The swelling and dissolution behavior of ultra high molecular weight polyethylene (UHMWPE)/Liquid Paraffin (LP) system at different heating rates were studied by rotational rheometer and thermo-stage microscope.The results shown that the viscosity followed the same trend no matter what the heating rate was.When the heating rate was 1℃/min,the system swelled and melted while melting,and then dissolution.When the heating rate was 10℃/min,the melting rate of the resin crystallization zone was fast due to the faster heating rate.Before the resin was completely melted,swelling was hardly observed.the viscosity of the UHWMPE/LP system was divided into four stages with temperature changes:1)swelling stage;2)the early stage of dissolution;3)the late stage of dissolution;4)solution stage.Finally,combined with experimental phenomena,a structure evolution model was proposed to describe the swelling and dissolution behavior of UHMWPE/LP system at different heating rates.
[1] 黄式流.超高分子量聚乙烯管在长洲水利枢纽的应用[J].红水河,2017,36(2):108-111.
[2] Zheng Z,Tang X,Shi M,et al.A study of the influence of controlled corona treatment on UHMWPE fibres in reinforced vinylester composites[J].Polymer International,2010,52(12):1833-1838.
[3] Zhao C,He J,Li J,et al.Preparation and properties of UHMWPE microporous membrane for lithium ion battery diaphragm[J].2018,46(9):44-47,57.
[4] Lin P,Hu X,Min N,et al.Role of ultrahigh molecular weight polyethylene during rotation extrusion of polyethylene pipe[J].Industrial & Engineering Chemistry Research,2014,53(35):13828-13832.
[5] 王丽红,郝春波,刘福德,等.超高分子量聚乙烯管材的制备及应用[J].工程塑料应用,2007,35(11):44-47.
[6] Millerchou B A,Koenig J L.A review of polymer dissolution[J].Progress in Polymer Science,2003,28(8):1223-1270.
[7] 陈建军.干法纺丝用UHMWPE的性能剖析[J].合成纤维工业,2014,37(4):71-73.
[8] 张斌,赵炯心,张幼维,等.超高相对分子质量聚丙烯腈溶解的研究[J].东华大学学报(自然科学版),2002,28(1):111-115.
[9] 王新威,张玉梅,吴向阳,等.超高相对分子质量聚乙烯树脂的溶胀性能研究[J].合成纤维,2011,40(10):19-21.
[10] 运新华,侯秀红,张玉梅,等.溶胀对UHMWPE锂电池隔膜性能的影响[J].塑料工业,2016,44(7):147-152.
[11] Toda A,Masamichi Hikosaka,Koji Yamada.Superheating of the melting kinetics in polymer crystals:a possible nucleation mechanism[J].Polymer,2002,43(5):1667-1679.
[12] Rastogi S.Kinetics in melting of polymers[J].Journal of Coastal Research,2004,24(1A):201-205.
