RSC Advances
·
2025
·Vol. 15
·期 15
·11835-11844
·
IF 4.6
Yanru Chen,Ke Yang,Hanhai Dong,Hongyu Niu,Quanguo Wang,Qingli Cheng
Silicone polyurea typically exhibits inferior mechanical properties due to the microphase separation between the siloxane and polyurea segments. To address this issue, we propose a method to enhance the mechanical properties through interfacial reactions. The mechanical properties and microphase separation of silicone polyurea we synthesized were studied. And poly(isobutene-alt-maleic anhydride) (PBAM) and γ-aminopropyl triethoxysilane (KH550) which are capable of interfacial reactions were respectively introduced into polyurea and siloxane segments to reduce the degree of microphase separation and enhance the mechanical properties of silicone polyurea. The mechanism behind the improvement was elucidated through experimental results. FT-IR spectra confirmed that the maleic anhydride groups in PBAM and the amino groups in KH550 undergo rapid reactions. Additionally, it was observed that the rapid interaction of PBAM and KH550 at the interface made interfacial tension decrease fast through the pendant-drop method. Stability analysis and light microscope observations revealed that PBAM and KH550 can stabilize the two-phase interface, forming stable droplets within the mixture. Scanning electron microscopy (SEM) observations indicated a reduction in the degree of microphase separation in the silicone polyurea. Consequently, the introduction of PBAM and KH550 decreases interfacial tension and the dispersion size of the silicone phase within the carbon phase, thereby reducing the degree of microphase separation and enhancing the mechanical properties of the silicone polyurea.
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
PROGRESS IN ORGANIC COATINGS
·
2024
·
IF 6.5
Li-Ping Zhang,Zhen-Guo Zhao,Yuan-Yuan Huang,Xing Cao,Xin-Yu Tian,Yan-Peng Ni,Yu-Zhong Wang
The cationic waterborne polyurethanes (CWPU) exhibit excellent affinity towards various materials possessing negative surface charges owing to its positive charge. However, its limited heat resistance and flame retardancy greatly restrict its practical application. In this work, we synthesized a flame retardant , 2-(6-oxido-6H-dibenz〈c,e〉〈1,2〉oxaphosphorin-6-yl)-1,4-hydroxyethoxyphenylene (DOPO-HQ-HE), and incorporated it into the skeleton of cationic waterborne polyurethanes to prepare flame-retardant cationic waterborne polyurethanes (CWPU-DHHxs). The obtained CWPU-DHHxs showed excellent flame retardancy, in which the LOI value of CWPU-DHH 12 reached over 26.9 vol% and passed UL-94 V-0 rating. The findings showed that CWPU-DHHxs exhibited remarkable efficacy in both the vapor and condensed phase during combustion. Moreover, the incorporation of DOPO-HQ-HE led to a significant improvement in heat resistance performance by facilitating enhanced microphase separation . Meanwhile, the major comprehensive performance of CWPU-DHHxs, including emulsion storage stability, thermal stability, mechanical performance, and transparency were effectively preserved.
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
FUEL
·
2024
·
IF 6.7
Xiuzhu Zhang,Zongxue Yu,Junlei Tang,Jiaqiang Huang,Xunwang Tang,Bing Lin,Shuangshuang Xia
The improvement of ionic conductivity and alkali stability of anion exchange membranes(AEMs) has been the focus of research. The abundant functional groups on the surface of inorganic nanomaterials tend to form a rich hydrogen bonding network, which reduces the activation energy and improves the ionic conductivity. In this paper, the prepared HF-Ti 3 C 2 T x was used as a filler in a quaternized poly(aryl piperidinium) (QPAP) matrix to enhance the performance of the membrane electrode assembly of an anion exchange membrane water electrolyzers (AEMWE). With the addition of MXenes, the mechanical properties of the composite membrane improved significantly (from 12.13 MPa to 27.85 MPa). At 80 °C, the ionic conductivity of QPAP-HM-0.7 was as high as 159.4 mS cm −1 . The results showed that the functional groups on the surface of MXenes and the polymer matrix successfully constructed a hydrogen bonding network within the membrane, forming a hydrophilic and hydrophobic microphase separation structure. In addition, the composite membranes prepared by doping HF-Ti 3 C 2 T x obtained good alkali stability (conductivity retention of more than 85 % after 720 h immersion at 80 °C in 1 M NaOH) and dimensional stability, which proved that MXenes is an effective filler to improve the membrane properties.
