ACS Applied Polymer Materials
·
2025
·
IF 4.7
ZhangHe Wang,Chao Zeng,YuHao Wu,ChaoChen Xu,ShengMing Zhang,Peng Ji,ChaoSheng Wang,HuaPing Wang
Polyester (PET) has become the focus of research in the shrink film industry due to its good heat resistance, high transparency, and excellent mechanical properties. In order to improve the shrinkage rate of the film, amorphous PET (PETG) is usually obtained by copolymerization modification using some flexible diols and so on. However, introducing flexible structures reduces the glass transition temperature (Tg) and mechanical strength, and importantly, the gas barrier properties of most PETGs are weak. Here, a series of poly(terephthalic acid-naphthalene dicarboxylic acid-ethylene glycol-neopentyl glycol) (PENTN) were prepared by melt polymerization using different contents of 1,4-naphthalene dicarboxylic acid (1,4-NDA) or 2,6-naphthalene dicarboxylic acid (2,6-NDA). The results show that the introduction of 1,4-NDA does not enhance the Tg of the copolyesters significantly, whereas the Tg of the copolyesters increases linearly with the increase in the content of 2,6-NDA. The Tg of 2,6-PENTNs ranges from 82.2 to 90.5 °C. The crystallization is inhibited effectively due to the neopentyl glycol and exhibits good transparency (>85%) and low haze value (<4%), which results in the preparation of copolyesters that are all amorphous polymers. The differences in the effects of 2,6-NDA and 1,4-NDA on the thermal properties of the copolyesters were analyzed. Meanwhile, the copolyesters were prepared into films, and the gas barrier properties were analyzed in detail. The rheological analysis reveals the free volume of the copolyester is rapidly decreasing with the introduction of the naphthalene group structure. The gas barrier property of the copolyesters can be improved to a high level. This work provides an idea for the functionalized modification of packaging materials.
研究领域:
材料科学
·
高分子化学
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产品关联
DOI
高影响因子
Journal of Thermal Science
·
2023
·Vol. 33
·期 1
·383-393
·
IF 2.5
Dai Zhaofeng,She Xiaohui,Shao Bohan,Yin Ershuai,Ding Yulong,Li Yongliang,Zhang Xiaosong,Zhao Dongliang
Plastic crystal neopentyl glycol (NPG) exhibits colossal barocaloric effect with high entropy changes. However, their application is restricted in several aspects, such as low thermal conductivity, substantial supercooling effect, and poor springback properties. In this work, multi-walled carbon nanotubes (MWCNTs) with ultra-high thermal conductivity and high mechanical strength were selected for performance enhancement of NPG. The optimal mixing ratio was determined to be NPG with 3 wt% MWCNTs composites, which showed a 6 K reduction in supercooling without affecting the phase change enthalpy. Subsequently, comprehensive performance of the composites with optimal mixing ratio was compared with pure NPG. At 40 MPa, 390 J·K −1 ·kg −1 change in entropy and 9.9 K change in temperature were observed. Furthermore, the minimum driving pressure required to achieve reversible barocaloric effect was reduced by 19.2%. In addition, the thermal conductivity of the composite was increased by approximately 28%, significantly reducing the heat exchange time during a barocaloric refrigeration cycle. More importantly, ultra-high pressure release rate resulted in a 73.7% reduction in the springback time of the composites, offering new opportunities for the recovery of expansion work.
研究领域:
材料科学
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热力学
·
能源工程
✓ 已验证
DOI
高影响因子
THERMOCHIMICA ACTA
·
2016
·
IF 1.938
Chao Wang,Qifeng Li,Liping Wang,Xiaozheng Lan
Size-dependent thermal properties of neopentyl glycol (NPG) embedded in controlled porous glasses (CPGs) are investigated using differential scanning calorimetry (DSC), infrared spectroscopy (FT-IR), and powder X-ray diffraction (XRD). In the nanopores of CPGs (diameter d = 11.5–300 nm), NPG shows depressed solid–solid and solid–liquid phase transition temperatures and latent heats, which decrease as the pore size becomes smaller. In thermal cycling around the solid transition, the nano-sized NPG display stable transition temperature and enthalpy change as the bulk. Supercooling in the solid transition increases with the decreasing pore diameter ( d > 25 nm). From FT-IR and XRD analysis, NPG in the nanopores maintains the same structure as the bulk. The nanoencapsulated NPG is analogous to a series of new phase change materials (PCMs), through which the ideal heat storage performance of the bulk may be handed down.
