Coatings
·
2023
·Vol. 13
·期 10
·1726
·
IF 3.4
Lei Chen,Weiyu Luo,Yima He,Lizhen Huang,Jinjie Xu,Kaixin Li,Yonggang Min
The development of renewable polymers as alternatives to the petroleum-based ones has received significant attention due to the increasing depletion of fossil oil and the associated environmental concerns. In this study, a semi-biomass-based polyimide (PI) film was successfully synthesized, using biomass-derived furfural (HMFA) as one of the raw materials. A two-step approach was first developed for this process: (1) conversion of HMFA to 3,3,4,4-biphenyltetracarboxylic acid dianhydride (BPDA) and (2) polymerization of BPDA with p-phenylenediamine (PPD) to form a PI film. The fabricated PI film demonstrated excellent properties, such as a high thermal decomposition temperature up to 600 °C, a satisfactory glass transition temperature (Tg) exceeding 365 °C, a coefficient of thermal expansion (CTE) of ≈30 ppm/K, a tensile strength greater than 120 MPa, a dielectric constant value below 3.4, a dielectric loss value of less than 0.02, and a 24 h water absorption rate below 0.8%. These performances are comparable to the petrochemical-based PI. This work offers a promising strategy for utilizing biomass-derived materials in polyimide synthesis and would drive a new wave of advancements in polymer science.Keywords:furfural;BPDA;polyimide;biomass;renewable polymer
研究领域:
材料科学
·
聚合物化学
·
可持续材料
✓ 已验证
产品关联
DOI
高影响因子
POLYMER SCIENCE SERIES A
·
2023
·Vol. 64
·期 6
·653-661
·
IF 1
Jiang Taijun,Peng Jun,Wang Jin,Yang Jun,Zeng Guangsheng
Abstract The aim was to prepare copolyimide (BPDA/PMDA-PDA) films of low thermal expansion coefficient by incorporating 1,2,4,5-benzenetetracarboxylic anhydride (PMDA) into polymer backbones 3,3′,4,4′-biphenyltetracarboxylic dianhydride (BPDA)/ p -phenylenediamine (PDA). FTIR and WAXD were used to explore the chemical and physical microstructure of the PIs films. DMA, TMA and TGA were used to characterize the mechanical and thermal performance of the PIs film respectively. The results show that the smectic structure of the film was destroyed by introducing rigid PMDA groups. The free volume fraction of polymers reached its maximum value when 40 wt % PMDA was added. The glass transition temperature of the polymers increased from 330 to 430°C and the thermal decomposition temperature declined slightly with the addition of PMDA. The inflection point in thermal expansion coefficient (CTE) of the BPDA-PDA polymers in TMA test reached as high as 470°C. The glass transition temperature of the polymers increased but the service temperature range narrowed with the addition of PMDA. The optimized PMDA concentration to obtain a best CTE was 5% as was revealed by the experimental results. The insights obtained from the experiments indicated that excessive introduction of PMDA into the polymers could increase the glass transition temperature significantly. However, the operating temperature range may be reduced. This research could offer practical and valuable references to the application for co-PI films.
研究领域:
材料科学
·
化学工程
✓ 已验证
DOI
高影响因子
REACTIVE & FUNCTIONAL POLYMERS
·
2020
·
IF 3.333
Run Chen,Tianliang Hu,Yongqiang Li
Enrichment of radioiodine accompanied by nuclear fission threatens the health of humans, and efficient capture of iodine has attracted wide public attention in recent years. Here we report a crystalline mesoporous nitrogen-containing covalent organic framework (TAPB-BPDA COF) as a highly efficient iodine adsorbent, which is synthesized by imine condensation reaction between 1,3,5-tris(4-aminophenyl)benzene and 4,4′-biphenyldicarboxaldehyde. The TAPB-BPDA COF possesses permanent porous structure, high BET surface area of 1082 m 2 /g, excellent chemical and thermal stability and plenty of nitrogen in the skeleton as effective sorption sites. It displays remarkable adsorption of iodine in aqueous solution up to 988.17 mg/g at room temperature . The adsorption kinetics of iodine onto TAPB-BPDA COF is followed the pseudo-second-order kinetic model , and the adsorption isotherm fits well with the Langmuir model. The TAPB-BPDA COF adsorbs iodine through the weak interaction between the benzene ring on its backbone and iodine, and the electron transfer between nitrogen atoms and iodine promotes the adsorption process . Moreover, TAPB-BPDA COF still maintains efficient adsorption performance after five cycles. These results suggest the great potential of TAPB-BPDA COF as a designable porous to address the problem of nuclear fission waste contamination that threatens human health.
研究领域:
材料科学
·
环境科学
·
核工程
✓ 已验证
产品关联
DOI
高影响因子
HIGH PERFORMANCE POLYMERS
·
2022
·
IF 1.73
Qi Li,Sung S Park,Chang-Sik Ha,Shuai Yuan,Liyi Shi
In this work, a copolyimide (Co-PI) film with high transparency was prepared by the copolymerization of hexafluoroisopropylidene)diphthalic anhydride (6FDA), 3,3′,4,4′-biphenyltetracarboxylic dianhydride (BPDA), 2,2′-Bis(trifluoromethyl)benzidine (TFMB) and adamantane-1,3-diamine (DAA). The effects of DAA monomers on the optical, thermal, and mechanical properties of the co-PIs were discussed in detail. We found that the preparation of polyimide (PI) based on the combination of two dianhydrides and two diamines could obtain the co-PI film with excellent comprehensive performance due to the synergy between the -CF3 group, the aliphatic ring and the aromatic structure. Through the structure and composition optimization, the co-PI film with 1.30% DAA (Q3) has a Tg of 374oC, T5 higher than 530oC, T430 of 82% and the tensile strength higher than 145 MPa. These results indicate that the Co-PI films can be successfully utilized in the development of novel heat-resistant plastic substrates for the optoelectronic engineering applications.
研究领域:
聚合物科学
·
材料科学
·
光电子学
✓ 已验证
DOI
高影响因子
ACS Applied Materials & Interfaces
·
2022
·
IF 10.383
Shuai Zheng,Lei Jiang,Fan Chang,Changqi Zhang,Ning Ma,Xueqiang Liu
High-performance thermal insulating materials are highly desirable in several fields, especially for thermal insulation of buildings to reduce energy consumption. Owing to the remarkable thermal stability, high porosity, low density, and outstanding mechanical features, polyimide (PI) aerogels have attracted great attention. In this work, chemical cross-linked PI (CCPI) aerogels were fabricated via freeze-drying and thermal imidization, which possess outstanding mechanical properties, good thermal stability, and excellent thermal insulation characteristics. The chemically cross-linked structure can effectively inhibit shrinkage, while retaining the structural integrity, resulting in the lower density and lower shrinkage of the materials. In this paper, completely imidized and highly cross-linked polyimide aerogels were synthesized by using p-phenylenediamine (PDA), 3,3′,4,4′-biphenyltetracarboxylic dianhydride (BPDA), and the cross-linker 2,3,6,7,14,15-hexaaminotriptycene (HMT). The CCPI aerogels with excellent properties, such as covalently cross-linked chemical structure, low density (0.069 g/cm3), low volume shrinkage (10%), high decomposition temperature (Td5% = 587 °C), and low thermal conductivity (25 mW m–1K–1) are in high demand in the field of thermal insulation. This work furnishes a new method for the development of polymer-based thermal insulation materials for various prospective applications.
研究领域:
材料科学
·
化学工程
·
热能工程
✓ 已验证
产品关联
DOI
PubMed
高影响因子
危险品化学品经营许可证（带存储）