JOURNAL OF POLYMER SCIENCE PART A-POLYMER CHEMISTRY
·
2012
·Vol. 50
·期 24
·5170-5176
·
IF 3.919
Yue-Cheng Qian,Xiao-Jun Huang,Chen Chen,Ning Ren,Xu Huang,Zhi-Kang Xu
The thiol–ene radical addition reaction has been successfully used to synthesize polyphosphazene derivatives. Poly[bis(allylamino)phosphazene] with pendant allyl groups was reacted with different thiol reagents under UV irradiation. These thiol reagents include 1-pentanethiol, 3-mercaptopropionic acid, 3-mercapto-1,2-propane-diol, and 2,3,4,6-tetra-O-acetyl-1-thio-β- D -glucopyranose. 1 H NMR analyses confirm that the allyl polyphosphazene can be quantitatively modified by the mercaptans. In total, 100% conversion of the allyl groups was reached in <60 min toward the first three mercaptans, whereas about 80% conversion of the allyl groups was reached after 120-min reaction toward the thioglucose. This method is a facile route for the synthesis of functional polyphosphazenes without the needs for protection/deprotection procedures. © 2012 Wiley Periodicals, Inc. J Polym Sci Part A: Polym Chem, 2012
研究领域:
高分子化学
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
POLYMER DEGRADATION AND STABILITY
·
2016
·
IF 3.12
Bin Zhao,Wen-Jun Liang,Jun-Sheng Wang,Fei Li,Ya-Qing Liu
A novel flame retardant , named bisphenol-A bridged penta(anilino)cyclotriphosphazene (BPA-BPP), was successfully synthesized. Its chemical structure was characterized by Fourier transform infrared (FTIR), 1 H NMR and 31 P NMR. Then, different amounts of BPA-BPP were mixed with diglycidyl ether of bisphenol-A (DGEBA) to fabricate flame retardant epoxy resin (EP). Nonisothermal differential scanning calorimetry (DSC) and thermogravimetric analysis (TGA) tests were used to study the curing kinetics and thermal degradation behaviors of flame retardant EPs. The results of limiting oxygen index (LOI), vertical burning tests (UL-94) suggested that BPA-BPP exhibited good flame-retarded efficiency on the EP loaded with low phosphorus content. Compared with the neat EP, the LOI value of EP/9%BPA-BPP increased from 21.0 vol% to 28.7 vol%. Furthermore, the peak of heat release rate (PHRR), total heat release (THR), total smoke production (TSP) of the same sample, obtained from cone calorimetry, were declined obviously, suggesting excellent flame retardancy and smoke inhibition. The morphology and chemical structures of the char layers were analyzed by SEM, Raman and FTIR. The Py-GC/MS was used to investigate the pyrolysis behavior and flame-retardant mechanism of BPA-BPP. In the process of heating, aniline, diphenylamine and NH 3 were released from BPA-BPP in gaseous phase, and phosphorus-rich carbonaceous chars were left in condensed phase. BPA-BPP could promote EP to form intumencent protective char layers, enhancing flame retardancy of EP effectively.
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 RADIOANALYTICAL AND NUCLEAR CHEMISTRY
·
2019
·Vol. 321
·期 3
·1093-1107
·
IF 1.186
Ma Zhili,Wang Yanfei,Liu Mouwu,Luo YiGe,Xie Xiaoqing,Xiong Zeng
Poly(cyclotriphosphazene-co-4,4′-diaminodiphenyl ether) crosslinked microspheres with active amino groups on the surface were prepared by one-step precipitation polymerization method. The as-prepared material were characterized by means of FTIR, XPS, XRD, EDS and SEM. The effects of pH, time of contact, dosage, initial concentration and temperature on the adsorption of uranium(VI) by the crosslinked microspheres were studied, and the adsorption mechanism was elucidated. Under the optimized adsorption conditions, the adsorption removal efficiency reached 97.03%. The experimental results fit the Langmuir isotherm model and adsorption processes comply with the pseudo-second-order kinetic model. Thermodynamic data revealed that the adsorption behavior of uranium(VI) on the microspheres was spontaneous and exothermic.
