何山大组会-1-10

1、The influence of thermal treatment on the hierarchical structure of HDPE in GAIM Student: Shan He Surpervisor: Mingbo Yang 2015-1-10Melt fillingGas delay timeGas injectionGas-assisted packingDemoldingGAIM cycle Advantages clamping tonnage cycle time material consumption etcBackgroundBackgroundProces

2、s parameter delay time mold temperture melting temperture gas pressure(a)(b)(c)(d)Schematic representation for the classification of HDPE parts: (a) skin layer; (b) sub-skin layer; (c) intermediate layer; and (d) gas channel zone1 Material polymer/polymer blendsPC/PE PA/PE HDPE/HDPE HDPE/LLDPE Backg

3、round polymer/filler blendsGF/PA GF/PP HDPE/MWCNT Single component polymerMolecular weight distributionLong chain branchRadiation cross-linkingExprimentsGAIMGAIMThermal treatment(280,2.5h,5h,10h)HDPEMelt temperature () 210Mold temperature () 40Shot size (%)80Gas pressure (MPa)10.4Gas delay time (s)1

4、Gas injection time (s)20Table .1 Processing parameters of the GAIM processesResults and disscusionsionFTIRXRDSSAResults and disscusionsionResults and disscusionsionDSCResults and disscusionsion(a)(b)(c)Rheological property (a)5mshish-kebab5m(b)shish-kebab5m(c)Oriented lamella(d)5mSpheruliteNeat60982

5、.5H5mshish-kebab(a)5mshish-kebab(b)5mOriented lamellaSpherulite(c)5mOriented lamellaSpherulite(d)Results and disscusionsion10H5H5m(b)shish-kebab5m(a)shish-kebab(c)5mshish-kebab(d)5mOriented lamella5m(a)shish-kebab5m(b)shish-kebab5m(c)Oriented lamella5m(d)Oriented lamellaResults and disscusionsionResults and disscusionsionTensile testHypothetical mechanism Thermal treating can reduce the contents of short chain branch(SCB) in HDPE.With the reduce of the contents of SCB,the HDPE samp