A kind of PEG-MAH（maleic anhydride to modify polyethylene glycol） crystalline polymer whose melting point was approximately 64 ℃ was synthesized, and its thickening traits to LPMC were also investigated. The analys...A kind of PEG-MAH（maleic anhydride to modify polyethylene glycol） crystalline polymer whose melting point was approximately 64 ℃ was synthesized, and its thickening traits to LPMC were also investigated. The analysis of rheological properties indicates that the dosage and adding methods of crystalline polymer have a direct effect on the viscosity of LPMC, and that the thickening method of using melting dispersal and freezing is propitious to the thickening process of SMC. Additionally, it is also shown that SMC＇ s viscosity decreases along with the elevation of temperature, and that it reduces rapidly at the medium range of temperature, which is propitious to the dispersal of SMC in mould, and to its low pressure molding as well.展开更多
Identifying melts of thickened lower continental crust from high Sr/Y rocks is very important to trace deep crustal processes. Recent studies on Dabie Early Cretaceous granitoids have revealed that melts derived from ...Identifying melts of thickened lower continental crust from high Sr/Y rocks is very important to trace deep crustal processes. Recent studies on Dabie Early Cretaceous granitoids have revealed that melts derived from thickened lower continental crust have higher Sr/Ca O ratios and define a high Sr evolution trend compared with normal granitoids. Fractional crystallization of plagioclase can significantly change Sr and Ca O contents of melts, but its role in controlling the Sr/Ca O ratios of the melts is still unclear. This study gives a direct comparison of plagioclase compositions between normal granitoids and low-Mg adakitic rocks. On the basis of Sr–Ca exchange partition coefficient, discussions on effect of plagioclase crystallization on Sr/Ca O ratios of melts show that fractional crystallization of abundant plagioclase cannot significantly change Sr/Ca O ratios of granitic melts, which are inherited from their individual initial melts. High Sr/Ca O ratios indicate the absence of plagioclase in sources of granitic melts. Therefore, high Sr/Ca O correlation can be an important indicator to identify melts derived from thickened lower continental crust.展开更多
基金Funded by the National Natural Science Foundation of China(No.50473013)
文摘A kind of PEG-MAH（maleic anhydride to modify polyethylene glycol） crystalline polymer whose melting point was approximately 64 ℃ was synthesized, and its thickening traits to LPMC were also investigated. The analysis of rheological properties indicates that the dosage and adding methods of crystalline polymer have a direct effect on the viscosity of LPMC, and that the thickening method of using melting dispersal and freezing is propitious to the thickening process of SMC. Additionally, it is also shown that SMC＇ s viscosity decreases along with the elevation of temperature, and that it reduces rapidly at the medium range of temperature, which is propitious to the dispersal of SMC in mould, and to its low pressure molding as well.
基金supported by theFundamental Research Funds for the Central Universities(2-9-2012-129)
文摘Identifying melts of thickened lower continental crust from high Sr/Y rocks is very important to trace deep crustal processes. Recent studies on Dabie Early Cretaceous granitoids have revealed that melts derived from thickened lower continental crust have higher Sr/Ca O ratios and define a high Sr evolution trend compared with normal granitoids. Fractional crystallization of plagioclase can significantly change Sr and Ca O contents of melts, but its role in controlling the Sr/Ca O ratios of the melts is still unclear. This study gives a direct comparison of plagioclase compositions between normal granitoids and low-Mg adakitic rocks. On the basis of Sr–Ca exchange partition coefficient, discussions on effect of plagioclase crystallization on Sr/Ca O ratios of melts show that fractional crystallization of abundant plagioclase cannot significantly change Sr/Ca O ratios of granitic melts, which are inherited from their individual initial melts. High Sr/Ca O ratios indicate the absence of plagioclase in sources of granitic melts. Therefore, high Sr/Ca O correlation can be an important indicator to identify melts derived from thickened lower continental crust.