研究领域:
环境科学
·
材料科学
✓ 已验证
DOI
高影响因子
POLYMER COMPOSITES
·
2024
·
IF 4.8
Wenqi Zou,Kaiqiang Luo,Jun Xu,Munan Qiu,Jing Tian,Zhanpeng Wu,Baohua Guo
In this study, the challenges of brittleness and flammability in Polyamide 6/glass fiber (PA6/GF) composites, which are crucial for heat-resistant and stress-bearing structural parts, are addressed. Polyphosphazene (PZ) elastomers, known for their exceptional flame-retardant properties, are introduced to enhance the robustness and safety of these composites. Specifically, poly(diaryloxy)phosphazene (PDAP) and poly(difluoroalkoxy)phosphazene (PDFP) are utilized, both contributing to the improved toughness and flame resistance of the PA6/GF composites. Experimental results show that PDAP mainly played the role of solid-phase flame retardant, while PDFP mainly acted the role of gas-phase flame retardant. For PA/PZs composites without adding GF, PDFP plays a more efficient flame retardant effect than PDAP. By introducing 15 Vol% of PDFP, the limiting oxygen index (LOI) of the composite reached 26.1%, while the notched impact strength increased by 297%. For PA/PZs/GF composites, PDAP plays a better flame retardant role than PDFP. Under the action of 30 vol% GF and 15 vol% PDAP, the LOI of PA6/PDAP/GF composite reached 26.8%, and the notch impact strength improved to 18.7 kJ/m 2 , which is 165% higher than that of PA6/GF, and the UL-94 test reaches V-0 level. The findings of the study highlight the potential of PDAP and PDFP to act as dual-function modifiers. These modifiers can considerably ameliorate both the impact resistance and flame retardancy of PA6 and PA6/GF composites. Such dual enhancement surpasses the typical trade-offs seen in conventional composites, indicating a constructive direction for future material innovation. Highlights Polyphosphazenes simultaneously enhance PA6's toughness & flame resistance. Distinct flame retardant mechanisms found in PDAP and PDFP. GF presence alters PDAP and PDFP's flame retardant efficacy. PDAP shows superior flame resistance in GF-reinforced PA6 composites. Without GF, PDFP outperforms PDAP in enhancing flame retardancy.
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
JOURNAL OF APPLIED POLYMER SCIENCE
·
2020
·Vol. 137
·期 32
·48937
·
IF 2.52
Kuiyong Chen,Yue Liu,Yongjian Hu,Meiyu Yuan,Xiuwen Zheng,Xiaobin Huang
Amino-functionalized highly crosslinked organic–inorganic hybrid polyphosphazene microspheres were prepared via a one-pot polycondensation method and served as a fluorescent sensor for the detection of Fe 3+ in solution. With the introduction of p -phenylenediamine unites, the polyphosphazene microspheres could be endowed with fluorescent property and abundant active amino groups on the surface. The microspheres were further used as the fluorescent sensor for the detection of Fe 3+ . Fluorescence study showed high sensing sensitivity and selectivity of the microspheres, and the limit of detection was determined as 0.076 μM for Fe 3+ . Active amino groups on the surface could efficiently improve the detection sensitivity of Fe 3+ . Moreover, highly crosslinked organic–inorganic hybrid structure was beneficial to the photostability and thermostability, enabled the microspheres to be possible for constructing practicable sensors. This work is expected to inspire the design of advanced polyphosphazene-based fluorescent sensors for applications in analytical detection. © 2020 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2020 , 137 , 48937.
研究领域:
材料科学
·
分析化学
✓ 已验证
DOI
高影响因子
JOURNAL OF POLYMER RESEARCH
·
2017
·Vol. 24
·期 4
·1-7
·
IF 1.615
Li Hu,Zhou Zhen,Liu Jingcheng,Zheng Xiangfei,Xu Wenjia,Ji Changwei,Shi Weidong,Liu Ren,Liu Xiaoya
Hexakis(4-formylphenoxy) cyclotriphosphazene (HAPCP), substitution reaction product of hexachlorotriphosphazene (HCTP) with p-hydroxybenzaldehyde, was reduced by sodium borohydride to afford hexakis[4-(hydroxymethyl) phenoxyl] cyclotriphosphazene (HHPCP). The hydroxyl group of this compound was then protected by the reaction with di-tert-butyl dicarbonate ester (DBDC) in the presence of 4-dimethylaminopyridine (DMAP) as catalyst to give t-butyloxy carbonyl (tBOC) protected HHPCP. Fourier-transform infrared spectroscopy (FT-IR) and proton nuclear magnetic resonance ( 1 H NMR) were employed to characterize the chemical structure, indicating that the synthesis was successful. Thermal behavior was characterized by thermogravimetric analysis (TGA), the results showed that the initial thermal decomposition temperature occurred at approximately 170 °C, X-ray diffraction analysis (XRD) results showed that the tBOC protected HHPCP derivatives had amorphous form, and performed excellent film-forming property. Upon irradiation to 365 nm exposure, the photoacid generated proton H + , which can catalyze the deprotection of acid labile tBOC group. This type of novel molecular glass photoresist based on hexachlorotriphosphazene showed high sensitivity, making it possible to fabricate 1 μm line and space pattern under i-line exposure.
