POLYMERS FOR ADVANCED TECHNOLOGIES
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2021
·Vol. 32
·期 5
·2185-2196
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IF 3.665
Jiang Xiaolin,Qin Rui,Wang Minhui,Xu Min,Sheng Yeming,Lu Xun
Aiming at the common problems of weak controllability of damping temperature range and poor mechanical properties in damping elastomer materials. Herein, we design a polyurethane-containing dynamic disulfide bonds and dangling chains to address this dilemma. The as-prepared polyurethane exhibits an unprecedented damping range of 182°C (−62 to 120°C), and the tensile strength reaches 6.8 MPa, which is at the forefront of the same type of research. We innovatively introduce aromatic disulfides to the system, in which disulfide bonds can be spontaneously exchanged dynamically at room temperature, making the damping performance of the elastomer above room temperature improved, and a small amount of hydroxyl-terminated polydimethylsiloxane (OH-PDMS) is used as a dangling chain to promote the damping property of the elastomer between the glass transition temperature and room temperature. The synergistic effect of disulfide bonds and dangling chains makes the controllability of polyurethane damping temperature range realized. Furthermore, polyurethane elastomer is equipped with good thermal stability duo to the introduction of OH-PDMS. And, the high-performance polyurethane elastomer has great potential in practical application.
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DOI
高影响因子
POLYMERS FOR ADVANCED TECHNOLOGIES
·
2021
·Vol. 32
·期 8
·2899-2907
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IF 3.665
Yisen Huang,Yiran Kong,Liwei Yan,Huawei Zou,Yang Chen,Mei Liang
Ablation-resistant polymeric composites play a crucial role in the thermal protection system for the entire aerospace industry. Constructing a stable char layer especially with low thermal conductivity is essential to enhance the ablation resistant properties of polymer-based ablatives. In this article, basic magnesium carbonate (MgCO 3 ) and carbon fibers (CFs) were introduced to silicone rubber with an aim of building fiber-supported micro-porous char structure in situ, thereby improving ablation resistance properties. Thermogravimetric analyses revealed that the addition of MgCO 3 significantly increased the char residue of the composites. Oxyacetylene torch tests indicated that the addition of MgCO 3 /CFs greatly improved the thermal insulation of the composites, and the linear ablation rates of the composites were reduced by 30.76% compared to the virgin silicone rubber. Shore A hardness and thermal conductivity tests revealed that composites with 10 phr MgCO 3 exhibited a char structure with proper strength and low thermal conductivity. SiC, Mg 2 SiO 4 , and MgSiO 3 were produced in the MgCO 3 /CFs-modified composites, as characterized by X-ray diffraction. Combined with macro lens and scanning electron misroscopy, it was proven that a fiber-supported micro-porous and thermally insulated char structure was conducive to the improvement of the ablation properties, which can be applied to aerospace systems for thermal shielding applications.
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高影响因子
POLYMERS FOR ADVANCED TECHNOLOGIES
·
2021
·Vol. 32
·期 11
·4440-4449
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IF 3.665
Qianqian Guo,Yufan Yang,Lu Li,Jun Sun,Wei Liu,Xiaoyu Gu,Hongfei Li,Sheng Zhang
Polyethylene terephthalate (PET) fabric has been widely used in textile industry for decades. However, it faces poor flame retardant performance and dripping problem during burning. In our study, a novel intumescent flame retardant coating containing bio-materials ammonium phytate (APA) and cyclodextrin (CD) had been constructed on PET fabrics surface via pad-dry-cure method. The fire performance, mechanical properties and bio-safety of APA/CD coated fabric were evaluated. PET fabric coated with 19%APA/6%CD showed a limiting oxygen index value of 29.5% with self-extinguish from fire and no melt dripping during the vertical burning test. Cone calorimetry test revealed that treated PET fabric significantly suppressed heat release and mass loss. The peak heat release rate was decreased from 277.1 KW/m 2 of PET fabric to 158.3 KW/m 2 of PET-19%APA/6%CD sample. Furthermore, the residue of treated fabric after combustion was also increased significantly. Tensile strength test showed that the maximum force of fabric was improved by 109.5% in warp direction and 24.2% in weft direction after treatment. Skin irritation test indicated that APA/CD coated PET fabric did not cause erythema and edema to rabbit skin and exhibited satisfactory bio-safety. All these results suggest that this study proposes a viable way to produce bio-safety flame retardant PET fabrics.
