EUROPEAN POLYMER JOURNAL
·
2019
·
IF 3.621
Hongzhou Xie,Hongxu Meng,Linbo Wu,Bo-Geng Li,Philippe Dubois
Poly(ethylene 2,5-furandicarboxylate) (PEF) is an emerging biobased polyester well-known for high gas barrier properties as well as high tensile modulus and strength , but PEF modification is still desired to improve its crystallization rate, toughness and even strength. In this study, PEF/Montmorillonite (MMT) nanocomposites were in-situ synthesized via melt polycondensation of dimethyl furandicarboxylate and ethylene glycol in the presence of a commercially available organically modified montmorillonite (OMMT), i.e., DK2, a montmorillonite clay modified with octadecyl hydroxyethyl dimethyl ammonium. The structure of nanocomposites was characterized by ATR-FTIR, 1 H NMR, WAXD and TEM, and their thermal and mechanical properties were assessed with DSC, TGA and tensile test. The OMMT was grafted with PEF chains and therefore exfoliated, at least partially, in the PEF matrix with intrinsic viscosity over 0.7 dL/g. With respect to pristine PEF, the nanocomposites containing 2.5 wt% DK2 showed significantly improved melt crystallization, tensile modulus and strength.
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
CRYSTENGCOMM
·
2021
·Vol. 23
·期 33
·5655-5662
·
IF 3.545
Jianqi Yao,Xuzhao Li,Jing Lu,Qing Ma,Yongdong Liu,Faliang Luo
In this study, we synthesized a type of microcrystalline H-ZnOc with columnar structure by controlling the solubility of the reaction solution. Poly(ethylene 2,6-naphthalate) (PEN) and hexagonal zinc oxide column (H-ZnOc) composite materials were prepared by a twin screw extruder and the properties of the composites were characterized. The results showed that H-ZnOc has a remarkable nucleation effect on PEN, especially when the loading amount of H-ZnOc is 1.5 wt%; the nucleation efficiency is as high as 52.28%, and the crystallization temperature increased by nearly 23 °C. The crystal morphology changed, with the disappearance of the cold crystallization peak after the addition of H-ZnOc, the size of spherulites decreased and the number of spherulites increased. During the isothermal crystallization process, H-ZnOc significantly reduced the crystallization time of PEN. The impact strength of PEN increased from 1.86 kJ m−2 to 2.73 kJ m−2. Our results showed that H-ZnOc can be used as an effective nucleating agent for PEN, effectively improving the crystallization ability and mechanical properties, and its performance is comparable to the proprietary polymer nucleating agents NX8000, HPN68L, and TMB-5, etc.
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
Polymers
·
2016
·Vol. 8
·期 1
·10
·
IF 2.944
Bo Jin,Juan Shen,Xiaoshuang Gou,Rufang Peng,Shijin Chu,Haishan Dong
A series of energetic polymers, poly(vinyl 2,4,6-trinitrophenylacetal)-g-polyglycidylazides (PVTNP-g-GAPs), were synthesized via cross-linking reactions of PVTNP with three different molecular weight GAPs using toluene diisocyanate as the cross-linking agent. The structures of these energetic polymers were characterized by ultraviolet visible spectra (UV–Vis), attenuated total reflectance-Fourier transform-infrared spectroscopy (ATR-FTIR), and nuclear magnetic resonance spectrometry (NMR). The glass-transition temperatures of these energetic polymers were measured with differential scanning calorimetry (DSC) method, and the results showed that all the measured energetic polymers have two distinct glass-transition temperatures. The thermal decomposition behaviors of these energetic polymers were evaluated by differential thermal analysis (DTA), thermogravimetric analysis (TGA) and thermogravimetric analysis tandem infrared spectrum (TGA-IR). The results indicated that all the measured energetic polymers have excellent resistance to thermal decomposition up to 200 °C, and the initial thermal decomposition was attributed to the breakdown of azide group. Moreover, the sensitivity properties of these energetic polymers were measured with the national military standard methods and their compatibilities with the main energetic components of 2,4,6-trinitrotoluene (TNT)-based melt-cast explosive were evaluated by using the DTA method. The results indicate that these energetic polymers have feasible mechanical sensitivities and can be safely used with TNT, cyclotetramethylene tetranitramine (HMX), 1,1-diamino-2,2-dinitroethene (FOX-7), 3-nitro-1,2,4-triazol-5-one (NTO) and 1,3,5-triamino-2,4,6-trinitrobenzene (TATB).Keywords:energetic polymer;poly(vinyl 2,4,6-trinitrophenylacetal)-g-polyglycidylazides;thermal stability;sensitivity property;compatibility
研究领域:
材料科学
·
化学工程
✓ 已验证
DOI
PubMed
高影响因子
危险品化学品经营许可证（带存储）