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Research on Radiation Crosslinking under Electron Beam of High Density Polyethylene with Sensitizers

Author: MengWeiTao
Tutor: YuanHuiLin
School: Beijing University of Chemical Technology
Course: Materials Science and Engineering
Keywords: High density polyethylene Radiation crosslinking Radiation dose Pentaerythritol triacrylate Triallyl isocyanurate The degree of crosslinking
CLC: TQ325.12
Type: Master's thesis
Year: 2011
Downloads: 37
Quote: 1
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Abstract


Excellent performance, high-density polyethylene (HDPE) and a wide range of applications , now put a higher demand heating with the use of hot and cold water pipes and other areas of HDPE performance . Crosslinking is an effective way to improve the performance of HDPE is a radiation crosslinked polymer . The sensitizing agent can effectively promote the radiation crosslinking of the polyethylene , to reduce HDPE desired radiation dose . This study, the high - energy electron beam radiation crosslinking technology add polyfunctional monomers sensitizer and antioxidants 300 HDPE system radiation crosslinking effect . Pentaerythritol triacrylate (PETA) , and triallyl isocyanurate isocyanurate (TAIC) two polyfunctional monomers sensitizer used alone the effects of radiation crosslinking of HDPE and the compound used . By measuring the performance of the sample after radiation cross-linking degree , tensile strength , the right-angled tearing strength , the emphasis on the dose of radiation sensitizer content of HDPE radiation crosslinked ; using differential scanning calorimetry (DSC), and thermal gravimetric analysis (TG) to study the crystallinity and thermal stability of the HDPE after irradiation ; infrared (IR) analysis of the changes in the observed HDPE radiation characteristic groups . The study results show that : (1) the radiation dose and sensitizer has a key role to improve the degree of crosslinking of high - density polyethylene radiation . The radiation dose can be increased HDPE radiation cross -linking degree is increased within a certain range . Pentaerythritol triacrylate and triallyl isocyanurate , radiation cross -linking degree of HDPE are promoting. Sensitizer , HDPE can be less than 13kGy radiation dose after irradiation for more than 60% of the degree of crosslinking . (2) compared with pure HDPE radiation add sensitizer HDPE system after irradiation crystallinity changed little, while the thermal stability is improved . (3) TAIC sensitized activity higher than PETA, radiation crosslinking promoting effect more effectively on the HDPE ; HDPE up to 82% of the degree of crosslinking can be imparted in the radiation dose of 7 KGy .

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CLC: > Industrial Technology > Chemical Industry > Synthetic resins and plastics industry > Polymer resin and plastic > Polyolefin plastic > Polyethylene
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