聚丙烯/复合发泡剂的在线流变行为研究
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摘要
采用双螺杆挤出机安装狭缝机头,在聚丙烯(PP)熔体中注入发泡剂进行在线流变实验,研究不同含量的二氧化碳(CO_2)、CO_2/乙醇、CO_2/水对PP剪切黏度的影响。结果表明,3种发泡剂溶解进入PP,质量分数相同的情况下,水对PP塑化程度最高,CO_2次之,乙醇最低,由实验推导出了不同工艺条件下PP/复合发泡剂体系剪切黏度计算公式。
The on-line rheological behavior of polypropylene and composite blowing agent were studied by using a twin extruder with slit die. The effects of different contents of carbon dioxide(CO_2),CO_2/ethanol and CO_2/water on the shear viscosity of PP were investigated. The experimental results demonstrate that under the same mass fraction of blowing agent dissolved into PP melt,water had the highest degree of plasticization to PP,followed by CO_2,and ethanol was the lowest. The equations of shear viscosity of PP & composite blowing agent system were deduced based on the experiment data under different technological conditions.
The on-line rheological behavior of polypropylene and composite blowing agent were studied by using a twin extruder with slit die. The effects of different contents of carbon dioxide(CO_2),CO_2/ethanol and CO_2/water on the shear viscosity of PP were investigated. The experimental results demonstrate that under the same mass fraction of blowing agent dissolved into PP melt,water had the highest degree of plasticization to PP,followed by CO_2,and ethanol was the lowest. The equations of shear viscosity of PP & composite blowing agent system were deduced based on the experiment data under different technological conditions.
引文
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[11]万辰.超临界CO2环境下聚乙烯的流变特性及其影响发泡行为的作用机制[D].上海:华东理工大学,2017.
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[14]牛应买,罗宇,毛秦岑,等.CAB/PBAT熔融体系流变性能的研究[J].合成材料老化与应用,2018,47(2):49-52.
[15]丁亚军,应三九.螺杆挤出过程中物料在线流变行为及其数值模拟[J].兵工学报,2015,36(8):1437-1442.
[16]WANG J,PARK C B.Pressure profile in annular die using PP/CO2solution viscosity[J].Cell Polym,2008,27(3):147-164.
[2]HOPMANN C,HENDRIKS S,FELDGES R.Foam extrusion of LDPE with solid phase CO2as blowing agent[J].Polym Eng Sci,2016,55(12):2821-2828.
[3]WANG M,XIE L,QIAN B,et al.Extrusion foaming behavior of a polypropylene/nanoclay microcellular foam[J].J Appl Polym Sci,2016,133:44094.
[4]张泉.发泡聚丙烯生产技术与市场分析[J].橡塑技术与装备,2016(4):20-23.
[5]TOMASKO D L,BURLEY A,FENG L,et al.Development of CO2,for polymer foam applications[J].JSupercrit Fluids,2009,47(3):493-499.
[6]LIU S,DUVIGNEAU J,VANCSO G J.Nanocellular polymer foams as promising high performance thermal insulation materials[J].Eur Polym J,2015,65:33-45.
[7]GUO Z,YANG J,WINGERT M J,et al.Comparison of carbon nanofibers and activated carbon on carbon dioxide foaming of polystyrene[J].J Cell Plast,2008,44(6):453-468.
[8]LUO Y W,XIN C L,SUN J,et al.Study on the foaming behavior of PS-CO2by using water or ethanol as co-blowing agent[J].Adv Mater Res,2013,748:112-116.
[9]BOUMA R H B,NAUTA W J,ARNAUTS J E F,et al.Foam stability related to polymer permeability.I.Low molecular weight additives[J].J Appl Polym Sci,2015,65(13):2679-2689.
[10]HENDRIKS S,HOPMANN C,ZEPNIK S.Extrusion foaming of thermoplastic cellulose acetate sheets with HFO-1234ze and co-blowing agents[J].Polym Eng Sci,2018,58,24850.
[11]万辰.超临界CO2环境下聚乙烯的流变特性及其影响发泡行为的作用机制[D].上海:华东理工大学,2017.
[12]LEE M,PARK C B,TZOGANAKIS C.Measurements and modeling of PS/supercritical CO2solution viscosities[J].Polym Eng Sci,1999,39(1):99-109.
[13]陈鸣鸣,信春玲,郭奕崇,等.聚苯乙烯/CO2的在线流变行为研究[J].塑料,2008,37(5):56-59.
[14]牛应买,罗宇,毛秦岑,等.CAB/PBAT熔融体系流变性能的研究[J].合成材料老化与应用,2018,47(2):49-52.
[15]丁亚军,应三九.螺杆挤出过程中物料在线流变行为及其数值模拟[J].兵工学报,2015,36(8):1437-1442.
[16]WANG J,PARK C B.Pressure profile in annular die using PP/CO2solution viscosity[J].Cell Polym,2008,27(3):147-164.