CHEMICAL ENGINEERING JOURNAL
·
2024
·
IF 13.3
Zongsheng Liu,Yi Zheng,Bangdong Ge,Meng Ma,Si Chen,Yanqin Shi,Huiwen He,Yulu Zhu,Xu Wang
In order to further advance the development of transparency, fire safety, and high-performance thin-walled polycarbonate (PC), it is essential to avoid the negative impact of traditional flame retardants on the overall performance of PC. In this work, a new copolymer polycarbonate (ASPC) containing sulfonyl diphenol monomer was synthesized by interfacial polycondensation, and it was used as a flame retardant for PC. Due to the fact that the compounds containing sulfonic acid groups produced by the decomposition of ASPC in a high temperature environment promote the crosslinking and rearrangement of PC, the PC can generate a denser char layer during combustion, thus effectively preventing the exchange of heat and gas inside and outside the matrix. To addition of 20 wt% ASPC can make PC with a thickness of 1.5 mm to pass the UL 94 V-0 rating and LOI increased to 33.5 %. The peak of heat release rate (PHRR) and smoke produce rate (PSPR) of PC/ASPC-20 was decreased by 32.4 % and 38.4 %, respectively. More importantly, the addition of ASPC can delay the speed of flame spread, provide people with more escape time and reduce the fire hazard. Furthermore, the ASPC is good compatibility with PC due to the structural similarity between ASPC and PC. Therefore, PC/ASPC maintains the comparable transparency and tensile properties of PC. The transmittance of PC/ASPC-20 is 87.7 %, and the elongation at break is 32.5 % higher than that of PC. This work provides a new solution for the preparation of flame-retardant modification of transparent and thin-walled PC, and expands the application scope of PC composites.
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
ACS Sustainable Chemistry & Engineering
·
2024
·
IF 7.1
Yaning Wang,Ruimin Xie,Jielin Xu,Zhenguang Li,Mingfa Guo,Fenghuan Yang,Jing Wu,Huaping Wang
Bisphenol-A polycarbonate (BPA-PC) has been widely used, but it has been restricted from use in several food-contact products due to the estrogen-like and antiandrogen effects of BPA. With the aim of developing novel, biobased, and ecologically safe high-performance polycarbonates with the potential to replace BPA-PC, in this work, a series of novel biobased copolycarbonates, viz., poly(isosorbide carbonate-co-isoidide-2,5-dimethylene carbonate) (PIsIeC), were designed and successfully synthesized via melt polymerization. The combination of two isohexide building blocks, the highly rigid isosorbide (IS) and the semirigid isoidide-2,5-dimethanol (IIDML), afforded an optimal candidate (PIsIeC-39) with a nice balance of high Tg (120.5 °C), high tensile strength (72.6 MPa), and also a high elongation at break (75.2%), which are comparable or even surpass the properties of BPA-PC and a few oil-based commercial benchmarks. The SEC/viscosity results and also a DFT simulation jointly revealed that the molecular weights of these copolycarbonates were significantly enhanced when using the two isohexide building blocks together due to a possible autocatalytic effect induced by the hydrogen bonding between IIDML and IS. These polymers were obtained with number-average molecular weights of 27,300–113,200 g/mol and intrinsic viscosities of 54–83 mL/g, which are also comparable to those of BPA-PC. Meanwhile, all copolycarbonates have good transparency similar to BPA-PC and also exhibit similar γ-relaxation and higher biobased content (72–84%). These biobased copolycarbonates with superior thermal and mechanical properties have high potential to be an ecologically safe alternative for BPA-PC.
研究领域:
材料科学
·
环境科学
·
化学工程
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF APPLIED POLYMER SCIENCE
·
2016
·Vol. 134
·期 9
·
IF 1.866
Lili Su,Wenqin Lai,Jin Yan,Guozhang Wu
In this study, we investigated the influence of the small molecule 4,4′-thiobis(6- tert -butyl- m -methyl phenol) (AO300) on the miscibility of poly(isosorbide- co -1,4-cyclohexanedimethanol carbonate) (I c C–PC) with bisphenol A polycarbonate (BPA–PC) through the formation of hydrogen-bonding networks. Differential scanning calorimetry and morphological observation revealed that the initially, immiscible BPA–PC/I c C–PC blends become miscible through the addition of small molecules. Fourier transform infrared spectroscopy confirmed that intermolecular hydrogen bonds formed between the hydroxyl groups of AO300 and the carbonyl groups of the studied polycarbonates. These polycarbonates exhibited different hydrogen-bonding behaviors and various degrees of glass-transition temperature composition dependence. Dynamic mechanical analysis demonstrated that AO300 played an antiplasticization role in the BPA–PC/I c C–PC blends with improved storage moduli. To our knowledge, this article is the first to describe the miscibility of isosorbide-based polycarbonate with BPA–PC. © 2016 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2017 , 134 , 44537.