研究领域:
材料科学
·
热力学
·
化学工程
✓ 已验证
产品关联
DOI
高影响因子
Journal of Energy Storage
·
2025
·
IF 9.8
Jian Lv,Zhuyu Wang,Yihuan Zhou,Weihao Yu,Qinggong Jia
Due to long-term operation under high voltage, the cathode of lithium metal battery undergoes parasitic reactions with the electrolyte, resulting in non-conductive polymers that severely affect the battery's electrochemical performance and kinetics. In addition, the safety performance of the battery is seriously compromised by severe lithium deposition on the lithium metal side. The use of electrolyte additives is one of the most cost-effective strategies for improvement. A low-cost boron-based additive bis(pinacolato)diboron (BDB) has been proposed in this work which has relatively high activity during battery charging and discharging. A protective cathode electrolyte interface (CEI) film was formed by BDB on the surface of NCM811 in advance to resist HF and solvent erosion. Furthermore, the solid electrolyte interface (SEI) film that BDB participates in on the lithium metal surface exhibits high ion conductivity and effectively inhibits the formation of lithium dendrites, thereby ensuring the safe operation of lithium metal batteries. The lithium metal battery utilizing BDB not only exhibits optimal electrochemical performance with a high cut-off voltage of 4.6 V, but also demonstrates potential for further development in the realms of rapid charging and discharging.
研究领域:
材料科学
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电化学
·
能源存储技术
✓ 已验证
DOI
高影响因子
POLYMER
·
2025
·
IF 4.5
Wanjing Zhang,Liyan Wang,Yunsheng Chong,Wei Liu,Xin Qian
In this study, the copolyester plasticizers PHNAZ, synthesized from azelaic acid and hexanediol and modified by neopentyl glycol (NPG), was prepared via direct esterification. A series of characterization tests revealed that the number-average molecular weight of the PHNAZ copolyester plasticizers was less than 2000 with a dispersion coefficient of less than 2, demonstrating excellent thermal stability below 250 °C. PVC samples plasticized with PHNAZ showed thermal degradation temperatures above 250 °C, reduced glass transition temperatures to −33 °C, and significantly improved hydrophilicity. Notably, the water contact angle of PHNAZ-50/PVC was smallest, averaging 53.956°. The highlight of the study is the cytotoxicity testing of the prepared PHNAZ copolyester plasticizer at concentrations of 1 μg/mL, 10 μg/mL, and 50 μg/mL, where the average cell survival rate exceeded 100 %, indicating excellent biocompatibility. Additionally, PHNAZ displayed outstanding plasticizing effects, particularly PHNAZ-20/PVC, which achieved an elongation at break of 913.6 % and a plasticizing efficiency of 260.0 %. These results suggest that PHNAZ not only excels in chemical and thermal properties but also exhibits good biocompatibility and high plasticizing capability, indicating broad application prospects.
研究领域:
材料科学
·
生物学
✓ 已验证
产品关联
DOI
高影响因子
SAFETY SCIENCE
·
2020
·
IF 4.105
Ru Zhou,Jingjing Mu,Xiaoyan Sun,Yanming Ding,Juncheng Jiang
A novel intumescent flame retardant (IFR) composed of aluminum diethyphosphinate, neopentyl glycol, and melamine was incorporated into linear low-density polyethylene (LLDPE). The flame retardancy, thermal properties, and flame retardant mechanism of the materials were investigated. The chemical structures of composites were characterized by Fourier-transform infrared spectroscopy. Samples with thicknesses of 3 mm achieved the UL-94 V-0 rating during vertical burning tests, and the limiting oxygen index was 26.9% when 28 wt% IFR was introduced. The results of the thermogravimetric analysis showed that the addition of the IFR promoted the degradation and carbonization of the materials initially, increased the amount char residue, and improved the thermal stabilities of the composites at high temperatures. Cone calorimeter tests indicated that the peak value of the heat release rate was considerably reduced with the incorporation of the IFR. The digital photographs and scanning electron microscopy images of the char residue after cone calorimeter tests showed the formation of compact and thermally stable char layers on the polymer composites surfaces.
