高电压技术
高電壓技術
고전압기술
HIGH VOLTAGE ENGINEERING
2012年
3期
684-690
,共7页
徐明忠%赵洪%吉超%杨佳明%张文龙
徐明忠%趙洪%吉超%楊佳明%張文龍
서명충%조홍%길초%양가명%장문룡
纳米复合材料%氧化镁%低密度聚乙烯%空间电荷%拉伸性能%结晶度
納米複閤材料%氧化鎂%低密度聚乙烯%空間電荷%拉伸性能%結晶度
납미복합재료%양화미%저밀도취을희%공간전하%랍신성능%결정도
nanocomposite%magnesium oxide%low density polyethylene%space charge%tensile property%crystallinity
为了降低低密度聚乙烯中的空间电荷积累,在自制纳米MgO粉体的基础上,采用熔融共混法,制备了氧化镁/低密度聚乙烯(MgO/LDPE)纳米复合材料,并通过扫描电镜(SEM)观察了MgO/LDPE纳米复合材料中的MgO粒径大小和分散情况,采用差热扫描量热法(DSC)确定了不同MgO质量分数纳米复合材料的结晶度,采用电声脉冲法(PEA)测量了不同MgO质量分数纳米复合材料的空间电荷分布,测量了不同MgO质量分数纳米复合材料的拉伸性能。试验结果表明,MgO/LDPE纳米复合材料体系中,MgO粒径约为50nm,且分散均匀;不同MgO质量分数纳米复合材料的弹性模量和抗张强度均高于纯LDPE的,且MgO质量分数为2%时达到最大值;不同MgO质量分数纳米复合材料的结晶度均高于纯LDPE的;纳米MgO能抑制空间电荷的注入和其在材料体内的迁移,质量分数为3%时,MgO/LDPE纳米复合材料中的空间电荷得到了良好的抑制。
為瞭降低低密度聚乙烯中的空間電荷積纍,在自製納米MgO粉體的基礎上,採用鎔融共混法,製備瞭氧化鎂/低密度聚乙烯(MgO/LDPE)納米複閤材料,併通過掃描電鏡(SEM)觀察瞭MgO/LDPE納米複閤材料中的MgO粒徑大小和分散情況,採用差熱掃描量熱法(DSC)確定瞭不同MgO質量分數納米複閤材料的結晶度,採用電聲脈遲法(PEA)測量瞭不同MgO質量分數納米複閤材料的空間電荷分佈,測量瞭不同MgO質量分數納米複閤材料的拉伸性能。試驗結果錶明,MgO/LDPE納米複閤材料體繫中,MgO粒徑約為50nm,且分散均勻;不同MgO質量分數納米複閤材料的彈性模量和抗張彊度均高于純LDPE的,且MgO質量分數為2%時達到最大值;不同MgO質量分數納米複閤材料的結晶度均高于純LDPE的;納米MgO能抑製空間電荷的註入和其在材料體內的遷移,質量分數為3%時,MgO/LDPE納米複閤材料中的空間電荷得到瞭良好的抑製。
위료강저저밀도취을희중적공간전하적루,재자제납미MgO분체적기출상,채용용융공혼법,제비료양화미/저밀도취을희(MgO/LDPE)납미복합재료,병통과소묘전경(SEM)관찰료MgO/LDPE납미복합재료중적MgO립경대소화분산정황,채용차열소묘량열법(DSC)학정료불동MgO질량분수납미복합재료적결정도,채용전성맥충법(PEA)측량료불동MgO질량분수납미복합재료적공간전하분포,측량료불동MgO질량분수납미복합재료적랍신성능。시험결과표명,MgO/LDPE납미복합재료체계중,MgO립경약위50nm,차분산균균;불동MgO질량분수납미복합재료적탄성모량화항장강도균고우순LDPE적,차MgO질량분수위2%시체도최대치;불동MgO질량분수납미복합재료적결정도균고우순LDPE적;납미MgO능억제공간전하적주입화기재재료체내적천이,질량분수위3%시,MgO/LDPE납미복합재료중적공간전하득도료량호적억제。
To decrease the accumulation of space charge in low density polyethylene(LDPE),we prepared magnesium oxide(MgO)/ LDPE nanocomposites by mixing melted LDPE and MgO nano-powder.The dispersion and particle size of MgO in MgO/LDPE nanocomposites were characterized by scanning electron microscope(SEM),the crystallinity of MgO/LDPE nanocomposites with different contents of MgO was determined by using differential scanning calorimetry(DSC),the space charge distribution of MgO/LDPE nanocomposites with different content of MgO was measured by using pulse electro-acoustic(PEA),and the tensile properties were measured.The experimental results reveal MgO particles with diameters of about 50 nm are well dispersed in MgO/LDPE nanocomposites.The elastic modulus and tensile strength of LDPE/MgO nanocomposites with different content of MgO are higher than those of pure LDPE,and reach the maximum at the MgO loading of 2%.The crystallinity of MgO/LDPE nanocomposites with different contents of MgO is higher than that of pure LDPE.The space charge injection and mobility of MgO/LDPE nanocomposite can be suppressed by nano MgO loading,and the space charge of MgO/LDPE nanocomposite is effectively suppressed at the MgO loading of 3%.