Polymers
·
2019
·Vol. 11
·期 5
·803
·
IF 3.164
Feng Bao,Fengfeng Zhang,Chenghao Wang,Yuanyuan Song,Nan Li,Jinyan Wang,Xigao Jian
The application of poly(phthalazinone ether ketone)s (PPEKs) resin containing phthalazinone moiety is limited, due to its poor thermoforming processability. To investigate the effects of the phthalazinone’s side-group on the thermal stability and processability of the resin, a series of PPEKs resins with different side-group (–H/–CH3/–Ph) were prepared by nucleophilic aromatic substitution polymerization. The properties of the obtained resins were investigated by differential scanning calorimetry analysis (DSC), thermogravimetric analysis (TGA), dynamic thermomechanical analysis (DMA), and rheogoniometer. The results show that the introduction of methyl or phenyl into the PPEKs resin, significantly reduced the melting viscosity of the resin, but resulted in a slight decrease in the thermal stability of it. This might be due to the presence of methyl or phenyl, which enhanced the free volume of the molecule and reduced the entanglement between the chains; the results of the computer simulation confirmed it. Moreover, the resin films displayed excellent tensile strength with the introduction of methyl or phenyl. In a word, a novel poly(phthalazinone ether ketone)s resin with thermal resistance, easy processing and excellent mechanical properties could be obtained by introducing appropriate bulk-rigid side-groups into the phthalazinone moiety.Keywords:phthalazinone;side-group;thermal properties;processability
研究领域:
材料科学
·
高分子化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF APPLIED POLYMER SCIENCE
·
2020
·Vol. 138
·期 1
·49640
·
IF 2.52
Chunyan Qu,Yao Tang,Dezhi Wang,XuPeng Fan,Hongfeng Li,Changwei Liu,Kai Su,Daoxiang Zhao,Jiaqi Jing,Xiao Zhang
Limitations in the properties of polyamide PA66, such as low glass transition temperature and high water absorptivity, limit its applications. Introduction of amorphous polyimide segments into the PA66 main chain lowers the glass transition temperature and melting temperature and also improves its processability. PA66-polyimide (PA-PI) copolymers with different weight ratios of PI are prepared by high temperature and high-pressure solution polymerization. The degree of crystallization of PA-PI copolymers decreases with increasing PI content. The melting point decreases from 261°C for PA66 to 223°C for PA-PI-4. Dynamic mechanical analysis shows that the T g increases from 70 to 90°C, and the storage modulus can be well maintained. Rheological studies show that the temperature for processing can reach 70°C. Copolymers with different PI contents show different processing viscosities. In addition, water absorptivity (about 1.8%) and dielectric constant values of PA-PI and PA6/6T are similar.
研究领域:
材料科学
·
高分子化学
✓ 已验证
产品关联
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2022
·
IF 16.744
Yuanhao Ma,Haoxiang Rong,Yanan Zhang,Xun Lu
Achieving robust, high elasticity, transparency, self-repairing, reprocessability and durability simultaneously remains a huge challenge. In this work, we propose a simple strategy to prepare an ultra-high strength, outstanding elasticity, self-repairing and reprocessable poly (thiourethane-urea) (PTUU) film based on interlocking hydrogen bonds (IHBs) and reversible topological networks. The IHBs between its main chains make it have ultra-high tensile strength (61.6 MPa) and good scratch resistance. It is the highest tensile strength ever recorded for crosslinked self-repairing materials at medium temperature thus far. The synergistic effect of IHBs and topological networks makes it high elasticity and can repair more than 90 % of the mechanical strength. Rearrangement of reversible topology network at high temperature endows PTUU with reprocessability, and the mechanical strength remains more than 85 % after reprocessing for three times. In addition, PTUU films have high transmittance (96.6 %, 0.5 mm), low haze, high refractive index and excellent durability, which have broad application prospects in transparent protective materials, optical lenses, stretchable fibers, wearable electronic devices and other fields.