研究领域:
材料科学
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化学工程
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF CHEMICAL AND ENGINEERING DATA
·
2017
·
IF 2.323
Dong-Fang Zhao,Li-Sheng Wang,Jian Sun,Chuan-Ming Chen
A phosphorus flame retardant named N,N′-piperazinebis(neopentylglycol)phosphoramidate (PBNGP) was synthesized and characterized by elemental analysis, Fourier transform infrared spectroscopy, mass spectra, and nuclear magnetic resonance. Its thermal properties were evaluated via thermogravimetric analysis and differential scanning calorimetry. The solubilities of PBNGP in selected solvents at T = (293.15 to 333.15) K and atmospheric pressure were measured via a static-analytic method. The experimental data were correlated with Scatchard–Hildebrand, Buchowski-Ksiazczak, Wilson, nonrandom two liquid, and universal quasichemical equations. The calculated results showed that all of these models can reproduce the experimental data well, and the Wilson model gives the best correlation, with an overall relative standard deviation of 0.70%. The solubility parameter of PBNGP was calculated using the Scatchard–Hildebrand methodology.
研究领域:
化学
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF THE ELECTROCHEMICAL SOCIETY
·
2021
·Vol. 168
·期 9
·090554
·
IF 4.316
Donghai Huang,Zhiqiang Ge,Changfu Yuan,Ao Mei,Zhiyong Fu,Zhiping Le
Bis(neopentyl glycolato)diboron (BNGDB) is used as a electrolyte additive to improve the stability of commercialized lithium ion batteries operating at a high charging-cutoff voltage. Adding of BNGDB lowers the oxidation potential of the electrolyte, which will lead to the formation of a uniform, stable, and low resistance cathode solid electrolyte interphase (CEI) on the cathode surface. This CEI film can suppress the loss of electrolyte by preventing further reaction between electrolyte and cathode material (LiNi0.6Co0.2Mn0.2O2), which improves cyclic stability and discharge capability of LiNi0.6Co0.2Mn0.2O2/graphite pouch cells. With 0.5 wt% BNGDB addition, the pouch cell demonstrate a discharge capacity retention of 83.2% after 200 cycles in base electrolyte. This work brings new insight into the role of additives in electrolytes and can guide the design of more versatile electrolytes for commercialized lithium-ion batteries.
研究领域:
材料科学
·
电化学
✓ 已验证
DOI
高影响因子
LANGMUIR
·
2021
·
IF 3.882
Yixian Luo,Dou Jin,Wenjin He,Jianzhong Huang,Aicheng Chen,Feng Qi
The opal-like SiO2 microcarriers with different pore diameters named opal-SiO2I and opal-SiO2II were synthesized and utilized as microcarriers to immobilize Rhizopus oryzae lipase (ROL) and Aspergillus oryzae α-amylases (AOA). ROL and AOA can be more stably immobilized on the cross-linked SiO2 opals by neopentyl glycol diglycidyl ether (NGDE), which is the first attempt to use it as a cross-linking agent compared with glutaraldehyde. According to the morphology analysis, multiple layers of SiO2 monodisperse microspheres were regularly packed and formed an opal-like structure, and enzymes were well scattered and immobilized throughout the SiO2 opals. The results showed that the performance of enzymes immobilized on opal-SiO2II with a larger specific surface area was much better than that of opal-SiO2I. The enzyme activity of ROL@opal-SiO2II and AOA@opal-SiO2II cross-linked with 1% NGDE increased 5.32 and 9.32 times compared with their free counterpart, respectively. Furthermore, pH and thermal stability and reusability of ROL/AOA@opal-SiO2II were significantly improved and higher than those of ROL/AOA@opal-SiO2I and free enzymes. This study provides an easily obtained microcarrier opal-SiO2II, which shows potential for efficient different enzyme immobilizations and further industrial applications.
