退火对LLDPE/MWCNTs超薄制品的增强增韧作用Toughening and Reinforcing Effect of Annealing on Ultra-thin LLDPE/MWCNTs Parts
石素宇;杨秀琴;赵康;冯孟非;燕世林;
摘要(Abstract):
通过微注射成型技术制备了线性低密度聚乙烯/多壁碳纳米管(LLDPE/MWCNTs)超薄制品,分别在55,70,85,100℃下退火3h。通过拉伸测试、差示扫描量热分析和X-射线衍射表征考察了退火对LLDPE/MWCNTs制品结构及力学性能的影响。结果表明:退火显著提高了LLDPE/MWCNTs超薄制品的拉伸强度和断裂韧性。退火诱导新晶体的形成,促进初级晶体的完善,提高制品的结晶度。基于微结构的变化,讨论了退火后LLDPE/MWCNTs超薄制品的增强增韧机理。
关键词(KeyWords): 退火;微注射成型;线性低密度聚乙烯;多壁碳纳米管;超薄制品;增强;增韧
基金项目(Foundation): 国家自然科学基金(51173171);; 河南工程学院博士基金项目(D2015018)
作者(Authors): 石素宇;杨秀琴;赵康;冯孟非;燕世林;
DOI: 10.19690/j.issn1004-3055.20180004
参考文献(References):
- [1]PIOTTER V,MUELLER K,PLEWA K,et al.Performance and simulation of thermoplastic micro injection molding[J].J Microsyst Technol,2002,8(6):387-390.
- [2]HEDESIU C,DEMCO D E,KLEPPINGER R,et al.Effect of temperature and annealing on the phase composition,molecular mobility,and the thickness of domains in isotactic polypropylene studied by proton solid-state NMR,SAXS,and DSC[J].Macromolecules,2007,40(11):3977-3989.
- [3]SAMON J M,SCHULTZ J M,HSIAO B S,et al.Structure development during melt spinning and subsequent annealing of polybutene fibers[J].J Polym Sci,Part B:Polym Phys,2000,38(14):1872-1882.
- [4]JIANG Z Y,TANG Y J,RIEGER J,et al.Structural evolution of melt-drawn transparent high-density polyethylene during heating and annealing:synchrotron small-angle X-ray scattering study[J].Eur Polym J,2010,46(9):1866-1877.
- [5]FERRER-BALAS D,MASPH M L,MARTINEZ A B,et al.Influence of annealing on the microstructural,tensile and fracture properties of polypropylene films[J].Polymer,2001,42(4):1697-1705.
- [6]SHI S Y,PAN Y M,LU B,et al.Realizing the simultaneously improved toughness and strength of ultra-thin LLDPE parts through annealing[J].Polymer,2013,54(25):6843-6852.
- [7]石素宇,许江伟,潘亚敏,等.退火对微注射成型超薄LLDPE制品的增强作用[J].现代塑料加工应用,2015,27(1):1-4.
- [8]LU Y,YANG W,ZHANG K,et al.Stress relaxation behavior of high density polyethylene(HDPE)articles molded by gas-assisted injection molding[J].Polym Test,2010,29(7):866-871.