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高影响因子
POLYMERS FOR ADVANCED TECHNOLOGIES
·
2021
·Vol. 32
·期 9
·3740-3749
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IF 3.665
Tianwen Dai,Shuaiwei Yuan,Huawei Zou,Pengbo Liu
A kind of four-functional epoxy resin containing tertiary ester groups (FETE) was designed and synthesized by two-step reaction: first, the nucleophilic substitution reaction between linalool and isophthaloyl chloride, and then epoxidation. The chemical structure of obtained product was determined by infrared (IR) spectroscopy and nuclear magnetic resonance spectroscopy. Unlike traditional thermosetting epoxy resins, the cured FETE could degrade rapidly at low temperature (200–300°C). Dynamic mechanical analysis analysis showed that through copolymerization of FETE with (4,5-epoxycyclohexane-1,2-dicarboxylic acid diglycidyl ester) epoxy resin (TDE-85), the glass transition temperature (Tg) of copolymer system could be adjusted in the range of 136–179°C; FETE had good miscibility with TDE-85. The thermal degradation behavior of the copolymer system was studied by theoretical calculation, thermogravimetric (TG), and TG coupled with FTIR analysis, the results showed the thermal decomposition performance of the copolymer system could be adjusted in the range of 200–400°C. The tertiary ester groups in FETE were easy to thermally degrade and caused the network skeleton of the copolymer system to collapse. The FETE would have good prospects in reworkable electronic packaging, recycling or degradable epoxy resin area.
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高影响因子
POLYMERS FOR ADVANCED TECHNOLOGIES
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2021
·Vol. 32
·期 8
·3194-3204
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IF 3.665
Hong-yan Niu,Li-qin Cao,Xu-le Yang,Kai-nan Liu,Lu Liu,Ji-de Wang
Here, the ZnO/polyacrylamide (ZnO/PAM) macroporous composite monolith was first prepared through the radical polymerization of acrylamide in ZnO-costabilized CO 2 -in-water Pickering high internal phase emulsions (HIPEs). An efficient and green synthesis method was used to prepare the ZnO/PAM porous precursor materials, and ZnO nanoparticles (NPs) were used as a metal ion source to grow the metal organic frameworks (MOF) phase through secondary recrystallization, thereby synthesizing the target MOF/PAM porous monolith. The effects of the contents of ZnO NPs on the formation of HIPEs and properties of the target MOF/PAM composites for the photocatalytic degradation of cationic dye were studied. As the content of ZnO NPs increased to 3.75 wt%, the composite monolith had high mechanical stress (0.24 MPa) at 80% strain and recovered their shape. The as-synthesized ZIF-8/PAM composites were characterized using X-ray diffraction, scanning electron microscope (SEM), Brunauer Emmett Teller (BET), energy dispersive X-ray spectrometer (EDS) mapping, and TG methods. SEM images showed that the hybrid materials were interconnected, and the sizes of the open macropore and interconnected pore throats were 30–125 and about 2–20 μm, respectively. In addition, the ZIF-8/PAM material could be used as a high-efficiency photocatalyst to remove the cationic dye at a fast rate (88.6%).
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高影响因子
POLYMERS FOR ADVANCED TECHNOLOGIES
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2021
·Vol. 32
·期 8
·3113-3122
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IF 3.665
Zhiming Chen,Weiqiu Wen,Jianwei Guo
Natural chitosan (CS) is composed of a larger hydrophilic skeleton with great biocompatibility. A hypoxia sensitive amphiphilic conjugate (CS-NBCF) was synthesized by conjugating CS with nitrobenzyl chloroformate (NBCF). Subsequently, nano micelles with high stability (CMC = 0.0030 mg/ml) were formed by self-assembly of the polymers in deionized water. The hypoxia-responsive function was demonstrated by examining the size variations of polymeric micelles under the hypoxia conditions. Doxorubicin (DOX) was encapsulated into the micellar core, the drug loading and encapsulation efficiency of DOX were 15.0% and 52.6%, respectively. The in vitro release experiments showed that DOX could be released rapidly in hypoxic environment, and the release amount was up to 68% in 24 h. It was found from the cytotoxicity experiment that that the toxicity of the blank micelles was low, while DOX-loaded micelles exhibited a good anti-cancer effect under hypoxic conditions, and the cell inhibition rate of MCF-7 was high up to 63%. As a result, the demonstrated properties endowed as-developed polymeric micelles with promising application as drug delivery system in tumor treatment.
