Improved processability of<scp>PA66‐polyimide</scp>copolymers with different polyimide contents

Qu, Chengtun; Tang, Yao; Wang, Dezhi; Fan, Xiaodong; Li, Hongfeng; Liu, Changwei; Zhao, Daoxiang; Jing, Jiaqi; Zhang, Xiao

doi:10.1002/app.49640

Cited by 10 publications

(7 citation statements)

References 38 publications

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“…The CN stretching vibration (amide III) is primarily responsible for the absorption peak at 1296 cm −1 . The formation of the 856 and 639 cm −1 absorption peaks results from the CH on the benzene ring vibrating out‐of‐plane 24 . All of these distinctive absorption peaks agree with earlier studies of nylons.…”

Section: Resultssupporting

confidence: 89%

“…The formation of the 856 and 639 cm À1 absorption peaks results from the C H on the benzene ring vibrating out-of-plane. 24 All of these distinctive absorption peaks agree with earlier studies of nylons. The appearance of these characteristic absorption peaks proved the formation of amide groups in the product, indicating that the target products were synthesized basically.…”

Section: Characterizationsupporting

confidence: 88%

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Effect of copolymerization on the thermal characteristics and behavior of crystallization of biobased semi‐aromatic PA10T/10I

Zhu

Hou

et al. 2023

J of Applied Polymer Sci

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This work synthesized the pure poly (decamethylene terephthalamide) acid (PA10T) and a series of PA10T/10I through an efficient one‐pot melt polymerization method. The structures, thermal behavior, crystallization performance, and mechanical properties of PA10T and PA10T/10I were investigated by FT‐IR, DSC, TGA, POM, XRD, and mechanics performance testing, respectively. The thermal analysis demonstrates that the melting temperature of PA10T/10I gradually decreased with the increase of isophthalic acid (IPA) copolymerization proportions. Specifically, it was observed that, the Tm1 of pure PA10T was 299.5°C, while the Tm1 of PA10T/10I‐4 with a linear downward trend was 284.7°C. And the introduction of IPA copolymerization has an obvious beneficial effect on the thermal stability of PA10T/10I (Td,5 varied from 429.5 to 434.5°C) with a wider temperature range of processing, which could potentially be applied in high‐temperature scenes. POM and XRD were used to characterize the crystallization behavior of all samples further. It was discovered that although adding IPA did not alter the crystal structure of PA10T, it dramatically reduced the size of crystalline grains and increased the number of crystal nuclei. In addition, the copolyamides possess excellent mechanical properties, and the tensile strength of PA10T/10I varied between 42.91 and 46.89 MPa, the bending strength varied between 76.69 and 85.83 MPa, and the izod impact strength varied between 25.41 and 29.82 kJ m−2. Moreover, the influence of the IPA comonomer of copolyamides PA10T/10I on melting points, thermal stability, crystallization behavior, and mechanical characteristics was investigated. This work provides a reference for preparing biobased semi‐aromatic copolyamides PA10T/10I with outstanding processing performance, excellent thermal characteristics, and adjustable mechanical properties.

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Section: Resultssupporting

confidence: 89%

Section: Characterizationsupporting

confidence: 88%

Effect of copolymerization on the thermal characteristics and behavior of crystallization of biobased semi‐aromatic PA10T/10I

Zhu

Hou

et al. 2023

J of Applied Polymer Sci

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“…S1(b) † proved the successful generation of PI. 43 XPS was employed to determine the chemical composition on the h-BN platelet surface. As shown in Fig.…”

Section: Structural Analysismentioning

confidence: 99%

Polyhedral oligosilsesquioxane-modified boron nitride enhances the mechanical properties of polyimide nanocomposites

2022

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“…Aromatic polyimides (PIs) have been receiving attention as high-performance polymers because of their rigid imide and aromatic ring structures. They are classified as high-performance polymers and used widely in aerospace, membranes, microelectronics, and optoelectronics due to their excellent thermal and mechanical properties and chemical resistance. − For example, a PI powder prepared from pyromellitic dianhydride (PMDA) and 4,4′-oxydianiline (ODA) is a lightweight and heat-resistant compression-molding material. A commercial example of PMDA-ODA PI, DuPont Corporation’s Vespel SP-1 product, is machined into bearings or sealing parts that are used under extremely harsh conditions. − The compression-molding process ensures that the PI particles coalesce tightly, in what is called a sintering process. , The molecular weight, degree of crystallinity, and specific surface area of the PI powder are known to influence the sintering behavior. − …”

Section: Introductionmentioning

confidence: 99%

Preparation of Polyimide Powders via Hydrothermal Polymerization and Post-Heat Treatment for Application to Compression-Molding Materials

Jin

Choi

et al. 2022

ACS Sustainable Chem. Eng.

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Aromatic polyimides (PIs) are classified as highperformance polymers owing to their excellent thermal, mechanical, and chemical resistance, and they are used widely in aerospace, membranes, microelectronics, and optoelectronics industries. To synthesize aromatic PI powder in an environmentally friendly manner, a hydrothermal polymerization (HTP) method of heating dianhydride and diamine in distilled water in an autoclave has recently been suggested. However, the application of the hydrothermally synthesized PI powder has been very rare. In the present study, we first report the synthesis of hydrothermal PI powders and their application as compression-molding materials. A mixture of unreacted monomer salt (MS), oligoimide, and PI (MS/PI) powders was obtained in distilled water in an autoclave and thermally imidized to obtain a post-heat-treated polyimide (T-PI) powder with improved sintering behavior. The inherent viscosity, degree of crystallinity, and specific surface area of the T-PI powder were investigated for their suitability for compression molding. The mechanical properties of compression-molded specimens were observed to be affected by the properties of the T-PI powder. When the autoclave temperature was 140 or 160 °C, the T-PI powder showed effective sintering behavior. A tensile strength of 57.2−57.9 MPa, an elongation at break of 6.8−7.4%, and a density of 1.35−1.37 g/mL were achieved with the T-PI powder. Compression-molded specimens prepared with the T-PI powders showed excellent thermal properties and sufficient mechanical properties for use as thermally stable parts and shapes.

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Improved processability ofPA66‐polyimidecopolymers with different polyimide contents

Cited by 10 publications

References 38 publications

Effect of copolymerization on the thermal characteristics and behavior of crystallization of biobased semi‐aromatic PA10T/10I

Effect of copolymerization on the thermal characteristics and behavior of crystallization of biobased semi‐aromatic PA10T/10I

Polyhedral oligosilsesquioxane-modified boron nitride enhances the mechanical properties of polyimide nanocomposites

Preparation of Polyimide Powders via Hydrothermal Polymerization and Post-Heat Treatment for Application to Compression-Molding Materials

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