研究领域:
材料科学
·
电化学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF APPLIED POLYMER SCIENCE
·
2018
·Vol. 135
·期 17
·46069
·
IF 1.901
Xie Li,Wei Li,Xiaolin Wang,Heling Guo,Rongjie Wang,Xuhong Guo,Cuihua Li,Xin Jia
Waterborne polyurethane elastomer (WPU) has been widely used as a glue, but it still has some drawbacks, including a long cure time and weak adhesive force. In order to overcome these drawbacks, a new composite [PU/ferric ion complexation (Fe/PU)] with high adhesive strength was successfully prepared using ferric ion (Fe 3+ ) as a complexing agent. Fourier transform infrared spectroscopy, differential scanning calorimetry, dynamic mechanical analysis, and tensile testing were used to characterize the chemical structure and mechanical properties of the as-obtained composites. Introduction of the ferric ion induces a certain degree of microphase separation, resulting in better mechanical strength and interfacial adhesion. The mechanical properties of the PU composite with ferric ions are higher than that of pure PU. The adhesive strength of the 25%-Fe/PU composite is 32.46 ± 3.1 MPa, exhibiting superior adhesive strength. The tensile strength was enhanced 34%, and the elongation was enhanced 23.6% compared to pure PU. Furthermore, the Fe/PU composite, coordinated with ferric ions, exhibits an enhanced storage modulus and reduced loss coefficient compared to PU. We can foresee that Fe/PU composites will play an important role in the building and engineering areas. © 2018 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2018 , 135 , 46069.
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
Materials Express
·
2016
·Vol. 6
·期 4
·371-376
·
IF 1.606
Chen Yu,Wang Yaxin,Ye Yanchun,Ma Lifang,Liu Yang
A novel electronic packaging material made of polyurethane-organic silicone copolymer was prepared by using hydroxyl terminated polybutadiene (HTPB) and α,ω-dihydroxy polydimethylsiloxane (PDMS) as soft segments, and isophorone diisocyanate (IPDI) as hard segments.
The correlation between the structure and properties of the electronic packaging material was studied with a series of samples prepared by different mass ratios of HTPB and PDMS. Several techniques, including FTIR, DSC, XRD, TG, and mechanical testing, were employed to characterize the structure
and properties, including micro-phase separation, thermal stability, and mechanical property of the products. It was found that the micro-phase separation between the soft segments and the hard segments was related to the mechanical properties, adhesive properties, and the thermal stability
of the copolymer. The preparation conditions were further investigated to obtain electronic packaging materials with ideal properties. The electronic packaging adhesive with optimum properties was achieved under the preparation condition of PDMS mass content of 5%–7%.
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
Applied Materials Today
·
2021
·
IF 10.041
Juan Liu,Zhigang Chen,Chengshen Hu,Wei Yang,Jinfeng Wang,Weilong Xu,Yuanliang Wang,Changshun Ruan,Yanfeng Luo
Shape memory polyurethanes (SMPUs) with excellent shape memory effects (SMEs) can be served as a kind of smart materials capable of responding to external stimuli. Microphase separation behavior between soft and hard segments of SMPUs is recognized as structural basis and an intrinsic factor for SMEs of SMPUs. Therefore, effective detection of microphase separation behavior is highly desired in order to clarify the mechanism of SMEs and further regulate the SMEs of SMPUs. Although great progresses have been made in detection of microphase separation behavior of SMPUs, non-destruction and real-time visualization for tracking the microphase separation behavior during the shape memory process of SMPUs remains a great challenge. Herein, a facile fluorescence visualization method is presented to directly, fast and nondestructively monitor the microphase separation behavior of SMPUs. Specifically, a series of novel inherent fluorescent SMPUs (IFPUs) with different hard segment contents (10%, 15% and 20%) were first prepared by using a fluorescent small molecule as part of their hard segments. It was found that this fluorescent molecule could visualize the aggregation of hard segments and the corresponding microphase separation behavior in a real-time manner. Moreover, by conducting a semi-quantitative calculation of the collected fluorescent images, the size, aspect ratio and orientation of the hard segment domains could be obtained. The results indicated that increasing the contents of hard segments could enhance the microphase separation and both stretching (50%, 100% and 200%) and subsequent recovering processes could promote the formation of larger and longer hard segment domains tending to take a perpendicular orientation to stretching.