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高影响因子
POLYMERS FOR ADVANCED TECHNOLOGIES
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2021
·Vol. 32
·期 9
·3436-3445
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IF 3.665
Wenya Zhang,Jingchun Lv,Bijia Wang,Linping Zhang,Yi Zhong,Xiaofeng Sui,Hong Xu,Zhiping Mao
Solar-driven seawater desalination is an environmental friendly technology that could relieve global water shortage. However, the practical applications of solar steam generating devices have been limited by the high energy consumption in the manufacturing process, low durability, and difficulties in large-scale production had limited. Herein, we designed and prepared a polyimide film coated with polypyrrole with graded porous structures (PPy@PI).The photothermal PPy@PI has excellent mechanical properties and thermal stability and requires no nondegradable supporting polymer foam to float in water, making it ideal for desalination applications. Importantly, PPy@PI-S prepared by single-sided deposition of polypyrrole on the surface of the polyimide film has high light absorption capacity (93.57%) and low thermal conductivity under wet conditions (0.3641 W m −1 k −1 ). Under the irradiation of 1 sun (1 kW m −2 ), the evaporation rate was up to 1.23 kg m −2 h −1 corresponding to a solar energy conversion rate of 84%.The simple preparation process enables large-scale preparation of PPy@PI.
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高影响因子
POLYMERS FOR ADVANCED TECHNOLOGIES
·
2021
·Vol. 32
·期 8
·3297-3308
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IF 3.665
Lin Xia,Qi Wang,Jiafeng Meng,Zhenguo Ma,Ping Zhao
A series of thermal and electro double-stimulus shape memory composites were processed using natural Eucommia ulmoides gum (EUG) and carbon nanotubes (CNTs). Mechanical, cure, and thermal properties were studied by universal testing machine, differential scanning calorimetry (DSC), and dynamic mechanical analysis (DMA), respectively. The shape memory behavior of the composites was explored via heat and electrical stimulation. The cross-linked network in the composites acted as a fixed domain, and the crystalline regions acted as a reversible domain during shape memory process. We studied the shape memory behavior of composites at different voltage and monitored the temperature change of composites during the process of electro-induced deformation memory in real time. Experimental results showed that appropriate amount of carbon nanotubes could not only improve the strength of composites but also provide electrical shape memory properties to composites. So, it is underscored that these kinds of shape memory composites exhibit excellent electro-responsive properties and have the potential to be used for intelligent and multiresponse shape memory applications.
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高影响因子
POLYMERS FOR ADVANCED TECHNOLOGIES
·
2021
·Vol. 32
·期 5
·2240-2251
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IF 3.665
Xin Li,Dong Liang,Zhiyong Hu,Jilai He,Xiangcheng Bian,Jianlan Cui
A polyoxometalate-based ionic liquid-doped sepiolite (SEP-PIL) was prepared by electrostatically immobilizing phosphomolybdic acid (PMA) on natural sepiolite embedded with imidazolium cations (SEP-IL), and its structural properties were fully characterized by various methods. Furthermore, a new intumescent flame-retardant system (IFR) for high-density polyethylene (HDPE) was constructed by adding SEP-PIL into conventional HDPE/IFR composites. The retardant properties and thermal decomposition behaviors were comprehensively investigated. The results showed that the HDPE composite containing 24 wt% IFR and 1 wt% SEP-PIL passed UL-94V-0 rating, and the limiting oxygen index increased from 17.8% (pure HDPE) to 27.6%. In addition, the HDPE/IFR/SEP-PIL composite had lower peak heat release rate (PHRR) and total heat release (THR) compared to the HDPE/IFR composite. The thermogravimetric analysis demonstrated that the combination of SEP-PIL with IFR could greatly promote the formation of residual chars. Dynamic rheological measurement further confirmed that the synergistic effect of SEP-PIL and IFR could greatly improve the flame retardancy of HDPE/IFR/SEP-PIL composites.