研究领域:
高分子科学
·
材料科学
✓ 已验证
DOI
高影响因子
Materials
·
2020
·Vol. 13
·期 16
·3550
·
IF 3.057
Xiaodong Lu,Qiang Yao,Weihong Cao,Tianbo Tang
An extremely efficient flame retardant with low water solubility has been developed for bisphenol-A based polycarbonate. Potassium trimethylsilylbenzenesulfonate (KTSS) combining trimethylsilyl and sulfonate groups in its molecule is 7 times less water soluble and 5 times more effective in flame retardancy than potassium benzenesulfonylbenzenesulfonate (KSS), the commercial workhorse for polycarbonate (PC). At a loading of 0.02%, KTSS enables PC to achieve a solid UL-94 V0 rating and a limiting oxygen index (LOI) value of 34.4%, representing an increase of 8.5 units. The extremely high efficiency of KTSS stems from its great migration ability to the burning polymer surface facilitated by trimethylsilyl group, its timely release of active alkaline species that promote the charring process of PC, and the stabilization of char by silicon. In addition to the exceptional flame retardancy, PC/KTSS retains excellent physical properties of PC.Keywords:polycarbonate;flame retardant;sulfonate salts;silicon
研究领域:
材料科学
·
化学工程
✓ 已验证
产品关联
DOI
PubMed
高影响因子
INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
·
2024
·
IF 3.8
Zhencai Zhang,Zifeng Yang,Ming Jiang,Wenjuan Fang,Heng Wang,Chenhao Li,Xin Yao,Zengxi Li,Fei Xu
The utilization of biomass to produce plastic is one of the key ways to minimize the negative impacts of climate change and alleviate the depletion of petroleum resources. However, there is still a lack of bioderived polymers with properties comparable to those of commercial petroleum-based polymers. Isosorbide-based polycarbonate (PIC) is the most promising substitute for traditional petroleum-derived polycarbonate, but its application is still limited by the low reactivity and poor ductility of isosorbide. In this study, we developed a new strategy for designing functionalized ionic liquid catalysts enhanced by the cation–π interactions, and high performance isosorbide-based copolycarbonate was prepared. On the one hand, PIC with high weight-average molecular weight of 126,000 g/mol was synthesized by using 1-benzyl-3-methylimidazolium acetate ([Bnmim][OAc]) as a catalyst. This was attributed to the formation of stronger π–π interactions between the benzyl group and the imidazolium cation, which promoted the activation of carbonyl groups and overcame the low activity of isosorbide. Furthermore, to overcome the brittleness of PIC, the introduction of 1,10-decanediol into PIC provided not only copolycarbonates with an adequate elongation at break (121%), which was better than bisphenol A polycarbonate, but also copolycarbonates with a wide range of glass transition temperature (Tg 20–168 °C), expanding the application of PIC. This study provides an avenue for the development of excellent performance biobased polycarbonates using ionic liquid catalysts.
研究领域:
材料科学
·
绿色化学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF POLYMER RESEARCH
·
2023
·Vol. 30
·期 8
·1-7
·
IF 2.8
Wu Fang,Pu Zejun,Hou Hongbo,Li Xianyong,Zhu Rongli,Wang Xu,Yu DaYang,Zhong Jiachun
Bioderived polycarbonate (ISB-PC) was synthesized via transesterification and polycondensation of isosorbide (ISB) and diphenyl carbonate (DPC) using lithium acetoacetone as a catalyst. The resulting ISB-PC exhibited high glass transition temperatures similar to bisphenol A polycarbonate (BPA-PC) and was thermally stable up to 350 ℃. The incorporation of isosorbitol into the polymer chain imparted an improved mechanical property of ISB-PC, such as a higher bending and tensile modulus and higher elongation at break. ISB-PC can be readily cast into transparent films with a tensile strength of 73.3 MPa and a tensile modulus of 534 MPa. ISB-PC displayed high UV transmittance and possessed blue fluorescence under UV irradiation. At the same time, ISB-PC also has strong anti-yellowing ability.