研究领域:
材料科学
·
化学工程
✓ 已验证
产品关联
DOI
高影响因子
POLYMER
·
2024
·
IF 4.1
Zichun Ding,Siying Wang,Runze Liu,Yuhang Wang,Jianing Guo,Xuedong Wu,Jiaming Wang,Xigao Jian,Lishuai Zong,Jinyan Wang
Phthalonitrile (PN) resin is renowned for its absence of small molecule release during curing, high processing stability, and exceptional thermal stability, positioning it favorably in the realm of high-temperature resin applications. However, its narrow processing window and high melting point present challenges to its development and practical use. To address these limitations, this work synthesized PN prepolymers 4,4′-bis (sulfonylbiphenyl) thiophtalonitrile (BSPS) and 4,4′-bis(carbonylbiphenyl) thiophtalonitrile (BSPC) by introducing thioether bonds as a substitute for ether bonds, aiming to expand the prepolymers' processing window. Meanwhile, building upon the oxidation process of thioether to sulfone observed in pharmaceutical production, the potential for in-situ oxidation of thioether bonds during the curing of phthalonitrile prepolymers was investigated. A comprehensive analysis of the curing behavior, viscosity changes, and thermal stability was conducted using differential scanning calorimetry (DSC), rheological analysis, and thermogravimetric analysis (TGA). The DSC and rheological test results reveal that the experimental group prepolymers BSPS and BSPC exhibit lower melting points (BSPS 179 °C; BSPC 180 °C) and broader processing windows (BSPS 52 °C; BSPC 79 °C) than blank. Additionally, the thermal performance of resins show improvement over the blank, with BSPS achieving a decomposition temperature of up to 530 °C ( T d5% ). XPS analysis of the curing process confirmed that the enhanced thermal stability is attributable to the partial oxidation of thioether bonds into stable sulfone groups. This innovative structural approach allows for satisfactory processing performance in the initial stage, followed by a spontaneous transformation into a more robust and thermo-resistant structure post-shaping. This finding carries significant implications for the development of a balanced phthalonitrile system that harmonizes processing ease with superior thermal endurance.
研究领域:
材料科学
·
化学工程
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF APPLIED POLYMER SCIENCE
·
2025
·
IF 2.8
Tao Wang,Jiajia Ye,Shuning Liu,Xiaobo Liu,Lifen Tong
Melamine-based benzoxazine resins overcome the disadvantages of conventional polybenzoxazine, such as high brittleness and difficult processing. However, the reactivity is too high to be easily processed. In this work, phenolphthalein-type melamine-based benzoxazine (PTma-BG) was synthesized from paraformaldehyde, phenolphthalein, melamine, and benzeneguanoamine. The chemical structure of PTma-BGs was characterized by fourier transform infrared spectroscopy (FTIR) and proton nuclear magnetic resonance ( 1 H NMR), and the curing behavior and properties of the resulting polymers were verified. The results demonstrate that the incorporation of benzeneguanoamine facilitates the formation of the oxazine ring while simultaneously reducing the reactivity of the PTma-BGs precursor, prolonging the gelation time, and expanding the processing window. Poly(PTma-40BG) has good thermal stability; it has been observed that the T d5 of Poly(PTma-40ma) reaches 328°C, which is higher than that of Poly(PTma). Furthermore, Poly(PTma-BG)s demonstrate exceptional heat resistance, with a glass transition temperature exceeding 285°C. The introduction of benzeneguanoamine results in a reduction in the number of polar groups, which in turn leads to a decrease in both water absorption and dielectric constant.
研究领域:
材料科学
·
化学工程
✓ 已验证
产品关联
DOI
高影响因子
POLYMERS FOR ADVANCED TECHNOLOGIES
·
2024
·Vol. 35
·期 8
·e6547
·
IF 3.1
Xiao-qin Feng,Yi Wang,Xun Dai,Xiao-dong Liu,Yuan Liu
Flexible electronics are striving in modern society, and they impose harsh and urgent requirements for flexibility on electronic package substrates. However, traditional materials, including ceramics, metals, or polymers are lack of flexibility. Herein, a polyurethane named PU-D1Q1VF1 is proposed via incorporating carefully selected biobased units and synergistic dynamic bonds, and the PU-D1Q1VF1 not only meets the basic requirements of flexibility but also possesses properties of self-heal, UV-protection, reprocessability, and degradability. The polycaprolactone diol (PCL diol) was employed as the soft segment, and the bis(2-hydroxyethyl) disulfide (HEDS) and lignin derived model monomer hydroquinone were selected as chain extenders. Moreover, carefully synthesized bio-based monomer (E)-4-(((furan-2-ylmethyl)imino)methyl)-2-methoxyphenol (VF) was used as the capping agent, which could facilitate the self-healing process of the PU-D1Q1VF1.