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
POLYMER
·
2024
·
IF 4.1
Tiancheng Dai,Chao Yi,Shuohong Dong,Mingjie Zhang,Chao Long,Zhen Li,Wenkai Liu,Feng Luo,Jiehua Li,Hong Tan
This study incorporated polydimethylsiloxane (PDMS) and a kind of siloxane-based chain extender (SDO) into polyether urethanes (PEU). The correlation between microphase separation structure and mechanical properties, surface properties and wear resistance were investigated using multiple characterization techniques such as DSC , DMA , SAXS, ATR-FTIR, and XPS . The addition of PDMS significantly reduced the friction coefficient of PEU and enhances the hydrophobicity . The addition of SDO helped to improve the compatibility between PDMS and hard segments of PEU as proved by the fact that the glass transition temperatures of PDMS segments were shifted to higher temperatures and the fraction of loosely hydrogen-bonded carbonyls increased. Due to the improved interfacial adhesion between the immiscible segments, the wear resistance of PEU modified by both PDMS and SDO was obviously enhanced.
研究领域:
材料科学
·
表面化学
✓ 已验证
产品关联
DOI
高影响因子
Materials Today Communications
·
2025
·
IF 4.5
Qingyun Lu,Qianqian Fan,Fengfeng Zhang,Jiahui Li,Qi Cao,Xigao Jian,Zhihuan Weng
Toughening epoxy resins with modifiers without compromising their modulus and mechanical strength poses a significant challenge. In this work, a bio-based N-heterocyclic-containing reactive toughening agent, HPESZ, was synthesized based on cinnamon derivatives and succinic anhydride. And then the HPESZ was incorporated into the bisphenol A epoxy resin/4, 4′-diaminodiphenylmethane (E44/DDM) curing system to evaluate its effect on the toughening of epoxy resins. The results suggested that the impact strength of the E44/5 %HPESZ/DDM blended system achieved a peak value of 72.4 kJ m −2 , representing a 90.0 % increase over the E44/DDM system (38.1 kJ m −2 ). Subsequently, the toughened system was characterized using scanning electron microscopy and atomic force microscopy to explain its phase structure and toughening mechanism. The cured system produced the chemically induced microphase separation, and the presence of epoxide groups and terminated hydroxyl groups enhanced the interfacial compatibility of E44/DDM, thereby increasing the impact strength. Moreover, the flexural strength, flexural modulus, hardness, and Young's modulus of the blended system were also improved simultaneously. In conclusion, HPESZ is a reactive bio-based toughening agent with promising practical applications.
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
MACROMOLECULAR RAPID COMMUNICATIONS
·
2024
·
IF 4.2
Huimin Duan,Shuli Li,Jinbiao Zhao,Hao Yang,Heyang Tang,Dongming Qi,Zhichao Huang,Xinxin Xu,Lei Shi,Peter Müller-Buschbaum,Qi Zhong
Due to the advantages of low energy consumption, no air and water pollutions, the reactive polyurethane films (RPUFs) are replacing the solvated and waterborne PUFs nowadays, which significantly promotes the green and low-carbon production of PU films. However, the microstructure evolution and in situ film-formation mechanism of RPUFs in solvent-free media are still unclear. Herein, according to time-temperature equivalence principle, the in situ polyaddition and film-formation processes of RPUFs generated by the typical polyaddition of diisocyanate terminated prepolymer (component B) and polyether glycol (component A) are thoroughly investigated at 25 °C. According to the temporal change of viscosity, the RPUFs gradually transfer from liquid to gel and finally to solid state. Further characterizing the molecular weight, hydrogen bonds, crystallinity, gel content, and phase images, the polyaddition and film-formation processes can be divided into three stages as 1) chain extension and microcrystallization; 2) gelation and demicrocrystallization; 3) microphase separation and film-formation. This work promotes the understanding of the microstructure evolution and film-formation mechanism of RPUFs, which can be used as the theoretical guidance for the controllable preparation of high-performance products based on RPUFs.