研究领域:
材料科学
·
化学工程
·
聚合物科学
✓ 已验证
DOI
高影响因子
JOURNAL OF POLYMER RESEARCH
·
2023
·Vol. 30
·期 6
·1-8
·
IF 2.8
Yu Dayang,Zhong Jiachun,Pu Zejun,Hou Hongbo,Li Xianyong,Zhu Rongli,Wang Xu,Wu Fang,Zheng Pan,Liu Jingyue
In this study, iso-sorbitol type polycarbonate (PIC) was synthesized with isosorbide (ISB) and diphenyl carbonate (DPC) as reactive monomers. The flexible co-monomers 1,4-butanediol (BDO) and 1,4-cyclohexane dimethanol (CHDM) were introduced to improve its property. Then, two iso-sorbitol type polycarbonate copolymers were obtained: Isosorbitol type polycarbonate copolymer (PIBC) containing 1,4-butanediol (BDO) and isosorbitol type polycarbonate copolymer (PICC) containing 1,4-cyclohexane dimethanol (CHDM). The results of 1 H-NMR and FT-IR demonstrated that the structures of PC, PIC, PIBC, and PICC synthesized by the experiment were consistent with the theoretical structures. The results of the characteristic viscosity test suggested that the copolymer with high relative molecular weight was successfully prepared. The results of DSC and TGA revealed that the introduction of a flexible copolymer increased the relative molecular weight of the copolymer, decreased the glass transition temperature, and exerted little effect on the thermal stability of the copolymer. The mechanical properties test results unveiled that PICC has good mechanical properties. Owing to its excellent mechanical and thermal properties, there is a broad application prospect of the PICC as a green polycarbonate material.
研究领域:
材料科学
·
绿色化学
✓ 已验证
产品关联
DOI
高影响因子
MOLECULES
·
2024
·Vol. 29
·期 3
·640
·
IF 4.2
Maoqing Chai,Guangqiang Xu,Rulin Yang,Hongguang Sun,Qinggang Wang
The accumulation of waste plastics has a severe impact on the environment, and therefore, the development of efficient chemical recycling methods has become an extremely important task. In this regard, a new strategy of degradation product-promoted depolymerization process was proposed. UsingN,N′-dimethyl-ethylenediamine (DMEDA) as a depolymerization reagent, an efficient chemical recycling of poly(bisphenol A carbonate) (BPA-PC or PC) material was achieved under mild conditions. The degradation product 1,3-dimethyl-2-imidazolidinone (DMI) was proven to be a critical factor in facilitating the depolymerization process. This strategy does not require catalysts or auxiliary solvents, making it a truly green process. This method improves the recycling efficiency of PC and promotes the development of plastic reutilization.
研究领域:
材料科学
·
环境科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
POLYMER DEGRADATION AND STABILITY
·
2018
·
IF 3.193
Mengshuai Liu,Jiao Guo,Yongqiang Gu,Jun Gao,Fusheng Liu
The application of ionic liquids in chemical recycling of waste polycarbonate (PC) via the simple hydrolytic strategy has shown great potential. Herein, a series of 1,8-diazabicyclo[5.4.0]undec-7-ene (DBU) based ILs were facilely synthesized and characterized, and could efficiently catalyze the hydrolysis of PC in the absence of transition metal and solvent. The catalyst structures and reaction conditions were optimized, and 100% PC conversion with 97% bisphenol A (BPA) yield could be obtained under the conditions of n (H 2 O)/ n (PC) = 3:1, n (Cat.)/ n (PC) = 0.1:1, 140 °C for 3.0 h. Based on the experimental results and in-situ FT-IR analysis of the PC residues and BPA product, a feasible molecular activation and catalytic pathway for [HDBU][LAc] catalyzed hydrolysis of PC was proposed.