研究领域:
材料科学
·
生物基材料
✓ 已验证
产品关联
DOI
高影响因子
ACS Sustainable Chemistry & Engineering
·
2025
·
IF 7.3
Yuzhu Chen,Chao Zheng
Thermosensitive polymer solutions and hydrogels show great potential for thermochromic windows. However, current research often overlooks two critical factors: thermal stability under heating and processability, which are typically contradictory. This study develops a physically cross-linked hydrogel specifically for thermochromic smart windows, aiming to achieve an optimal balance between these two factors. The hydrogel is made from low-cost, environmentally friendly materials, using commercial block polyether (L62) combined with a poly(vinyl alcohol)-borosilicate network. By optimizing PVA and borax concentrations at 2 and 0.3%, the hydrogel demonstrates good thermal stability, showing no significant changes after repeated heating to 60 °C for 9 h. Additionally, it exhibits excellent processability, allowing it to flow and fill gaps between glass slides when heated. The transition temperature for transmittance and solar modulation can be easily adjusted by varying the concentration of L62. The resulting hydrogel achieves tunable transition temperature, high luminous transmittance (71.2%), solar modulation efficiency (72.2%), and excellent durability. Compared to air-sandwiched windows, these thermochromic smart windows exhibit a significant cooling effect, with temperature responsiveness contributing up to 50%, depending on hydrogel thickness. This work addresses key issues that will advance the industrial application of hydrogel-derived thermochromic smart windows.
研究领域:
材料科学
·
化学工程
✓ 已验证
产品关联
DOI
高影响因子
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
·
2020
·
IF 3.99
Houchao Jing,Jianping Shi,Peipei Guoab,Shuang Guan,Hai Fu,Wei Cui
In this work, hydrogels based on polyvinyl alcohol (PVA), acrylamide (AM), calcium chloride, and ι-carrageenan were prepared via radical polymerization followed by freezing and thawing process. Comparing with pure PVA hydrogels, the obtained hydrogels possess higher tensile strength (1.54 MPa), Young’s modulus (92 kPa), and breaking energy (5.14 MJ/m 3 ) due to the synergistic effect of physical cross-linkers containing PVA crystallization, double helix structures of carrageenan and hydrogen bond. Furthermore, the tensile stress of the hydrogel is negligibly changeable after twenty successive loading-unloading tensile tests under different strain demonstrating good fatigue resistance. And the hydrogels can also be recast many times under high temperature, which is favorable for the reuse of materials. Besides, the directional motion of ions endows the hydrogels with electronic conductivity which is very sensitive to the strain deformation. Together with the good mechanical property the hydrogels may have the promising application in flexible sensors.
研究领域:
材料科学
·
生物医学工程
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF APPLIED POLYMER SCIENCE
·
2021
·Vol. 139
·期 17
·52041
·
IF 3.125
Zhiyuan Song,Jie Wang,Qian Tao,Yang Yu,Hui Zhang,Chuanqun Hu,Hongyu Cen,Xuan Zheng,Tao Hu,Chonggang Wu
Zn-salt poly(styrene– ran –cinnamic acid) (SCA–Zn) ionomers were successfully synthesized via the melt neutralization of poly(styrene– ran –cinnamic acid) (SCA), which has a comparable molecular weight ( = 217,000) to commercial polystyrene (PS), with different mass fractions of ZnO (0.62, 1.6, and 3.9 wt.%) and the successful synthesis was confirmed by Fourier transform infrared spectroscopy. The mechanical properties, heat resistance, and processibility of the PS, SCA, and SCA–Zn samples were characterized. Compared to SCA, the three SCA–Zn ionomers exhibited significantly higher α cN values, with the ionomers containing 1.6 and 3.9 wt.% ZnO were 11.4% and 68.6% higher than that of SCA, respectively. Compared to commercial PS, SCA–Zn also exhibited significant improvements in heat resistance (glass transition temperature and vicat softening temperature both improved by about 20 °C) and impact toughness ( α cN values of the ionomers containing 1.6 and 3.9 wt.% ZnO were 69.6% and 156.5% higher than that of PS), while the processability of SCA–Zn was not significantly worse than that of PS. This method efficiently improves both the toughness and heat resistance of PS, providing an efficient way to expand the market application of styrenic resins.
