Crosslinking by high energy radiation

Polyethylene, both HDPE and LDPE, can be crosslinked by aU forms of high energy radiation [115 to 118]. When high energy radiation is passed through polymers, a large part of 

Alkyl/aryl peroxides Rj—O—O—R2 R=(R,=R2)=CH3 R = C2H5(R-C(CH3)202C(CH3)2-R) (CH3)3C0-0C(CH3)20-0C(CH3)3 R = CH2-CH2 R = C=C(CH3)3C0-0C(CH3)2-R-C(CH3)2-0- R = C(CH3)2C6H5 [(01 3)3—0—0—C(CH3)2]2C5H4 C6H5C(CH3)2-0-0-C(CH3)3 Di-tert-butylperoxide (DTBP) Di-tert-amylperoxide (DTAP) 2,2-bis(tert-butylperoxy)butane (BU) 2.5- dimethylhexane-2,5-di-ferf-butylperoxide (DHBP) 2.5- dimethyl-3-hexane-2,5-di-tert-butylperoxide (DYBP) Dicumylperoxide (DCUP) Bis-(2-terf-butylperoxyisopropyl)benzene (DIPP) Tert-butylcumylperoxide (BCHP) 

Peroxyesters Ri-C(=0)-0-0-R2 R = C,H5 R = CH3-(CH2)3-CH(C2H5)-R = (CH3)3-CH2-CH-CH2(CH3)- Tert-butylperoxybenzoate (TBPB) Tert-butylperoxy- 2 - ethylhexano ate (TBPEH) Tert-butyl-3,5,5-trimethylhexanoate (TBPIN) 

Ethyl- 3,3 - di( tert-b utylperoxy)b utyrate (EBU) l,3-di(tert-butylperoxy)-3,3,5-trimethyl-cyclohexane (TMCH) 

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Specific grades are crosslinkable by high-energy radiation. 

C 5. — Swelling properties of polystyrene crosslinked by high energy radiation. J. Polymer Sci. 11, 521 (1953). 

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