Effect of side groups on glass transition temperatures of Poly(ethoxy/phenoxy)phosphazenes: Prediction and synthesis

Wang, Jiachen; Zhanqiang, Li; Basharat, Majid; Wu, Shaojun; Zhang, Shuangkun; Zhang, Xinfang; Ma, Hanlin; Liu, Wei; Wu, Dezhen; Wu, Zhanpeng

doi:10.1016/j.polymer.2021.124068

Cited by 11 publications

(5 citation statements)

References 42 publications

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“…Compared to the control sample PI‐200 ( T g = 333 °C), the T g of PI films with quinoline derivatives decreased due to the graft of bulky side groups. [ 48 ] However, both PI‐4QL and PI‐NQL still exhibited T g above 290 °C, meeting the requirements for advanced packaging applications. These results suggested that NQL showed better thermal stability and was more conducive to protecting the thermal properties of PI films than QL.…”

Section: Resultsmentioning

confidence: 99%

Exploring the Impact of Blend and Graft of Quinoline Derivative in Low‐Temperature Curable Polyimides

Huang,

Lv,

Zhang

et al. 2023

Macromol. Rapid Commun.

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The utilization of accelerators has been a common approach to prepare low‐temperature curable polyimide (PI). However, the accelerators have gradually fallen out of favor because of their excessive dosages and negative effect on the properties of PI. In this work, a new strategy of introducing accelerators by grafting to eliminate these disadvantages is presented. A novel quinoline derivative named NQL was designed for this purpose, and an ultra‐low dosage of only 2.5 mol% was sufficient to prepare low‐temperature curable PI. The favorable low‐temperature curing effect of NQL was attributed to its strong alkalinity (pKa = 18.47) and electron‐donating ability (HOMO = ‐6.22 eV). At a curing temperature of 200 °C, the PI with 2.5 mol% NQL showed outstanding properties (Young's modulus of 5.73 GPa, elongation of 37.3%, tensile strength of 237 MPa and coefficient of thermal expansion of 16 ppm/K). In particular, NQL could even lower the curing temperature to 180 °C and the ultra‐low temperature curable PI film still retained excellent properties. These results demonstrate that introducing low‐temperature curable accelerators by partial grafting instead of blending is a promising way to furnish low‐temperature curable PI, and provide insights into the preparation of polyimide with high performance in advanced packaging.This article is protected by copyright. All rights reserved

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Section: Resultsmentioning

confidence: 99%

Exploring the Impact of Blend and Graft of Quinoline Derivative in Low‐Temperature Curable Polyimides

Huang,

Lv,

Zhang

et al. 2023

Macromol. Rapid Commun.

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“…All these aspects are crucial when these polymers are used to control drug release [ 80 ], in drug delivery applications [ 81 , 82 ], or as a microencapsulation material, as well as an immunoadjuvant [ 15 ]. In very recent work, Wang et al rationalized the effect of the side groups on the glass transition polymers starting from a system with 150 repeat units [ 83 ], but a great advance in the MD simulations has been made by Chen et al [ 84 ]. In this study, the DREIDING force field with the Lennard–Jones potential was used, and they obtained an in situ dynamic polymerization procedure to make, test, and tune the thermos-mechanical properties of polyphosphazenes via MD simulations, which was obtained.…”

Section: Synthesis and Characterizationsmentioning

confidence: 99%

Cyclo- and Polyphosphazenes for Biomedical Applications

et al. 2022

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Cyclic and polyphosphazenes are extremely interesting and versatile substrates characterized by the presence of -P=N- repeating units. The chlorine atoms on the P atoms in the starting materials can be easily substituted with a variety of organic substituents, thus giving rise to a huge number of new materials for industrial applications. Their properties can be designed considering the number of repetitive units and the nature of the substituent groups, opening up to a number of peculiar properties, including the ability to give rise to supramolecular arrangements. We focused our attention on the extensive scientific literature concerning their biomedical applications: as antimicrobial agents in drug delivery, as immunoadjuvants in tissue engineering, in innovative anticancer therapies, and treatments for cardiovascular diseases. The promising perspectives for their biomedical use rise from the opportunity to combine the benefits of the inorganic backbone and the wide variety of organic side groups that can lead to the formation of nanoparticles, polymersomes, or scaffolds for cell proliferation. In this review, some aspects of the preparation of phosphazene-based systems and their characterization, together with some of the most relevant chemical strategies to obtain biomaterials, have been described.

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“…However, as a thermal insulation material, the high glass-transition temperature ( T g ) of PDAP (about −10 to 8 °C) seriously affects the reliability of its storage and application in a wide temperature range for SRMs. − Therefore, reducing the T g value of PDAP is a concern of optimization research for extending its application. Wang et al tried to reduce the T g value of poly(bisphenoxy)phosphazene by introducing different ratios of the ethoxy substituents, while predicting the T gs and establishing the relationships among synthesis, structure, and T g based on simulations. Similarly, the introduction of n -butoxy side groups can effectively reduce the T g value of PDAP, and the higher yield residual carbon of poly(butoxy/aryloxy)phosphazene (PBPP) gives it the potential to become an ablative substrate .…”

Section: Introductionmentioning

confidence: 99%

Effects of Fluorinated Side Groups on the Insulation Performances of Polyphosphazenes with Organic Fiber Reinforcement

Zheng,

Wang,

Liu

et al. 2024

ACS Appl. Polym. Mater.

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Poly(diaryloxy)phosphazene (PDAP) possesses good ablative resistance properties, owing to unique charred layers formed during ablation, showing promising applications in aerospace thermal protection. However, the high glass-transition temperature (T g ) of PDAP insulations limits the application in elastomeric heat-shielding materials (EHSMs) that is a need for meeting the growing requirements of solid rocket motors such as low-temperature storage and application. In this work, we focused on improving the low-temperature resistance and ablation resistance of polyphosphazene composites. A class of ablativeresistant poly(octafluoropentyloxy/butoxy/aryloxy)phosphazene (PFBAP) with low T g was prepared by introducing flexible octafluoropentyloxy side groups into poly(butoxy/aryloxy)phosphazene (PBPP). The results showed that the octafluoropentyloxy side groups could improve the thermal oxidative stability, flame retardancy, and interfacial interaction of polyphosphazene. Compared with PBPP composites, the values of linear ablation rate, mass ablation rate, and charring ablation rate of PFBAP 2 (containing 11.86% octafluoropentyloxy side groups) composites were reduced by 65, 34, and 25%, respectively. The study on the ablation mechanism of PFBAP composites shows that the introduction of fluorinated side groups can not only improve the charring degree of insulations during ablation but also exert a flame-retardant effect in the gaseous phase, resulting in a denser and more coherent charred layer. This work demonstrates a way to develop lowtemperature and ablation-resistant polyphosphazene materials for potential thermal protection in the aerospace industry.

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Effect of side groups on glass transition temperatures of Poly(ethoxy/phenoxy)phosphazenes: Prediction and synthesis

Cited by 11 publications

References 42 publications

Exploring the Impact of Blend and Graft of Quinoline Derivative in Low‐Temperature Curable Polyimides

Exploring the Impact of Blend and Graft of Quinoline Derivative in Low‐Temperature Curable Polyimides

Cyclo- and Polyphosphazenes for Biomedical Applications

Effects of Fluorinated Side Groups on the Insulation Performances of Polyphosphazenes with Organic Fiber Reinforcement

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