研究领域:
材料科学
·
化学
·
半导体制造
✓ 已验证
产品关联
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2024
·
IF 13.3
Zhicheng Bai,Teng Huang,Jiahao Shen,Dan Xie,JinJia Xu,Junhui Zhu,Fengqing Chen,Wenbiao Zhang,Jinfeng Dai,Pingan Song
Polylactic acid (PLA) is inherent brittle, flammable, and susceptible to ultraviolet light irradiation, limiting its application in the field of engineering safety. Therefore, advanced PLA composites with toughness and flame retardancy as well as other exceptional engineering performance has garnered significant interest. In this work, a versatile additive (PAHP) was synthesized by nucleophilic substitution utilizing flexible chain (polyphosphazene) as the skeleton and rigid biomass compound (guanine) as a substituent, then fabricating all-in-one PLA composites. The PAHP plays a synergistic flame-retardant role in both the gaseous and condensed phases, improving the flame retardant performance of the composites while effectively enhancing the crystallization and mechanical properties of PLA. Only 5 wt% PAHP within PLA composite can meet the fire-safety requirements of engineering applications (V-0 rating of UL-94) and exhibits a ∼12-folds enhancement in toughness compared to neat PLA. Moreover, the PLA/5% PAHP composite shows excellent ultraviolet shielding effects, blocking approaching 100 % UV isolation under UV-B wavelengths. This work offers a scalable strategy for preparing multifunctional flame-retardant additives, opening up a great promise for the application of high-performance PLA engineering composites in packaging, electronic, and automotive.
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
EUROPEAN POLYMER JOURNAL
·
2019
·
IF 3.621
Teng Li,Shuai Li,Tongjun Ma,Yi Zhong,Linping Zhang,Hong Xu,Bijia Wang,Xueling Feng,Xiaofeng Sui,Zhize Chen,Zhiping Mao
A novel organic-inorganic hybrid polyphosphazene modified manganese hypophosphite (PZS-MnHP) shuttles was facilely fabricated and applied in enhancing the flame retardance and anti-dripping behavior of PET. The PET containing 5 wt% PZS-MnHP shuttles (PET/FR5.0) possessed a LOI value of 25.3% and corresponding melt-dripping was greatly restricted with few droplets. Incorporating 5 wt% PZS-MnHP shuttles also brought about dramatic decrease in the fire hazard of PET, for instance, 57.0% maximum reduction in heat release rate. Moreover, the tensile strength of PET/FR5.0 composite was gradually increased from 50.87 MPa to 55.68 MPa, relevant elongation at break was enhanced by 7.2% compared with that of PET. The flame-retardation mechanism of PZS-MnHP shuttles in PET was also systematically investigated. The results showed PZS-MnHP shuttles extremely accelerated the formation of intumescent char, cutting off the supply of external oxygen and heat. Moreover, inflammable gases including SO 2 and NH 3 released from PZS-MnHP shuttles efficiently diluted combustible organic volatiles in burning area, further blocking the spread of fire.
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
·
2020
·Vol. 31
·期 5
·997-1006
·
IF 2.578
Xinyao Lv,Wei Zeng,Zhiwang Yang,Yaoxia Yang,Yun Wang,Ziqiang Lei,Jinling Liu,Denglong Chen
A novel zeolitic imidazolate framework (ZIF-8) nanoparticles@polyphosphazene (PZN) core-shell architecture was synthesized, and then, ZIF-8@PZN and ammonium polyphosphate (APP) were applied for increasing the flame retardancy and mechanical property of epoxy resin (EP) through a cooperative effect. Herein, ZIF-8 was used as the core; the shell of PZN was coated to ZIF-8 nanoparticles via a polycondensation method. The well-designed ZIF-8@PZN displayed superior fire retardancy and smoke suppression effect. The synthesized ZIF-8@PZN observably raised the flame retardancy of EP composites, which could be demonstrated by thermogravimetric analysis (TGA) and a cone calorimeter test (CCT). The chemical structure of ZIF-8@PZN was characterized by X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), and transmission electron microscopy (TEM). Compared with pure epoxy, with the incorporation of 3 wt% ZIF-8@PZN and 18 wt% APP into the EP, along with 80.8%, 72.6%, and 64.7% decreased in the peak heat release rate (pHRR), the peak smoke production rate (pSPR), and the peak CO production rate (pCOPR), respectively. These suggested that ZIF-8@PZN and APP generated an intumescent char layer, and ZIF-8@PZN can strengthen the char layer, resulting in the enhancement in the flame resistance of EP.
