Institutional Repository of GuangZhou Institute of Energy Conversion, CAS
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Dispersion and Lubrication of Zinc Stearate in Polypropylene/Sodium 4-[(4-chlorobenzoyl) amino] Benzoate Nucleating Agent Composite
No full textZinc stearate (Znst) was physically blended with the sodium 4-[(4 chlorobenzoyl) amino] benzoate (SCAB) to obtain the SCAB-Znst composite nucleating agent. Znst was used to improve the dispersion property of SCAB and exert a lubricating effect on the PP matrix. The scanning electron microscopy and the fracture surface morphology of the PP/SCAB composite illustrated that the addition of Znst greatly reduced the aggregation phenomenon of SCAB in the PP matrix. The result of the rotary rheometer indicated that Znst exhibits internal lubrication in PP. The DSC result illustrated that the crystallization properties of PP were improved. Compared with pure PP, the Tc of the PP/SCAB composite increased by 1.44 degrees C (PP/Znst), 13.48 degrees C (PP/SCAB), and 14.96 degrees C (PP/SCAB-Znst), respectively. The flexural strength of pure PP, PP/SCAB, and PP/SCAB-Znst were 35.8 MPa, 38.8 MPa, and 40.6 MPa, respectively. The tensile strength of the PP/SCAB and PP/SCAB-Znst reached the values of 39.8 MPa and 42.9 MPa, respectively, compared with pure PP (34.1 MPa). The results demonstrated that Znst can promote the dispersion of SCAB in the PP matrix while exerting a lubricating effect, which enabled the enhancement of the crystalline and mechanical properties of PP
How far need to go from peak to neutrality? Perspective from energy consumption emission offset analysis in Beijing-Tianjin-Hebei Agglomeration
No full textCarbon emissions elimination in the rapid urbanization areas contributes to regional sustainable development and global climate change mitigation. With the target of carbon neutrality, the global top-class Beijing-TianjinHebei Urban Agglomeration which confronts with the dual pressure of excess carbon emissions and shrink ecological space has increased its carbon reduction coordination cooperation, among which energy consumption carbon emission control and natural resource sink maintenance have been recognized as the key strategy. However, the study on carbon balance prediction is lack and the amount of energy consumption carbon emissions in the future can be offset by the ecological carbon sink is still unknown. To estimate the gap to carbon neutrality, this study proposes a framework for carbon offset analysis and prediction which takes various carbon emission scenarios and the potential of natural resource on carbon reduction into consideration. After the framework conduction in the agglomeration, it is revealed that the regional least carbon emissions of 29.51 Mt mainly derive from the population and economic growth brought by urbanization process, while the carbon sink predicted to be 2552.31 Kt is still far to cover the emissions. With the regional carbon offset rate decline from 0.68% to 0.63%, the ecological carbon sink in Beijing will offset 1.21% of its carbon emission, while the least ecological space keep city Tianjin is predicted to suffer the lowest offset rate of 0.09%. The research results contribute to recognize the key factors on carbon emission control and key areas for carbon maintenance in following years, as well as narrowing the gap to neutrality with both consideration of carbon emission reduction and sink maintenance
Study on efficient extraction of saponins from Polygonatum sibiricum by enzyme assisted cold isostatic pressing technology
No full textSaponin is one of the main active ingredients of Polygonatum sibiricum. In this study, the method of enzymeassisted cold isostatic pressure extraction (EACIP) of Polygonatum sibiricum saponins was established. The effects of different cold isostatic extraction pressures, pressure-maintaining time times, enzymatic temperatures and enzymatic pH on the yield of saponin were investigated, and the factors were simplified by single factor experiments and Box-benhken design (BBD). Under the best extraction conditions, the EACIP method achieved the best possible results and extraction rate was 11.45 % +/- 0.017. In addition, SEM-Mapping, XRD analysis and FTIR analysis proved that EACIP treatment increased the extent of cell deformation and improved the mass transfer system between solvent and active substance. Furthermore, by comparing different extraction methods, EACIP was found to have a higher extraction rate due to the synergistic effect of cold isostatic pressure extraction (CIP) and enzymatic hydrolysis extraction (EH). In vitro antioxidant and anti-inflammatory assays demonstrated that EACIP extracts have good antioxidant and anti-inflammatory capacity. Therefore, EACIP is a method to extract natural products from plants with increased extraction rate
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