Sven; Kyeremateng, Samuel O.; Funke, Zofia; Kammer, H. W.; Kreßler, Jörg

doi:10.1002/polb.22064

Cited by 11 publications

(14 citation statements)

References 32 publications

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“…It is often suggested that composites based on semicrystalline polymer matrices, notably polyolefins, exhibit a higher PTC intensity than composites based on amorphous polymers . The smaller change in resistivity in an amorphous polymer composite is related to the relatively small volume expansion, which is not sufficient to produce a significant and sudden change in resistivity . For example, composites with the same conductive filler type (Ni) and content showed a PTC intensity of six to seven orders of magnitude when based on semicrystalline polymers (i.e.…”

Section: Tuning Positive Pyroresistive Behaviourmentioning

confidence: 99%

“…21,37 The smaller change in resistivity in an amorphous polymer composite is related to the relatively small volume expansion, which is not sufficient to produce a significant and sudden change in resistivity. 38,39 For example, composites with the same conductive filler type (Ni) and content showed a PTC intensity of six to seven orders of magnitude when based on semicrystalline polymers (i.e. PE, PEO, polyethylene adipate) but only one to three orders of magnitude when based on amorphous polymers (i.e.…”

Section: Ptc Intensitymentioning

confidence: 99%

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Pyroresistivity in conductive polymer composites: a perspective on recent advances and new applications

Liu

Zhang

Porwal

et al. 2018

Polymer International

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Conductive polymer composites (CPCs) with pyroresistive behaviour are of interest for a wide variety of applications such as safe batteries, resettable fuses, temperature sensors and self‐regulating heating devices. Due to their ease of processing, low density, tunable electrical properties, good oxidation resistance, and good flexibility and toughness, CPCs have become the preferred choice of pyroresistive materials in a number of applications. The pyroresistive behaviour of CPCs can be tuned to satisfy the specific requirements of different applications. In this perspective paper, recent progress in the use of pyroresistive CPCs is reviewed. In particular, various factors influencing their performance are discussed and compared, in connection with the associated application, with a special focus on reproducibility and positive temperature coefficient intensity levels. Some of the remaining challenges are identified, together with future prospects in this evolving field. © 2018 Society of Chemical Industry

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Section: Tuning Positive Pyroresistive Behaviourmentioning

confidence: 99%

Section: Ptc Intensitymentioning

confidence: 99%

Pyroresistivity in conductive polymer composites: a perspective on recent advances and new applications

Liu

Zhang

Porwal

et al. 2018

Polymer International

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“…On the contrary, composites based on semi‐crystalline polymers, such as PE, PEO and polyethylene adipate (PEA) showed ∼6 to 7 orders of magnitude change in resistivity close to their melting points. The smaller change in resistivity with an amorphous polymer composite was attributed to the fact that the volume of amorphous polymer composites expand gradually with increasing temperature16 which is insufficient to produce significant changes in resistivity.…”

Section: Ptc Effects Of the Several Investigated Polymersmentioning

confidence: 99%

“…On the other hand, the large PTCs of semi‐crystalline polymers were attributed to the transformation of the crystalline phase to amorphous phase, which resulted in: (1) a large volume expansion near the melting point,16–18 and (2) increased the inter‐particle distance to a greated extend in between the conducting particles and its corresponding conductivity 19. These are the main reasons why the majority of existing resettable fuses and self‐limiting heating elements are based on semi‐crystalline polymers, in which the self‐limiting region is located near the melting point of the selected polymer 9.…”

Section: Ptc Effects Of the Several Investigated Polymersmentioning

confidence: 99%

Flexible Wireless Temperature Sensors Based on Ni Microparticle‐Filled Binary Polymer Composites

