Evaluation for most probable distance between adjacent amorphous molecular chains taking preferred orientation with respect to a spinning fiber

Yang, Wei; Bin, Yuezhen; Yuan, Yongjia; Matsuo, Masaru

doi:10.1016/j.polymer.2016.09.029

Cited by 5 publications

(3 citation statements)

References 54 publications

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“…The wide‐angle X‐ray diffraction patterns of the polymer fibers featured only a broad peak with a d ‐spacing of 4.75 Å, which is clear evidence for a purely amorphous polymer (see Figure S1, Supporting Information). We note that fully amorphous fibers comprising oriented polymer chains are rare and difficult to achieve . Due to the absence of crystalline features in the X‐ray diffraction patterns and DSC thermograms, we could not quantify orientation of fiber segments.…”

Section: Resultsmentioning

confidence: 98%

Processing of the Multifunctional Polymer Poly(phenylene methylene) into Fibers, Films, Foams, and Microspheres

Braendle

Ofner

Perevedentsev

et al. 2019

Macro Materials & Eng

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Poly(phenylene methylene) (PPM) has recently emerged as a promising multifunctional polymer, requiring straightforward one‐step synthesis to achieve high molar mass and featuring a range of attractive properties. Its processability, however, has not been explored in detail to date. Therefore, this study presents a comprehensive investigation of the processability of PPM into a wide range of forms by employing various polymer processing techniques. Thin fibers (diameter ≈100 µm) over 1 km in length and shorter thick fibers (diameter ≈1 mm) are produced by melt spinning. Although no crystallinity is observed, the fibers surprisingly exhibit pronounced birefringence. The capability for waveguiding red light within the fibers is also demonstrated. Furthermore, films with a broad thickness range, spanning nanometer to millimeter length scales, are fabricated using different approaches such as spin‐coating, hot pressing, and die casting. All films feature a very smooth and crack‐free surface topography. Additionally, freestanding foams of PPM are obtained by foaming highly concentrated solutions, and quasi‐monodisperse microspheres are prepared by a microfluidic high‐throughput emulsification. The material properties of these different specimen forms are investigated and discussed for implementation as products ranging from plastic optical fibers and light emitting diodes, to protective coatings and packaging, as well as insulators and separation membranes.

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Section: Resultsmentioning

confidence: 98%

Processing of the Multifunctional Polymer Poly(phenylene methylene) into Fibers, Films, Foams, and Microspheres

Braendle

Ofner

Perevedentsev

et al. 2019

Macro Materials & Eng

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show abstract

“…이는 고분자 섬유에 열 등의 충 격 등을 받게 되었을 때 쉽게 변형될 수 있다 [6]. 물론 각각 고분자가 가지고 있는 결정형 및 무정형 특징 에 따라서 섬유의 형태가 달라질 수 있다 [7]. 이러한 고분 자를 방사했을 때 완벽하게 연신이 되는 섬유가 되거나 부 분적으로만 연신이 되는 고분자가 만들어질 수 있다.…”

Section: 서 론unclassified

Manufacturing and Mechanical Properties of Epoxy Fibers Spinning using Anhydride and Amine Hardeners

Shin¹,

Kim²,

Park³

et al. 2016

Composites Research

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Commonly-used polymers are manufactured as versatile forms. Furthermore, continuous polymer fibers are recently manufactured using nylon or aramid fiber. One of common epoxy was also used to make polymer fibers. Bisphenol-A type was used as base epoxy whereas amine and anhydride were used as hardeners. Epoxy fibers was cured by stepping up the temperature to maintain the shape of epoxy fiber. Surface energy was measured to confirm the degree of interfacial adhesion by modified static contact angle method. After mechanical properties were measured via fiber tensile test, the evaluation of fiber fracture was proceeded. Tensile strength of epoxy fiber using amine type hardener was higher as 138 MPa than anhydride case as 70 MPa. Fractured surface exhibited different failure patterns at the cross-section.

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“…This paper reports on a new high-temperature thermoplastic foam based on the polymer poly(phthalazinone ether ketone) (PPEK). Since the early research on phthalazinone-based polymers in the late 90's, [20][21][22] numerous articles have been published, [23][24][25][26][27][28][29][30][31] with potential applications as membranes, high performance plastics, and composites that serve as structural materials for aerospace and automotive applications. The focus of this article is on PPEK whose structure is shown in Figure 1.…”

Section: Introductionmentioning

confidence: 99%

The preparation and thermomechanical properties of high‐temperature foams based on thermoplastic poly(phthalazinone ether ketone)

Yang

Shen²,

Velankar

2020

J of Applied Polymer Sci

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Poly(phthalazinone ether ketone) (PPEK) is an amorphous thermoplastic polymer with a high glass transition temperature (T g) exceeding 250 C. We describe the preparation of foams from PPEK and characterize their properties. PPEK foams were prepared using dichloromethane as a foaming agent. The foaming agent was swollen into discs of the PPEK, which were then foamed by heating. Foams could be prepared at temperatures far below the T g of the PPEK due to plasticization of the polymer by the foaming agent. Foams with densities ranging from 0.1 to 0.65 g/cm 3 were prepared. Their thermal conductivity and modulus (measured approximately by indentation tests) were found to decrease with density, and the trends were similar to those expected from existing models. The foams could be annealed at 200 C without collapse suggesting that they may be useful in structural or insulation applications where stability at high temperature is essential.

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Evaluation for most probable distance between adjacent amorphous molecular chains taking preferred orientation with respect to a spinning fiber

Cited by 5 publications

References 54 publications

Processing of the Multifunctional Polymer Poly(phenylene methylene) into Fibers, Films, Foams, and Microspheres

Processing of the Multifunctional Polymer Poly(phenylene methylene) into Fibers, Films, Foams, and Microspheres

Manufacturing and Mechanical Properties of Epoxy Fibers Spinning using Anhydride and Amine Hardeners

The preparation and thermomechanical properties of high‐temperature foams based on thermoplastic poly(phthalazinone ether ketone)

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