用在 5 0L固相接枝反应器中合成的马来酸酐接枝聚丙烯 (PP g MAH )作界面改性剂 ,制备了马来酸酐接枝聚丙烯 /聚丙烯 /碳酸钙 (i PP/PP g MAH/CaCO3 )复合材料。研究了i PP/PP g MAH/CaCO3 复合材料的力学性能和增容机理。结果表明 ,PP ...用在 5 0L固相接枝反应器中合成的马来酸酐接枝聚丙烯 (PP g MAH )作界面改性剂 ,制备了马来酸酐接枝聚丙烯 /聚丙烯 /碳酸钙 (i PP/PP g MAH/CaCO3 )复合材料。研究了i PP/PP g MAH/CaCO3 复合材料的力学性能和增容机理。结果表明 ,PP g MAH对i PP/CaCO3 复合物的缺口冲击强度、弯曲强度和拉伸强度均有提高 ;PP g MAH与CaCO3 反应形成PP g MAH的钙盐 ,实现反应性增容。展开更多
Calcium carbonate,which is widely employed as a filler added into the polymer matrix,has large numbers of applications owing to the excellent properties such as low cost,non-toxicity,high natural reserves and biocompa...Calcium carbonate,which is widely employed as a filler added into the polymer matrix,has large numbers of applications owing to the excellent properties such as low cost,non-toxicity,high natural reserves and biocompatibility.Nevertheless,in order to obtain the good filling effect,calcium carbonate needs to be surface modified by organic molecules so as to enhance the dispersion and compatibility within the composites.This review paper systematically introduces the theory,methods,and applications progress of calcium carbonate with surface modification.Additionally,the key factors that affect the properties of the composites as well as the current difficulties and challenges are highlighted.The current research progress and potential application prospects of calcium carbonate in the fields of plastics,rubber,paper,medicine and environmental protection are discussed as well.Generally,this review can provide valuable reference for the modification and comprehensive utilization of calcium carbonate.展开更多
In this work, novel CaCO3/Ag2CO3/AgI/Ag plasmonic photocatalysts were successfully synthesized by a two-step in situ ion exchange process and their photocatalytic properties were studied. The morphology, crystal struc...In this work, novel CaCO3/Ag2CO3/AgI/Ag plasmonic photocatalysts were successfully synthesized by a two-step in situ ion exchange process and their photocatalytic properties were studied. The morphology, crystal structure and optical properties of the as-prepared CaCO3/Ag2CO3/AgI/Ag nanocomposites were characterized by transmission electron microscopy （TEM）, X- Ray diffraction （XRD）, and UV-vis diffuse reflectance spectroscopy. The photocatalytic activity of the obtained nanocomposites was evaluated by the photodegradation of methyl orange （MO） under visible light irradiation. It was found that the as-prepared CaCO3/Ag2CO3/AgI/Ag plasmonic photocatalyst exhibits high visible light photocatalytic activity. With an optimized composition, MO dye can be decomposed by more than 94% within 15 min under visible light irradiation. Moreover, the photocatalytic stability could be greatly improved upon the addition of Na2CO3 into the photocatalytic system. From the proposed photocatalytic mechanism, the strong surface plasmon resonance effect of Ag nanoparticles and the efficient separation of photogenerated electrons and holes can effectively enhance the photocatalytic performance of the CaCO3/Ag2COj AgI/Ag composites.展开更多
文摘用在 5 0L固相接枝反应器中合成的马来酸酐接枝聚丙烯 (PP g MAH )作界面改性剂 ,制备了马来酸酐接枝聚丙烯 /聚丙烯 /碳酸钙 (i PP/PP g MAH/CaCO3 )复合材料。研究了i PP/PP g MAH/CaCO3 复合材料的力学性能和增容机理。结果表明 ,PP g MAH对i PP/CaCO3 复合物的缺口冲击强度、弯曲强度和拉伸强度均有提高 ;PP g MAH与CaCO3 反应形成PP g MAH的钙盐 ,实现反应性增容。
基金Project(AA18242008)supported by the Guangxi Science&Technology Major Project,ChinaProject(HZXYKFKT201904)supported by the Opening Project of Guangxi Key Laboratory of Calcium Carbonate Resources Comprehensive Utilization,China。
文摘Calcium carbonate,which is widely employed as a filler added into the polymer matrix,has large numbers of applications owing to the excellent properties such as low cost,non-toxicity,high natural reserves and biocompatibility.Nevertheless,in order to obtain the good filling effect,calcium carbonate needs to be surface modified by organic molecules so as to enhance the dispersion and compatibility within the composites.This review paper systematically introduces the theory,methods,and applications progress of calcium carbonate with surface modification.Additionally,the key factors that affect the properties of the composites as well as the current difficulties and challenges are highlighted.The current research progress and potential application prospects of calcium carbonate in the fields of plastics,rubber,paper,medicine and environmental protection are discussed as well.Generally,this review can provide valuable reference for the modification and comprehensive utilization of calcium carbonate.
基金supported by the National Natural Science Foundation of China(Grant No.21275136)the Natural Science Foundation of Jilin Province,China(Grant No.201215090)
文摘In this work, novel CaCO3/Ag2CO3/AgI/Ag plasmonic photocatalysts were successfully synthesized by a two-step in situ ion exchange process and their photocatalytic properties were studied. The morphology, crystal structure and optical properties of the as-prepared CaCO3/Ag2CO3/AgI/Ag nanocomposites were characterized by transmission electron microscopy （TEM）, X- Ray diffraction （XRD）, and UV-vis diffuse reflectance spectroscopy. The photocatalytic activity of the obtained nanocomposites was evaluated by the photodegradation of methyl orange （MO） under visible light irradiation. It was found that the as-prepared CaCO3/Ag2CO3/AgI/Ag plasmonic photocatalyst exhibits high visible light photocatalytic activity. With an optimized composition, MO dye can be decomposed by more than 94% within 15 min under visible light irradiation. Moreover, the photocatalytic stability could be greatly improved upon the addition of Na2CO3 into the photocatalytic system. From the proposed photocatalytic mechanism, the strong surface plasmon resonance effect of Ag nanoparticles and the efficient separation of photogenerated electrons and holes can effectively enhance the photocatalytic performance of the CaCO3/Ag2COj AgI/Ag composites.
