Multifaceted property tailoring of polyamide 6 by blending miscible and immiscible components: ternary blends of polyamide 6/polyethylene terephthalate/phenol novolac

Hirai, Takayuki; Onochi, Yusaku; Kawada, Jumpei

doi:10.1039/d0ra02344b

Cited by 10 publications

(6 citation statements)

References 33 publications

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“…This difference might be caused by some minor crystallization of PCL in the blend. PCL crystallization causes phase separation, [31][32][33][34][35] increasing the concentration of PC in the amorphous phase and, concomitantly, the refractive index of the PC-PCL blend.…”

Section: Discussionmentioning

confidence: 99%

Strong, transparent composites based on glass‐fiber textile and a polycarbonate–polycaprolactone blend with matching refractive indices

Hirai

Muraoka

Okamoto

2022

J of Applied Polymer Sci

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Composites are being researched as lightweight, thermal‐insulating alternatives to glass; however, composite materials are generally opaque. In this study, a transparent composite is developed based on E‐glass fiber and a polymer blend by matching their refractive indices. To avoid the opacity caused by phase separation, a polymer blend featuring highly miscible polycarbonate (PC) and polycaprolactone (PCL) is used as the matrix of the composite. The refractive indices of PC and PCL are higher and lower, respectively, than that of E‐glass fiber; thus, the refractive index of a PC–PCL blend can be matched with that of E‐glass fiber by optimizing its composition (PC:PCL weight ratio). Moreover, the crystallization of PCL in a PC–PCL blend is inhibited by the incorporation of sufficient PC, eliminating the light scattering associated with crystalline PCL. The transparency of the proposed composite based on E‐glass fiber and a PC–PCL blend is optimal at a PC:PCL weight ratio of 65:35. Furthermore, the impregnation of a glass‐fiber textile with a PC–PCL blend with a PC:PCL weight ratio of 65:35 under evacuated conditions produces a strong, transparent composite with tensile and impact strengths that exceed those of PC and a corresponding short glass fiber–reinforced composite.

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Section: Discussionmentioning

confidence: 99%

Strong, transparent composites based on glass‐fiber textile and a polycarbonate–polycaprolactone blend with matching refractive indices

Hirai

Muraoka

Okamoto

2022

J of Applied Polymer Sci

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“…In contrast, the reflectance spectrum of PMMA/PVDF/ PA6/CB was similar to that of PMMA/PVDF/PCL/CB at 20 °C, irrespective of the temperature, because PA6 remained crystalline even at 60 °C, which is significantly lower than its melting temperature (ca. 221 °C, 38 Figure S19).…”

Section: Demonstration Of Thermal Management Viamentioning

confidence: 99%

“…Herein, we propose a novel thermoresponsive polymer blend composed of a phase-changing polymer and smart roof, which absorbs sunlight at low temperatures and reflects it at high temperatures (Figure a). Polymer blends are important engineering materials because they can be produced via melt-blending, which is a scalable and inexpensive process. − We investigated a ternary blend including both miscible and immiscible polymer blend systems. The immiscible component of the phase-changing polymer comprises an isolated phase, and the transparency switching of the ternary blend is achieved by its phase transition between the crystalline and molten states.…”

Section: Introductionmentioning

confidence: 99%

Scalable Thermochromic Composite Based on a Ternary Polymer Blend for Temperature-Adaptive Solar Heat Management

Hirai

Kugimoto

Oyama

et al. 2023

ACS Appl. Mater. Interfaces

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A scalable and durable thermochromic composite is developed for temperature-adaptive solar heat management using a carbon absorber and a thermoresponsive polymer blend consisting of an isolated polycaprolactone phase (PCL) and a continuous phase of miscible poly(methyl methacrylate) and polyvinylidene fluoride. The ternary blend exhibits reversible haze transition originating from the melting and crystallization of PCL. The refractive index matching between the molten PCL and surrounding miscible blend contributes to high-contrast haze switching in the range of 14–91% across the melting temperature of PCL (ca. 55 °C). The solar-absorption-switching properties of the composite are due to the spontaneous light-scattering switching in the polymer blend and the presence of a small amount of carbon black. Spectral measurements indicate that the solar reflectance of the composite sheet varies by 20% between 20 and 60 °C upon lamination with a Ag mirror. Solar heat management using the thermochromic composite is successfully demonstrated under natural sunlight, thereby realizing a temperature-adaptive thermal management system.

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“…When a blend is miscible, it has only one Tg, intermediate to that of the pure components, while immiscible systems exhibit the Tg values of the pure polymers because the interactions between the polymer chains of the system components are so weak that separate domains are formed between the components [43]. Other blends have systems where a small amount of the chains of each polymer interact, causing a change in the temperature and speed with which the chains acquire mobility, leading to a small shift from the Tg values of the pure components; such systems are classi ed as partially miscible [44].…”

Section: Differential Scanning Calorimetry (Dsc)mentioning

confidence: 99%

Effect of Surfactant on the Formation of Chitosan/ε-Polycaprolactone Blend Films for Food Packaging Applications

Gomes¹,

Silva²,

Freitas³

et al. 2021

Preprint

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The objective of this study was to develop and characterize chitosan-ε-polycaprolactone (CHI/PCL) polymer blends with Tween 80 as a compatibilizer for application in packaging. The blends were produced by casting, with up to 10% (w/w) PCL in the CHI matrix. These blends were characterized in terms of their microstructure, chemical interactions, mechanical and thermal properties, solubility and water vapor permeability (WVP). The micrographs showed microsphere-like structures from the PCL in the continuous phase of CHI. Fourier transform infrared spectroscopy (FTIR) indicated a high interaction between CHI amino groups and PCL carbonyls, resulting in blends with greater ductility than the pure CHI film, thus providing greater flexibility. In the crystallinity analyses, the presence of PCL favored an increase in crystalline regions, limiting the passage of light. Given the results, blends are an alternative for application in multilayer systems and can be considered for use as a biodegradable fraction in food packaging.

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Multifaceted property tailoring of polyamide 6 by blending miscible and immiscible components: ternary blends of polyamide 6/polyethylene terephthalate/phenol novolac

Abstract: Properties of polyamide 6 (PA6) under hygrothermal conditions are improved by blending polyethylene terephthalate (PET, immiscible) and phenol novolac (PN, miscible).

Cited by 10 publications

References 33 publications

Strong, transparent composites based on glass‐fiber textile and a polycarbonate–polycaprolactone blend with matching refractive indices

Strong, transparent composites based on glass‐fiber textile and a polycarbonate–polycaprolactone blend with matching refractive indices

Scalable Thermochromic Composite Based on a Ternary Polymer Blend for Temperature-Adaptive Solar Heat Management

Effect of Surfactant on the Formation of Chitosan/ε-Polycaprolactone Blend Films for Food Packaging Applications

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