研究领域:
生物化学
·
材料科学
·
酶工程
✓ 已验证
DOI
PubMed
高影响因子
PROGRESS IN ORGANIC COATINGS
·
2025
·
IF 7.3
Mengtong Wang,Ying Miao,Rikun Liu,Liang Shen,Yingying Du,Changqing Fu
The use of bisphenol A (BPA) in traditional waterborne epoxy coating formulations is harmful to human health, and the low toughness of the cured film severely limits its application in many areas. Most BPA alternatives enhance the toughness of the epoxy cured film but compromise the coating's properties to varying degrees. Therefore, developing a BPA alternative that toughens epoxy resins without sacrificing modulus and mechanical strength remains a significant challenge. In this study, we synthesized dicarboxylic acid compound (PNP) with a structure similar to BPA, using phthalic anhydride and neopentyl glycol. This compound serves as a substitute for BPA. We systematically explored the influence of different PNP contents on the performance of waterborne epoxy resins and coatings. The results showed that PNP is more conducive to preparing waterborne epoxy resins with smaller particle sizes and stable heat storage. Compared with BPA-modified epoxy resin, PNP significantly increases the elongation at break and tensile strength of the cured film. Moreover, different PNP contents can significantly improve the coating's impact resistance, pull-off adhesion, water resistance, salt spray resistance, and acid resistance without affecting other mechanical properties and alkali resistance. This study provides a new perspective for preparing environmentally friendly, high-performance, tough, and stable waterborne epoxy coatings.
研究领域:
材料科学
·
高分子化学
·
涂层技术
·
环境科学
✓ 已验证
产品关联
DOI
高影响因子
THERMOCHIMICA ACTA
·
2017
·
IF 2.236
Wanqing Lei,Changqing Fang,Xing Zhou,Youliang Cheng,Rong Yang,Donghong Liu
Since polyurethane elastomer (PUE) is widely used in many fields, it is always the popular topic in the scientific research. In this paper 1,4 -butanediol ( 1,4- BDO), neopentyl glycol (NPG) and bisphenol -a (BPA) were chosen as chain extenders to prepare polyurethane elastomer (PUE) due to their representative structures. After the synthesis of PUE with these comparable chain extenders, morphology and thermal properties were evaluated by different characterization methods The results showed that, compared with NPG and BPA, 1,4- BDO has made PUE in synthesis of para -phenylene (PPDI) more easily crystallize in soft segments while PUE based on diphenylmethane diisocyanate (MDI) arrange orderly in hard segments, so that micro-phase separation appeared. Besides, PUE in synthesis of PPDI and 1,4- BDO showed the best thermal stability. Additionally, chain extenders increased the viscosity of samples, especially 1,4- BDO, which made PUE not only have a relatively higher viscosity, but also maintain a good process ability.
研究领域:
材料科学
·
高分子化学
·
热分析
✓ 已验证
产品关联
DOI
高影响因子
EUROPEAN POLYMER JOURNAL
·
2023
·
IF 6
Tao Yang,Fei Liu,Ruixue Gao,Jiaxi Li,Jinggang Wang,Jin Zhu
Development of bio-based thermoplastic poly(ether-ester) elastomer (TPEE) with high performance similar to commercial and petroleum-based TPEE is of great interesting nowadays. Herein, by considering both the hard and soft segments, a rational design strategy is proposed for the synthesis of bio-based TPEE with high elasticity based on a bio-based aromatic monomer 2,5-furandicarboxylic acid (FDCA). The hard segment is poly(neopentyl glycol 2,5-furandicarboxylate) (PNF), a FDCA-based polyester with both high melting temperature and crystallization ability. While the soft segment is poly(tetramethylene glycol) (PTMG), which is widely used for the synthesis of TPEE. By adjusting the molecular weight ( M n ) of PTMG soft segment from 650 to 2900 g/mol and its content from 50 to 70 wt%, a series of bio-based TPEEs with excellent performance were synthesized. Our preliminary study of PNF-PTMG multiblock copolymers has shown that the elastic recovery rate is outstanding. The initial elastic recovery ratio at 200 % strain can approach 80 % when the M n of PTMG is 2000 g/mol and the wt.% of PTMG was 70 %, which is significantly higher than those of the commercial TPEEs. PNF-PTMG displays increasing thermal resistance with T m up to 194 °C with the increasing of soft segment length. This study suggests a feasible solution for the preparation of bio-based TPEE with ideal performance.
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
危险品化学品经营许可证（带存储）