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
CARBOHYDRATE POLYMERS
·
2024
·
IF 10.7
Huanjuan Sun,Xuehui Wang,Zhigang Wang
Sustainable cellulose- graft -diblock copolymers (cellulose- graft -polyisoprene- block -polylactide, MCC- g -PI- b -PLLA, MCC was chemically-modified microcrystalline cellulose) were designed and delicately synthesized for the first time by a mild and facile procedure via combining ring-opening polymerization and reversible addition-fragmentation chain transfer polymerization techniques, which conquered the difficulties in synthesis due to the distinct chemical properties among the MCC backbone, PI and PLLA blocks. Two separate glass transition temperatures were detected for MCC- g -PI- b -PLLA copolymers by differential scanning calorimetry, indicative of microphase separation, consistent with small-angle X-ray scattering and atomic force microscopy measurements. The α -form crystals of PLLA outer blocks were revealed by wide-angle X-ray diffraction measurement. The monotonic and step-cyclic tensile tests revealed that the mechanical property could be tuned by changing the molecular mass of PI midblock. The two ends of the soft PI midblock were anchored by rigid cellulose backbone and hard PLLA outer block, respectively, which served as physical crosslinking points. The rigid cellulose backbones brought the PI rubbery domains and PLLA hard domains together to form a whole hierarchical microstructure, endowing the copolymers with distinguished mechanical property. This work provided a feasible approach to producing environmental-friendly cellulose-based copolymers with fully biomass-derived feedstocks, having a profound impact on the development of sustainable polymer-based materials.
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
MACROMOLECULAR MATERIALS AND ENGINEERING
·
2025
·
IF 4.6
Mingping Zhou,Jiaqiang Xiong,Dingzhe Che,Qiang Wu,Shichao Zhang,Denghui Wang,Fei Gao,Zheng Zhang,Jiping Yang
In protective applications, polyurethane (PU) is a key material, yet the microstructural mechanisms governing its dynamic mechanical properties are not well understood. This study investigates the influence of hard segment content on the low strain rate compression and high strain rate impact properties of waterborne polyurethane (WPU) by modulating the NCO/OH ratio. Mechanical responses are characterized using a universal testing machine and a split Hopkinson pressure bar (SHPB) system. Additionally, the hydrogen bonding and microphase separation structure are analyzed using FTIR, DSC, DMA, and SAXS. These findings reveal that the glass transition temperatures ( T g DSC and T g DMA ) shift toward higher temperatures with increasing hard segment content, which is attributed to the intensified hydrogen bonding cross-linked network, as corroborated by FTIR and SAXS analyses. The WPU demonstrates a pronounced strain rate sensitivity across a broad range of strain rates (10 −4 –10 4 s −1 ). Notably, the 45 wt.% hard segment WPU523 sample shows heightened sensitivity, attributed to complex hydrogen bonding heterogeneity and a higher Herman's orientation factor during loading, the key to WPU's dynamic mechanical response.
研究领域:
材料科学
·
力学
✓ 已验证
产品关联
DOI
高影响因子
ADVANCED FUNCTIONAL MATERIALS
·
2022
·Vol. 33
·期 10
·2208083
·
IF 19.924
Manwen Zhang,Ran Yu,Xinglin Tao,Yangyang He,Xinpan Li,Feng Tian,Xiangyu Chen,Wei Huang
Ionogels are promising materials for flexible electronics due to their continuous conductive phase, high thermal and chemical stability. However, a large amount of ionic liquid is required to get high conductivity, resulting in a sharp decline in the mechanical properties. Therefore, it is a great challenge to prepare ionogels with both high conductivity and mechanical properties, which is important for their practical applications. Herein, ionogels with high mechanical strength and stretchability, extraordinary ionic conductivity, excellent transparency, outstanding durability, and stability are fabricated with crosslinked polymer, ionic liquid, and lithium salt. The adoption of lithium salt can significantly improve both the mechanical strength and stretchability, which is a common dilemma in material science, and simultaneously, address the conflict between mechanical strength and ionic conductivity in ionogels. It is primarily corresponding to the microphase-separation effects induced by the lithium bonds formed between lithium ions and carbonyl groups on the polymer networks. Ionotronics including resistance-type sensors for strain and temperature sensing and triboelectric nanogenerators with stable output performance are fabricated. Moreover, ionogel-based microcircuit and sensing arrays with high resolution and accuracy are fabricated through digital light processing printing technology. The ionogels have great promise for various ionotronics in many fields.
研究领域:
材料科学
·
柔性电子学
·
传感器技术
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）