研究领域:
高分子材料
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
POLYMER
·
2018
·
IF 3.483
Ning-Bo Li,Meng Wang,Ling-Xiang Guo,Bao-Ping Lin,Hong Yang
New generation spacecraft technology requires more and more deployable, light-weight, thin polymer films , in particular novel polyimide materials with high optical transparency, excellent foldability and superior flexibility. In this work, we develop a highly transparent, ultra-foldable, ultra-flexible and ultra-processable polyimide composite material by incorporating 5–8 wt% of ionic liquid 1-ethyl-3-methylimidazolium bis((trifluoromethyl)sulfonyl)imide into colorless polyimide matrices. This 23-μm-thick polyimide composite film exhibits a high optical transmittance of 90.4% even at 450 nm wavelength and an incredibly low cutoff wavelength of 273 nm. It is an extremely strong and flexible material, with a tensile modulus of 844.6 MPa, a tensile strength of 48.2 MPa, a high elongation at break of 108.4%, and an extraordinary minimum bend radius of 1 μ m. It can be easily folded in half 4 times or twisted by 900° without any crack damages. Moreover, it has a low expense cost and good film processability for industrialization manufacturing. All of these superior performances render this ionic liquid/polyimide composite an ideal structural material for solar sails, solar arrays and thin-film photovoltaics , etc.
研究领域:
材料科学
·
航天工程
·
高分子化学
✓ 已验证
产品关联
DOI
高影响因子
Journal of Materials Chemistry A
·
2022
·Vol. 11
·期 3
·1351-1360
·
IF 14.511
Deqi Wang,Jie Liu,Tianyu Tan,Shishuo Liu,Guozhen Xu,Zhimiao Zhang,Yang Qin,Fengsheng Li
Boron (B) is the most suitable fuel for rocket ramjet. However, boron oxide (B2O3) on the surface of B causes many problems in its application. B2O3 cross-links with hydroxyl prepolymer, which reduces the processibility of the system. Moreover, B2O3 hinders contact between the oxidation component and internal active B. Consequently, B is difficult to ignite, and its reactivity and combustion efficiency are limited. To solve these problems, a dual-core–shell structure, B@LiF@AP, B embedded with LiF as core and AP as shell, has been designed and prepared. Its multi-effect synergies, improving processibility, protecting B from oxidation by AP before burning, decomposing B2O3, and improving reactivity and combustion efficiency, have been confirmed. Compared with the mixed sample of B and AP (B–AP), the heat release of B@LiF@AP increased by 211.10%. The combustion efficiency of B@LiF@AP increased by 42.60% more than that of B@AP. The ignition test showed that its ignition energy was reduced by 37.89% and the flame temperature increased by 26.27% than that of B–AP. The application and development of boron-based rocket ramjet will be accelerated because the application problems of B are solved by B@LiF@AP.
研究领域:
材料科学
·
航空航天工程
✓ 已验证
产品关联
DOI
高影响因子
EUROPEAN POLYMER JOURNAL
·
2022
·
IF 5.546
Gaojie Wu,Zichen Wang,Yucheng Zi,Shengli Qi,Guofeng Tian,Dezhen Wu
In order to prepare polyimide resins with excellent melt processing properties and high transmittance, a series of thermoplastic fluorinated polyimide resins was prepared by copolycondensation of the flexible dianhydride monomer 4,4′-(4,4′-isopropyldiphenoxy)bis(phthalic anhydride) (BPADA) and the fluorinated diamine monomer 2,2′-bis(trifluoromethyl)benzidine (TFMB) with different contents of fluorinated dianhydride 4,4′-(hexafluoroisopropyl)diphthalic anhydride (6FDA) or cyclobutanetetracarboxylic dianhydride (CBDA) via chemical imidization. The effects of the third monomer content on the melt processing properties, optical properties, heat resistance, and mechanical properties of the polyimide resins were systematically investigated. The minimum melt viscosity of the PI resins reached 630 Pa·s below 400 °C. The transmittance at 450 nm of PI sheets prepared by compression molding reached 77%, and the color was significantly lighter than the commercial thermoplastic resin ULTEM, indicative of excellent processability and optical properties. Besides, the PI resins displayed outstanding thermal performance with glass transition temperatures ranging from 224 °C to 242 °C, 5% weight loss temperatures higher than 520 °C in a nitrogen atmosphere, and coefficients of thermal expansion of 51.45–68.97 ppm/K. Moreover, the PI sheets possessed tensile strengths of 88.4–104.7 MPa.
研究领域:
材料科学
·
化学工程
✓ 已验证
产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）