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高影响因子
POLYMERS FOR ADVANCED TECHNOLOGIES
·
2021
·Vol. 32
·期 9
·3804-3816
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IF 3.665
Yishen Chen,Jiaxin Li,Xuejun Lai,Hongqiang Li,Xingrong Zeng
High-efficiency macromolecular intumescent flame retardant (MIFR) is urgently demanded but of great challenge. In this work, a novel N -alkoxyamine-containing MIFR-decorated zirconium phosphate (ZrP) nanosheet (denoted as RQMIFR-ZrP) was synthesized and combined with ammonium polyphosphate (APP) to endowed polypropylene (PP) with excellent flame retardancy. With the addition of 6.3 wt% RQMIFR-ZrP and 18.7 wt% APP, PP classed a UL-94 V-0 rating with a high LOI value of 39.5%. Moreover, the peak heat release rate, the total heat release, the peak of CO production, and the peak of CO 2 production of PP/RQMIFR-ZrP/APP decreased by 94.0%, 83.2%, 91.3%, and 91.7%, respectively. It revealed that RQMIFR-ZrP not only generated nitroxyl radicals (NO•) to suppress the chain degradation of PP but also promoted to form high-quality intumescent char layers with the catalytic carbonization and layered barrier effect of ZrP nanosheet, which effectively prevented PP from burning. This work provides a new approach to preparing high-performance flame-retardant polymer.
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高影响因子
POLYMERS FOR ADVANCED TECHNOLOGIES
·
2021
·Vol. 32
·期 8
·2829-2842
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IF 3.665
Xilei Chen,Xihong Chen,Shaoxiang Li,Chuanmei Jiao
In this article, copper metal-organic framework (MOF-Cu) was synthesized and used as synergism with ammonium polyphosphate (APP) to prepare flame-retardant thermoplastic polyurethane (TPU) composites. The synergistic flame-retardant effects between MOF-Cu and APP in TPU composites were studied by cone calorimeter (CCT), limiting oxygen index tests (LOI), vertical burning tests (UL-94), smoke density test, etc. The results showed that MOF-Cu had some flame-retardant effects on TPU, and APP had good flame retardancy in TPU/APP composites. And, the flame retardancy of TPU/APP was further enhanced when MOF-Cu was used as synergism with APP. It has been found that the peak heat release rate (pHRR) and total heat release (THR) values of TPU/Cu 0.0625 sample were reduced by 26.0% and 1.3% compared with pure TPU, respectively. And the pHRR and THR values of TPU/APP sample were reduced by 70.3% and 15.8% compared with pure TPU. In the case of TPU/APP/Cu 0.0625 sample, the pHRR and THR values were furtherly reduced by 19.2% and 63.4% compared with TPU/APP, because of the minor amount of MOF-Cu. It has been found MOF-Cu cannot suppress the smoke release and reduce the total smoke release (TSR) value. However, 0.125 wt% MOF-Cu can make the TSR value of TPU/APP/Cu 0.125 sample reduce to 227.8 m 2 /m 2 , which was 23.4% lower than that of TPU/APP. The good synergistic flame-retardant effect between MOF-Cu and APP was obtained by the catalyzing carbonization process to form the char residue layer with high graphitization and expansion degree.
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高影响因子
POLYMERS FOR ADVANCED TECHNOLOGIES
·
2021
·Vol. 32
·期 8
·3232-3241
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IF 3.665
Wei Liu,Rui Shi,Zejiang Zhang,Mingqiang Yan,Xiaosui Chen,Yuyan Chen
Phytic acid (IP 6 ) as the major phosphorus-containing component of certain plants, such as cereal, oil plant, and bean possesses strong capability of coordinating with metal ion to form complex salt. In this study, low concentration IP 6 was utilized in combination with Al 3+ ion to in situ form insoluble Al 3+ -IP 6 complex salt on the surface of the fabric through coordination driven layer-by-layer deposition technology without high temperature cure step, which is an attempt to provide a facile bio-based flame retardant finishing to polyamide (PA) 66 fabric. Surface structure of the treated PA fabric has been analyzed via ATR-FTIR and SEM characterization. Effect of BLs' number on the flame retardancy and burning behavior of the treated sample has been examined by the limiting oxygen index (LOI) test, the vertical burning test, microcalorimetry, and thermogravimetric analysis. The results show that 20LBL PA fabric has the highest LOI value, highest residual char yield, and lowest THR value in all the samples and no melt dripping behavior could be detected during combustion of 20LBL PA fabric. Moreover, the insolubility of Al 3+ -IP 6 salt from the surface could promote the durability of the treated fabric after laundering procedure using water single. This is the first time to use coordination driven layer-by-layer deposition technology in the fabric's flame retardant finishing.
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高影响因子
危险品化学品经营许可证（带存储）