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 POLYMER SCIENCE PART A-POLYMER CHEMISTRY
·
2012
·Vol. 51
·期 5
·1205-1214
·
IF 3.919
Xinjian Cheng,Cheng Peng,Daohong Zhang,Shuzheng Liu,Aiqing Zhang,Hui Huang,Jiansheng Lian
Novel cross-linked polyphosphazenes with remendable capacity have been synthesized through the Diels-Alder reactions. Their structure and properties were characterized by NMR, FT-IR, GPC, DSC, TGA SEM, and polarizing microscope. The process of Diels-Alder reaction (D-A reaction) and retro-Diels-Alder reaction (retro-D-A reaction) have been investigated by FT-IR, UV, and DSC. The cross-linked polyphosphazenes exhibited remendable capability only need a thermal treatment when they were cut by blade, any other treatments such as additional monomer or catalyst, surface treatment or pressure were not needed. © 2012 Wiley Periodicals, Inc. J Polym Sci Part A: Polym Chem, 2013
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
CHEMOSPHERE
·
2022
·
IF 8.943
Yuling Xiao,Xiaowei Mu,Siqi Chen,Guangyong Jiang,Zhoumei Xu,Chao Ma,Lei Song,Yuan Hu
As one of the most widely used polymers, the intrinsic brittleness and high flammability bring about a stringent requirement for the practical application of epoxy resins (EPs). It is difficult to toughen EP without compromising its mechanical and thermal properties for many conventional toughening agents. Here, a novel furan-derived bio-based polyphosphazene (PFMP) with a flexible backbone and rigid side groups was prepared by the nucleophilic substitution reaction between polydichlorophosphazene (PDCP) and furfuralcohol. The resultant PFMP was incorporated into EP to realize exceptional toughening, strengthening, and flame retardant function. By adding 15% of PFMP, the limit oxygen index value is from 25% (EP) to 33% (EP/PFMP-15) and reaches the UL-94 V-0 rating. According to the cone calorimeter results, EP/PFMP-15 exhibits exceedingly reduced peak heat release rate (pHRR) (50.2%) and total heat release (THR) (49.6%). The significantly increased fire performance index (FPI) and decreased fire growth rate index (FIGRA) of EP/PFMP-15 demonstrate an improvement in its flame retardancy. The catalytic carbonization effect (condensed phase) and radical quenching effect (gas phase) of PFMP account for the greatly improved flame retardancy. Moreover, the impact and tensile tests indicate that PFMP can ameliorate the mechanical performance of EP with a maximum increase of impact strength (111.8%) and elongation at break (35.2%) for EP/PFMP-5. With 15% PFMP added, the tensile strength of EP/PFMP-15 increases by 40.4%. This work demonstrates that PFMP is expected to overcome shortcomings (flammability, toughness, and strength) of EP and spread its applied fields.
研究领域:
材料科学
·
化学工程
✓ 已验证
DOI
PubMed
高影响因子
JOURNAL OF RADIOANALYTICAL AND NUCLEAR CHEMISTRY
·
2024
·Vol. 333
·期 6
·2735-2744
·
IF 1.5
Liu Zengcheng,Xu Yufen
In this paper, a two-step precipitation polymerization method was used to prepare a magnetic poly(cyclotriphosphazene-co-3,3′-sulfonyl dianilide) (MPSD) as an adsorbent for the removal of the radioactive element thorium(IV) in aqueous solution. The magnetic material was characterized and analyzed by FTIR, XRD, SEM, BET and VSM. The experimental results showed that the adsorption capacity of MPSD was 286.7 mg/g when pH was 4.0. And the adsorption process fitted the Langmuir model ( R 2 = 0.9991) and the pseudo-secondary kinetic model ( R 2 = 0.9997). At the same time, the thermodynamic data indicated that the removal of thorium(IV) by MPSD microspheres was a spontaneous endothermic process.
研究领域:
环境科学
·
材料科学
✓ 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）