Jeon¹,

Lee²,

Bao³

2012

Advanced Materials

312

255

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Flexible and disposable sensors have great potential toward applications such as medical diagnostics, food safety and environmental monitoring. [ 1 , 2 ] Radio frequency identifi cation (RFID) tags were originally developed for identifi cation and tracking purposes. When RFID tags are combined with fl exible organic sensors, they could function as wireless sensors while possessing the merits of organic electronics, such as mechanical fl exibility, light weight and low cost. Remote temperature sensors would offer the possibility of monitoring temperature of human body, perishable food and medicine by simply attaching a fl exible tag. Several types of temperature sensors have been fabricated on fl exible substrates, such as thermocouples, [ 3 ] resistive temperature detectors (RTDs), [ 4 ] and organic diodes. [ 5 ] Thermocouples are based on the Seebeck effect and typically generate a voltage change between 40 to 70 μ V/ ° C. [ 3 , 6 ] As the resistance change of a standard 100 Ω RTD is only 0.4 Ω / ° C, [ 3 , 6 ] the readout of these temperature sensors requires hihgly accurate and complex electronic circuits, i.e. high gain amplifi ers and high precision analog to digital converters (ADCs), [ 7 ] making it diffi cult for integration and hence increases the overall cost in their fabrication process.In this work, we developed Ni microparticle-fi lled binary polymer composites as temperature sensors with greater improved reproducibility compared to single polymer composites. These materials showed a much higher sensitivity than other types of fl exible temperature sensors. In addition, the higher improved sensitivity enabled us to fabricate a wireless temperature sensor by integrating it with a passive RFID antenna. Our temperature sensor consists of a Ni microparticle-fi lled binary polymer composite with polyethylene (PE) and polyethylene oxide (PEO) as the matrix designed to be highly sensitive for monitoring human body temperature. Conductive particle-fi lled polymer composites have already been widely used commercially as antistatic and electromagnetic interference shielding materials. [ 8 ] In addition, it has also been shown that some polymer composites showed several orders of resistivity change with temperature. This phenomenon has been explored for self-limiting heating elements, over-current protectors and resettable fuses. [ 9 ] However, conductive particle-fi lled polymer composites have yet been used as temperature sensor. This is primarily due to the diffi culty in achieving a reproducible temperature sensing response. [10][11][12] Additionally, the sensitive ranges previously reported were > 70 ° C, [13][14][15] which is much higher than the temperature range needed for medical diagnostics, food safety and environmental monitoring.In our system, we chose a matrix polymer blend with both semi-crystalline PEO and PE. The resistivity versus temperature characteristic of a metal microparticle-fi lled polymer is determined largely by the thermal behavior of the polymer. As shown in Table 1 , amorphous ...

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“…Extensive studies on organic solvent-free electrolytes, for example on solid polymer electrolytes (SPEs), have been carried out [ 6 , 7 ] since 1980. One of the popular polymer hosts for SPEs is poly(ethylene oxide) (PEO), which is a semi-crystalline polymer with crystallinity amount up to 70% [ 8 , 9 , 10 , 11 , 12 ]. It is widely accepted that ionic percolation mainly takes place in the amorphous regions of polymer [ 6 , 11 ].…”

Section: Introductionmentioning

confidence: 99%

Effects on the Properties after Addition of Lithium Salt in Poly(ethylene oxide)/Poly(methyl acrylate) Blends

2020

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The studies of phase behavior, dielectric relaxation, and other properties of poly(ethylene oxide) (PEO)/poly(methyl acrylate) (PMA) blends with the addition of lithium perchlorate (LiClO4) were done for different blend compositions. Samples were prepared by a solution casting technique. The binary PEO/PMA blends exhibit a single and compositional-dependent glass transition temperature (Tg), which is also true for ternary mixtures of PEO/PMA/LiClO4 when PEO was in excess with low content of salt. These may indicate miscibility of the constituents for the molten systems and amorphous domains of the systems at room temperature from the macroscopic point of view. Subsequently, the morphology of PEO/PMA blends with or without salt are correlated to the phase behavior of the systems. Phase morphology and molecular interaction of polymer chains by salt ions of the systems may rule the dielectric or electric relaxation at room temperature, which was estimated using electrochemical impedance spectroscopy (EIS). The frequency-dependent impedance spectra are of interest for the elucidation of polarization and relaxation of the charged entities for the systems. Relaxation can be noted only when a sufficient amount of salt is added into the systems.

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Pressure–volume–temperature data and surface tension of blends of poly(ethylene oxide) and poly(methyl acrylate) in the melt

Cited by 11 publications

References 32 publications

Pyroresistivity in conductive polymer composites: a perspective on recent advances and new applications

Pyroresistivity in conductive polymer composites: a perspective on recent advances and new applications

Flexible Wireless Temperature Sensors Based on Ni Microparticle‐Filled Binary Polymer Composites

Effects on the Properties after Addition of Lithium Salt in Poly(ethylene oxide)/Poly(methyl acrylate) Blends

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