Abnormal increase of glass transition temperature of poly(propylene carbonate) modified with rubber particles

Wang, Xiang; Li, Zhuoxin; Cao, Xingzhong; Wang, Baoyi; Qi, Guicun; Zhang, Xiaohong; Gao, Jianming; Bing-hai, LI; Qiao, Jinliang

doi:10.1002/pc.22283

Cited by 9 publications

(6 citation statements)

References 13 publications

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“…Generally, for immiscible systems, the interfacial boundaries of the matrix and dispersed phase can bring in extra free volumes [31,43,44]. However, the phase separation especially large dispersed phases will decrease the interfacial areas between the dispersed phase and the matrix, which is unfavorable for the increase in free volumes [45].…”

Section: Dielectric Performance Free Volumes and Moisture Resistancementioning

confidence: 99%

Dielectric and mechanical properties of diglycidyl ether of bisphenol a modified by a new fluoro-terminated hyperbranched poly(phenylene oxide)

et al. 2013

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Diglycidyl ether of bisphenol A (DGEBA)/fluoro-terminated hyperbranched poly(phenylene oxide) (FHPPO) composites with improved mechanical and dielectric performances were prepared by blending a FHPPO with DGEBA. The low-polarity building blocks, abundant fluorinated terminal groups, and the inherent free volume brought by FHPPO efficiently lowered the dielectric constant and the dissipation factor. The free volumes of the cured DGEBA/FHPPO composites, which were quantified by positron annihilation lifetime spectroscopy, increased with the FHPPO loading. The moisture absorption of composites also decreased after the introduction of FHPPO due to the hydrophobicity of fluorinated substituents. Dynamic mechanical analysis tests and scanning electron morphology revealed that FHPPO phase separated from the composites during the curing process. The average diameter of dispersed FHPPO particles increased proportionally with the FHPPO loading. Composites with dispersed particle size of around 150 nm showed the best comprehensive mechanical performance. In addition, incorporation of FHPPO, which has lots of aromatic structures, into DGEBA also increased the thermal stabilities. POLYM. COMPOS., 34:1051-1060,

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Section: Dielectric Performance Free Volumes and Moisture Resistancementioning

confidence: 99%

Dielectric and mechanical properties of diglycidyl ether of bisphenol a modified by a new fluoro-terminated hyperbranched poly(phenylene oxide)

et al. 2013

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“…The melting peaks of the composite membranes are all 30 C around, which has a significant forward shift compared with PEG (38.54 C, Table 1), which may be because of the formation of eutectic after PEG is processed into emulsion. 29 In addition, the melting and crystallization peak areas gain with raising core feed rate, which reflects the increase in their latent heat value, that is, the increase in heat absorption. When the core flow rate is 0.05, 0.1, and 0.15 mL/h, the latent heat is 26.90, 48.68, and 65.04 J/g, respectively.…”

Section: Thermal Propertiesmentioning

confidence: 99%

PVA@tea tree oil‐emulsion core–shell microfiber membranes for extending the shelf life of fruits

Dai,

Liu,

Wang

et al. 2023

J of Applied Polymer Sci

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In this work, a temperature‐regulating and antimicrobial–antioxidant fiber membrane was fabricated using coaxial electrospinning technology. The tea tree oil (TTO) emulsion used as the core solution, polyvinyl alcohol (PVA) as the shell solution for coaxial electrospinning, has been demonstrated. Compared with the original PVA fibers, the average diameter of the fibers is increased after coaxial electrospinning, and the diameter increases with the core flow rate. The diameters corresponding to core flow rates of 0.05, 0.1, and 0.15 mL/h are 561, 597, and 849 nm, respectively. Via in vitro release experiment demonstrated that the quantity of TTO released from the composite membrane increased with the elevation of temperature. The inclusions TTO and polyethylene glycol give the film excellent antibacterial–antioxidant properties and a delayed thermal response. More intriguingly, core–shell fiber membranes containing TTO in the core part are effective in slowing down the formation of oxidation spots on the surface of banana compared with pure PVA membranes. Seven days after wrapping bananas with different membranes, the surface of banana in pure PVA film was full of oxidized spots, whereas banana in PVA core–shell fibers showed only one obvious spot.

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“…In the new era, functional composite structures have attracted increasing attention due to their excellent performance for wide‐reaching applications. [ 16,17 ] Polymer composites with porous networks and connected channels could provide good optical [ 18 ] and thermal storage [ 19 ] properties. Among the various solar harvesters (as‐called evaporators), the multi‐layer composite structure is the most widely used because the typical multi‐layer composite structure of the solar evaporator includes the following elements.…”

Section: Introductionmentioning

confidence: 99%

Experimental and numerical evaluation of the surface‐localized heating capacity of the photothermal nanocomposite‐incorporated knit fabrics

et al. 2023

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Personal protection and perspiration evaporation are major features of a functional clothing system intended for outdoor environment applications. The aim of this article is to investigate the dynamic performance of an advanced multifunctional textile under solar radiation. The influence of the fabric properties of the double‐layer structure and the optical property of the photothermal nanocomposite based‐porous membrane (polyacrylonitrile PAN/carbon nanotube CNT) on the evaporation performance were experimentally and numerically discussed. Initially, a dedicated experimental study was conducted to measure the actual evaporation performance of the functional fabric. Following this, a two‐dimensional multi‐fluid model, simulated using COMSOL software, is applicable to predict experimental evaporation rates with a reasonable accuracy of 90%. The results showed that the dense structure had a greater wicking‐flow rate of 0.5 cm2 s−1 but lower evaporation performance in contrast to the permeable fabric. The incorporation of the photothermal nanofibers into the double‐layer fabric structure enhanced the surface‐localized heating capacity. Through the evaporation process, compared to conventional fabric, the advanced fabric structure exhibited approximately 3.5–4.4°C higher outer surface temperature. We concluded that the proposed multi‐layer structure has excellent potential to enhance the solar absorption efficiency in the visible range by 50% on average. Besides, the improved evaporation performance of the functional structure was 48% and 55%, respectively, under 0.6 and 1.0 sun illumination. In addition to the clothing field, this study can be extended for wide‐reaching applications based on solar vapor generation systems.

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Abnormal increase of glass transition temperature of poly(propylene carbonate) modified with rubber particles

Cited by 9 publications

References 13 publications

Dielectric and mechanical properties of diglycidyl ether of bisphenol a modified by a new fluoro-terminated hyperbranched poly(phenylene oxide)

Dielectric and mechanical properties of diglycidyl ether of bisphenol a modified by a new fluoro-terminated hyperbranched poly(phenylene oxide)

PVA@tea tree oil‐emulsion core–shell microfiber membranes for extending the shelf life of fruits

Experimental and numerical evaluation of the surface‐localized heating capacity of the photothermal nanocomposite‐incorporated knit fabrics

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