The heat-setting of carpet yarns is a necessary process if you want to obtain a high quality woven or tufted carpet. Different setting processes exist, each with its respective advantages and drawbacks (hot air, overh...The heat-setting of carpet yarns is a necessary process if you want to obtain a high quality woven or tufted carpet. Different setting processes exist, each with its respective advantages and drawbacks (hot air, overheated steam, saturated steam under pressure).展开更多
Due to the mechanical stability of PP layer,the PP/HDPE double-layer microporous mem brane could be prepared at a higher heat-setting temperatu re than that of PE monolayer membrane.In this work,the effects of heat-se...Due to the mechanical stability of PP layer,the PP/HDPE double-layer microporous mem brane could be prepared at a higher heat-setting temperatu re than that of PE monolayer membrane.In this work,the effects of heat-setting temperature on the pore structure and properties of PP/HDPE dou ble-layer membrane were studied.With the increase of heat-setting temperature from 120℃to 130℃,the length of connecting bridge crystal and crystallinity in the PE layer increase due to the melting of thin lamellae and the stability of connecting bridge structure during heat-setting.The corresponding air permeability,po rosity,wetta bility of liquid electrolyte and mechanical property of the heat-set microporous membrane increase,exhibiting better electrochemical performance.However,when the heat-setting temperature is further increased to 140℃,higher than the melting point of PE resin,some pores are closed since the lamellae and connecting bridges melt and shrink during heat-setting,resulting in a decrease of air permeability and porosity.In contrast,there is negligible change in the PP layer within the above heat-setting temperature region.This study successfully builds the relationship between the stable pore structure and property of microporous membrane during heat-setting,which is helpful to guide the production of high-pe rformance PP/PE/PP lithium batteries separator.展开更多
文摘The heat-setting of carpet yarns is a necessary process if you want to obtain a high quality woven or tufted carpet. Different setting processes exist, each with its respective advantages and drawbacks (hot air, overheated steam, saturated steam under pressure).
基金financially supported by the National Natural Science Foundation of China(Nos.52173033,51773044 and51603047)Research and Development Plan for Key Areas in Guangdong Province(No.2019B090914002)+3 种基金Guangdong Province Science and Technology Plan Project(No.2016A010103030)the Project of Science Foundation of Guangdong Province(No.2021A1515011914)Foshan Science and Technology Innovation Project(No.FS0AA-KJ919-4402-0145)Commissioned development project by Lanzhou Chemical Research Center of Petro China(No.kywx-23-010,2022DJ6315)。
文摘Due to the mechanical stability of PP layer,the PP/HDPE double-layer microporous mem brane could be prepared at a higher heat-setting temperatu re than that of PE monolayer membrane.In this work,the effects of heat-setting temperature on the pore structure and properties of PP/HDPE dou ble-layer membrane were studied.With the increase of heat-setting temperature from 120℃to 130℃,the length of connecting bridge crystal and crystallinity in the PE layer increase due to the melting of thin lamellae and the stability of connecting bridge structure during heat-setting.The corresponding air permeability,po rosity,wetta bility of liquid electrolyte and mechanical property of the heat-set microporous membrane increase,exhibiting better electrochemical performance.However,when the heat-setting temperature is further increased to 140℃,higher than the melting point of PE resin,some pores are closed since the lamellae and connecting bridges melt and shrink during heat-setting,resulting in a decrease of air permeability and porosity.In contrast,there is negligible change in the PP layer within the above heat-setting temperature region.This study successfully builds the relationship between the stable pore structure and property of microporous membrane during heat-setting,which is helpful to guide the production of high-pe rformance PP/PE/PP lithium batteries separator.
