| 摘要 |
A terpolymer of ethylene, an a -olefin and a non-conjugated diene has <FORM:1110095/C3/1> groups in the polymer replaced by groups of formula <FORM:1110095/C3/2> wherein X represents a hydroxy group or the acid radical of an acid HX capable of opening an oxirane ring. The preferred a -olefin, other than ethylene, and diene are propylene and dicyclopentadiene respectively, other dienes specified being 1,4-hexadiene, 1,5-cyclo-octadiene and 5-methylenenorbornene-2. The terpolymer is epoxidized by treatment with an agent such as a peroxyacid. The epoxy rubber (EEP) may then be treated with an acid and the hydroxy rubber (HEP) produced subsequently treated with maleic anhydride to yield maleated rubber (MEP). Alternatively, the EEP is cross-linked with, e.g., BF3, a BF3 complex, AlCl3, AlBr3, SnCl4, HCl, HBr, H2SO4 or a carboxylic acid such as maleic, adipic or phthalic acid. The HEP may be cross-linked with a diisocyanate, e.g. toluene diisocyanate or a dianhydride such as pyromellitic anhydride. Cross-linking agents for the MEP include metal oxides, e.g. MgO, CaO and Na2O; diisocyanates, e.g. hexamethylene or toluene diisocyanate; an isocyanate-terminated polyesterdiol or polyetherdiol; or an organic diamine such as hexamethylene diamine, a phenylene diamine or p,p1-diaminodiphenyl methane. In the case of the MEP a cross-linking catalyst may be used, e.g. 1,4-diazobicylo[2.2.2]octane. In another embodiment, the MEP is graft polymerized with, e.g., styrene, a chlorinated styrene, divinyl benzene, (meth)acrylonitrile, methyl or ethyl (meth)-acrylate, vinyl acetate or vinyl pyridine by dissolving the MEP in the monomer and employing a free radical catalyst. Examples are given of the production of HEP and MEP rubbers from a terpolymer of ethylene, propylene and dicyclopentadiene, using peroxybenzoic acid or metachloroperoxybenzoic acid for epoxidation. The MEP produced is grafted with styrene or styrene and divinyl benzene, the catalyst being a mixture of methyl ethyl ketone peroxide and ferric acetyl acetonate, or benzoyl peroxide alone. |
