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Citation: TANG Long-Xiang, YAN Man-Qing, LIU Chun-Hua, WANG Ping-Hua. Crystallization Behavior of UV-photocrosslinked High-density Polyethylene[J]. Chinese Journal of Applied Chemistry, ;2009, 26(9): 1019-1022. shu

Crystallization Behavior of UV-photocrosslinked High-density Polyethylene

1.
a College of Chemical Engineering, Hefei University of Technology, Hefei 230009;
2.
b College of Chemistry and Chemical Engineering, Anhui University, Hefei

Corresponding author: TANG Long-Xiang,
Received Date: 19 September 2008
Available Online: 28 March 2009
Fund Project: 国家自然科学基金(50573016)资助项目 (50573016)

High-density polyethylene(HDPE),a photoinitiator(benzil dimethyl ketal,BDK),and a cross-linker(triallyl isocyanurate,TAIC) were mixed at elevated temperature,and then a series of samples with different degrees of crosslinking were prepared by UV photocrosslinking under a high pressure mercury lamp.The effects of ultraviolet(UV) photocrosslinking on the crystal structure and non-isothermal crystallization kinetics were studied by means of X-ray diffraction(XRD) and differential scanning calorimetry(DSC).The results show that UV phtocrosslinking did not change the crystal type of the HDPE.However,the degree of crystallinity and the size of the crystals decreased with increasing UV irradiation time.With the cooling rate increasing,the crystalline peaks of both neat HDPE and photocrosslinked HDPE(XLPE) became wider,and the crystallization temperatures(T_p) moved toward lower temperature,the crystallization rate increased,and the degrees of crystallinity(X_c) were reduced.In comparison with un-photocrosslinked HDPE,XLPE possesses lower T_p,bigger F(T),smaller X_c and higher effective activation energy(ΔE),indicating that UV photocrosslinking suppresses the crystallization process of HDPE.
- photocrosslinked polyethylene,
- ultraviolet photocrosslinking,
- crystal structure,
- differential scanning calorimetry,
- nonisothermal crystallization kinetics
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