Study Of Design Synthesis And The Properties Of Starriness Antioxidants

Antioxidants are those compounds which can pervent or postpond oxidation of organic materials.It is very important stabilizing additives in polymer.Hindered phenolic antioxidant is one of primary antioxidants.It is used extensively in elastomers, dopes and bonds.It have many chaterastics as good effect of oxidantion resisting,high heat stability,no pollute and no colour up in plastic,good consistant with polymers. At the present time hindered phenolic antioxidant is most used and dosage maximal antioxidant. The development and research of hindered phenolic antioxidant are hotspot in the field of macromolecule.Dendrimer is a entirely new type of chemistry configurable polymer which have been expended over decades.it has particular configuration, The surface terminal group can carry on function transform which can obtain many newly functional dendrimers. Its specialties are to design the molecular size, shape and functional group at the molecular level.The text adopts divergent method, PAMAM with ethylenediamine core and with hexanediamine core 1.0 generation dendrimers were prepared. PAMAM with ethylenediamine core the optimal best reaction condition is: 25℃,12h, Molar proporation 32:1, on the condition the yield of the reaction is 99.9%. A new-type1.0 generation dendrimer with hexanediamine as core has been synthesized. And the effect of reaction temperature, time ,Molar proporation on the reaction yield was studied . the optimal best reaction condition is : 50℃, 12 h, Molar proporation 6:1. on the condition the yield of the reaction is 69.94%. A new method of terminal group transform of dendrimers was put forward for the first time. The method is that oxidation-resisting functional groups were grafted into two dendrimers by molecule design. The oxidation resisting functional intermediate compoundβ-(3,5-diterbutyl-4-hydroxyphenyl) propionyl chloride (3,5-propionyl chloride) was synthesized withβ-(3,5-diterbutyl-4-hydroxyphenyl) methyl propionate as raw material via hydrolytic reaction and replacement reaction. The starriness antioxidant A and starriness antioxidant B were synthesized via grafting 3,5-propionyl chloride into two 1.0 generation dendrimers. The reaction conditions were researched and optimized. The effects of the solvent, chelated reagent, reaction temperature, reaction time, reaction molar ratio on yield were examined. At last the best reaction condition was found: used trichloromethane as the solvent and triethylamine as the chelated reagent, the reaction molar ratio was 8:1, at ice water added the 1.0G, and at 30℃the reaction last for 12h. On the condition the yield of the starriness antioxidant A is 67.6%. On the condition the yield of the starriness antioxidant B is 60.12%.The molecular structure of the two antioxidants have been characterized by means of element analysis and infrared spectrum(IR). The molecular structure of the two antioxidants are proved to match with the designing target molecular basically.The starriness antioxidant A was evaluated in LLDPE and PP, The starriness antioxidant B was evaluated in LLDPE to determine the Oxidation Induction Time(OIT), the Melt Flow ration(MFR), they were compared to the commercial irganox 1010 and 1098. The conclusion is drawn that the two antioxidants are of oxidation resisting function and superior to antioxidant 1010. The starriness antioxidant A and assistant irganox 168 synergistic was evaluated in LLDPE. The conclusion is drawn that synergistic antioxidation properties in LLDPE is the best one compare with irganox 1010 and 1098 assistant irganox 168 synergistic.