研究领域:
化学
·
环境科学
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF APPLIED POLYMER SCIENCE
·
2023
·Vol. 140
·期 41
·e54513
·
IF 3
Boyu Cai,Qing Jiang,Wendi Xu,Luze Wang,Zhonglin Luo,Biaobing Wang
A nitrogen-rich DOPO-based phosphoramide (DPAPZ) was synthesized using aminopyrazine and 9,10-dihydro-9-oxa-10-phosphaphenanthrene-10-oxide (DOPO) as raw materials, and blended with polycarbonate (PC) through melting method. The chemical structure of DPAPZ was validated by FTIR, 1 H NMR and 31 P NMR. The presence of DPAPZ endowed PC/DPAPZ composites with better fire safety and smoke suppression. With the incorporation of 6 wt% DPAPZ, PC/DPAPZ-6 composite reached UL-94 V-0 rating and 30.2% of limiting oxygen index value. Simultaneously, the peak of heat release rate and total heat release of PC/DPAPZ-6 were reduced by 44.8% and 47.0% as compared with the pure PC, respectively. The DPAPZ displayed bi-phase flame retardant roles. In the gas phase, the decomposition of DPAPZ released phosphorus-containing free radicals acting as the quencher of reactive H·/OH· and nonflammable NH 3 diluting O 2 /combustible volatiles. In the condensed phase, the phosphorus-containing components were dehydrated into metaphosphoric acid or polymetaphosphate covering the surface to protect the PC matrix from further combustion, and to promote the formation of a dense carbon layer to interrupt the transmission of O 2 and volatiles between the combustion zone and the inner. The tensile strength of the composites displayed almost no change but the elongation at break decreased slightly with the addition of DPAPZ.
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 Crystallization
·
2020
·Vol. 3
·期 3
·e10130
·
IF 0
Dachuan Ding,Jingjin Luo,Jie Wang,Zixin Yu,Yuanfu Tian,Jinqiang Tan,Zhiyuan Song,Qian Tao,Tao Hu,Chonggang Wu
Ionized polyamide (PA)-66 was successfully prepared at room-temperature using HCl (0.31 mol%) and CaCl 2 (2.3 mol%), respectively. The PA-66 ionenes, compared with the non-ionized PA-66, are used as a nucleator along with cholesteryl nonanoate (CN) as an active plasticizer to improve poly(bisphenol-A carbonate) (PC) crystallization. The results show the PA-66-HCl heterogeneously nucleates PC more effectively than the PA-66-CaCl 2 . The possible rationale is that the strong ion-dipole interactions (IDIs) of the PA-66-HCl remarkably boost the PC/PA-66-HCl interfacial compatibility, which results in the formation of considerably finer and denser PA-66-HCl crystals with significantly enhanced nucleation efficiency. However, owing to its higher ion content, the PA-66-CaCl 2 seems to have much stronger IDIs with PC that the resulting compatibility (i.e., thicker amorphous interlayers) dramatically inhibits PC crystallization.
研究领域:
材料科学
·
高分子化学
✓ 已验证
DOI
Advanced Electronic Materials
·
2024
·Vol. 10
·期 9
·2400003
·
IF 5.3
Yumeng Xin,Yi Cheng,Lianhao Sun,Haidong Ren,Xiyue Mao,Ping Yu,Xinxin Ban,Yang Lou
Conductive fillers-embedded plastic polymer hybrid composites are crucial electronic materials in modern technologies owing to their tunable conductive properties, low density, and corrosion resistance. However, the application of traditional rigid inorganic conductive fillers-embedded plastic composites is constrained by their subpar electrical conductivity and mechanical properties. Consequently, liquid metals (LMs) including gallium and gallium-based alloys, have recently emerged as the preferred conductive flexible fillers over traditional rigid fillers. This work employs a solvent evaporation method and phase separation-induced conductivity mechanism. The resulting flexible and electrically conductive LM-polycarbonate (PC) film circuits demonstrate ultrahigh metallic conductivity, robust mechanical performance, excellent solvent recyclability, and notable processability. The fluidic nature of LMs and the superior mechanical properties of the PC polymer confer high electrical stability and durability to the LM-PC film circuits under diverse mechanical forces and environmental conditions. The LM-PC film circuits are exceedingly promising and apt for use as flexible conductors in contemporary electrical applications, including electricity transmission and underwater working.
研究领域:
材料科学
·
电子工程
✓ 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）