Effect of Curing Poly(&amp;lt;i&amp;gt;p&amp;lt;/i&amp;gt;-Phenylene Sulfide) on Thermal Properties and Crystalline Morphologies

Lee, Sungho; Kim, Do Hwan; Park, Jae-Ha; Park, Min; Joh, Han‐Ik; Ku, Bon‐Cheol

doi:10.4236/aces.2013.32017

Cited by 24 publications

(14 citation statements)

References 10 publications

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“…It is observed that PPS without thermal oxidation treatment was completely dissolved in the solvent, while PPS after treatment had a gel content of 1.8% as shown in Table . This result demonstrates that an effective cross-linking structure could only be formed by a prolonged high-temperature treatment, − and this result also verified that the oxidized functional groups formed even by melt processing in a short time. The obtained cross-linking structure then greatly improves the elasticity of the PPS melt and provides a prerequisite for the formation of stable bubbles in the subsequent foaming process.…”

Section: Resultssupporting

confidence: 57%

Ultrahigh Electromagnetic Wave Transmitting Polyphenylene Sulfide Microcellular Foams Based on Molecular Structure Design for 5G Communication

Zhang

Chen

Jin

et al. 2023

Ind. Eng. Chem. Res.

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In the scenario of fifth-generation communication, especially millimeter wave (mmW) transmission, microelectronic material is required to have better signal stability, that is, a lower dielectric constant (Dk ) and dielectric loss (Df ). This work takes full advantage of the low dielectric molecular structure characteristics in polyphenylene sulfide (PPS) and the nonresidual low dielectric characteristics of supercritical CO2 (scCO2) foaming to enhance the low dielectric performance. The distinct structure of a highly stable thioether bond and highly reactive hydrogen in the benzene ring in the PPS macromolecule enables the oxo-bridging between PPS molecular chains and hence increases PPS melt strength. By further adjusting the regularity in PPS molecular chains to broaden the melting range of PPS crystals, the PPS microcellular foam of large expansion ratio (16.5-fold) with uniform cells is obtained. It has an ultralow Dk of 1.14 and Df of 0.0005 at 3 GHz. In the Ka band of 26–40 GHz, the broadband signal transmission has nearly no loss (∼99%). Furthermore, it has a low density (<0.08 g/cm3), is hydrophobic (contact angle of 123.4°), and reaches V-0 level flame retardancy. This ultrahigh mmW transmission material with excellent comprehensive performance provides an alternative for solving the problems of mmW propagation in the existing dielectric materials.

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Section: Resultssupporting

confidence: 57%

Ultrahigh Electromagnetic Wave Transmitting Polyphenylene Sulfide Microcellular Foams Based on Molecular Structure Design for 5G Communication

Zhang

Chen

Jin

et al. 2023

Ind. Eng. Chem. Res.

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“…DMA results showed a corresponding increase in the temperature location of the dissipation peak and a decrease in its amplitude when T α increased above 100°C. Similarly, Lee et al [21] investigated commercial PPS by thermal curing and they found an increase of molecular weight due to crosslinking. They concluded the crosslinking of PPS affected crystallization behaviors significantly.…”

Section: Introductionmentioning

confidence: 95%

Effect of thermal aging on crystallization behaviors and dynamic mechanical properties of glass fiber reinforced polyphenylene sulfide (PPS/GF) composites

et al. 2020

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In this study, the main purpose is to systematically evaluate isothermal and non-isothermal crystallization behavior of short glass fiber-reinforced polyphenylene sulfide polymer composites (PPS/GF) by a wide range of commonly applied models and also to preciously discuss the crystallization evolution and dynamic mechanical properties together with the consideration of thermal aging effects. Some interesting progress concerning this study can be concluded as follows: the Avrami model was used to examine the isothermal crystallization behavior of PPS/GF and the Avrami plot results exhibit that the isothermal crystallization contains primary and second crystallization process. In terms of non-isothermal crystallization, the Jeriorny model and Mo model could describe the mechanism of nucleation and crystal growth of PPS/GF material under study. Also, the activation energy of non-isothermal crystallization is calculated (−58.78 kJ/mol) by Kissinger method. Another important aspect is that thermal aging has an obvious effect on crystallization behaviors of PPS under study. The degree of crystallinity increases from 44% (virgin sample) to 56% after 96 h of aging at 200°C. After a long period of oxidation up to 1080 h at 200°C, the crystallinity degree decreases to 36.6% due to thermo-oxidation effect. DMA results imply that thermal aging may lead to more crosslinking reactions and result into more restriction of molecule mobility in PPS composite materials.

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“…This is because the linear or branched molecular structures of thermoplastics become more brittle during thermal aging [ 36 ]. Researchers attributed this to the cross-linking and crystallinity, which depended on the temperature and the exposure time, as reported by Zhang et al [ 37 ] and Lee et al [ 38 ]. Molecular chain scission, post-crosslinking, and crystallinity increment also occur in the GF/PPS composite samples during thermal aging [ 39 ].…”

Section: Resultsmentioning

confidence: 83%

Thermal Aging Effects on the Mechanical Behavior of Glass-Fiber-Reinforced Polyphenylene Sulfide Composites

Deng

Song

et al. 2022

Polymers

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In this article, the thermal aging behavior of polyphenylene sulfide (PPS) composites, reinforced by 20% glass fibers (GFs), in thermal aging temperatures ranging from 85 to 145 °C was studied. Tensile and bending properties and color changes in the thermally aged samples were investigated. The results showed that thermal aging at this temperature range resulted in the degradation of mechanical properties. Both the tensile and flexural strength of the GF/PPS composites were significantly reduced after thermal aging at 145 °C. Decreased strength and brittle fracture were observed because thermal aging at high temperatures resulted in the deterioration of the interfaces between the GFs and PPS matrix. The degradation of the mechanical properties of the composite samples can be reflected by the color change, which means that the mechanical properties of the GF/PPS composite samples under thermal aging are predictable using color change analysis.

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Effect of Curing Poly(<i>p</i>-Phenylene Sulfide) on Thermal Properties and Crystalline Morphologies

Cited by 24 publications

References 10 publications

Ultrahigh Electromagnetic Wave Transmitting Polyphenylene Sulfide Microcellular Foams Based on Molecular Structure Design for 5G Communication

Ultrahigh Electromagnetic Wave Transmitting Polyphenylene Sulfide Microcellular Foams Based on Molecular Structure Design for 5G Communication

Effect of thermal aging on crystallization behaviors and dynamic mechanical properties of glass fiber reinforced polyphenylene sulfide (PPS/GF) composites

Thermal Aging Effects on the Mechanical Behavior of Glass-Fiber-Reinforced Polyphenylene Sulfide Composites

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