采用溶胀悬浮聚合法制备低密度聚乙烯/聚苯乙烯(LDPE/PS)互聚物,研究了苯乙烯(St)溶胀LDPE的条件以及聚合温度、引发剂过氧化苯甲酰(BPO)含量、聚合时间对LDPE/PS互聚物的影响。结果表明:St溶胀LDPE的最佳条件为温度40℃、溶胀时间150min;在聚合温度90℃、聚合时间9h、引发剂BPO质量分数为1%条件下,St转化率高达90%。全反射傅里叶变换红外光谱分析证明LDPE/PS互聚物中含有低密度聚乙烯接枝聚苯乙烯(LDPE-g-PS)共聚物,其质量分数为1.21%;扫描电子显微镜分析表明PS以不规则的颗粒状分布在LDPE基体中。LDPE/PS互聚物用超临界CO2发泡,在发泡压力2.5MPa、发泡温度120℃条件下,互聚物具有良好的发泡能力。
A method to prepare low-density polyethylene (LDPE)/polystyrene (PS) interpolymer by swelling suspension polymerization was developed.The swelling details,polymerization temperature,polymerization time,initiator concentration were investigated.The results showed that the optimal swelling conditions were 40℃,150min,monomer conversion was up to 90% under the optimum polymerization temperature,initiator BPO content and polymerization time were 90℃,1% and 9 h,respectively.FT-IR analysis confirmed that a small amount of LDPE-g-PS was existed in the LDPE/PS interpolymer,the content of LDPE-g-PS was about 1.21%.Scanning electron microscopy revealed that PS was mainly distributed in LDPE matrix with irregular granular.Using the supercritical carbon dioxide to foam LDPE/PS interpolymer,the result indicated that LDPE/PS interpolymer had good foaming capacity at foaming pressure of 2.5MPa and foaming temperature of 120℃.
[1] 刘本刚,赵哲晗,何路东.不同高密度聚乙烯发泡体系的挤出发泡行为研究[J].中国塑料,2011,25(3):70-74.
[2] Guo P,Xu Y,Lu M.Expanded linear low-density polyethylene beads:fabrication,melt strength,and foam morphology[J].Industrial & Engineering Chemistry Research,2016,55(29):8104-8113.
[3] 邓小波,于广和.绝热用模塑聚苯乙烯泡沫塑料燃烧特点分析[J].化工新型材料,2013,41(11):183-184.
[4] 林增祥,张华集,张雯.POE增韧改性LDPE高发泡弹性材料的研究[J].化工新型材料,2010,38(5):82-84.
[5] 张求慧.新型木塑复合材料研究进展[J].化工新型材料,2014,42(2):6-8.
[6] 温时宝,罗方向,赵文婷.EPO泡沫塑料及其应用[J].塑料包装,2010,20(3):31-33.
[7] 刘本刚,刘燕,杜中杰.PS/PLA共混物的相态结构及其发泡行为研究[J].中国塑料,2015,29(4):36-41.
[8] 温时宝.EPO泡沫的静态压缩性能及其与EPS和EPE泡沫的比较[J].包装工程,2010,31(19):10-12.
[9] S·M·克鲁平斯基.互聚物树脂颗粒:中国,200480040866.X[P].2007-01-31.
[10] Krupinski S M.Interpolymer resin particles:US,7906589[P].2011-03-15.
[11] 方婷.ARCEL@发泡塑料缓冲包装材料新成员[J].印刷技术,2014,3(6):45-46.
[12] Lee S T.Study of PP/PS interpolymer foam rod extrusion;surface and cell wall quality[J].Journal of Cellular Plastics,2010,46(4):321-331.
[13] 宫峰,谷庆风,何培新.悬浮溶胀法制备CPE-g-GMA接枝共聚物[J].高分子材料科学与工程,2009,26(7):16-22.
[14] Lin W,Biegler L T,Jacobson A M.Kinetic modeling of semi-interpenetrating polymer network (SIPN) process-a comprehensive study on the case of polyethylene/polystyrene semi-I IPN[J].Macromolecular Theory and Simulations,2011,20(2):146-165.
[15] Huang C,Tan Y,Guo Z.Diffusion and polymerization behavior of styrene in polyethylene pellets of different molecular structures[J].Chemical Journal of Chinese Universities,2018,39(3):558-565.
[16] 徐建平,刘春林,龚方红.LLDPE反应挤出接枝苯乙烯的研究[J].合成树脂及塑料,2000,17(2):10-13.
[17] 陈放,姚雪容,郭朝.苯乙烯对高密度聚乙烯的扩散聚合行为研究[J].高分子学报,2016,12(12):1717-1723.
[18] Chen F,Guo Z X,Yu J.Polymerization kinetics of styrene in isotactic polypropylene pellets and evolution of phase morphology during polymerization[J].J Appl Polym Sci,2016,133(37):43934.
[19] 谢慧芳,张琳,马卫华.PS及其共混复合体系超临界CO2发泡行为研究[J].工程塑料应用,2014,42(1):44-50.
[20] 信春玲,何亚东,李庆春.影响聚丙烯发泡倍率和泡孔结构的主要工艺参数研究[J].塑料,2008,37(2):1-7.
基金资助
“十二五”支撑计划课题(2015BAD16B06-2)
PDF
(6558KB)
