| The polycarbonate (PC) is a kind of noncrystalline and thermoplastic resin with good comprehensive function type, having an excellent electricity insulation, extension, transparent, size stability, high impact resistance and corrosion stability, thermal resistance and cold resistance; Still have self-extinguish, apyrous, nonpoisonous, sanitary and pigmentation strongpoint etc, so the dosage of PC is the second which is less than PA in the engineering plastic.2001 Year ago, the PC was one of engineering plastic which increase quickest in the need in the world. But the PC still exist much weakness, such as having a higher mucosity, difficult processing, difficult in create large ware, easy craze, and is worse in diffluence, abrasion, boil and aging. The PC raises a bubble in the heat. The function of the transparent PC products grow worse, such as pound at strength to lower, product surface cracked, be suffused with Huang combine the sheen lose, because of the hot air or the hot water aging in the storage, process and usage process, with as for influence normal usage.The dimethylsiloxane that flexibility of molecule chain is very high have thermal resistance, low temperature, weatherability, an excellent electricity insulation, low surface tension and low surface ability, The essence of dimethylsiloxane is apyrous, because of creating silicon dioxide when burning; And the gas belong to low poisonous scope; The surface tension is very low, so dimethylsiloxane can improve effectively the sport ability of polymer chain segment. These advantages of dimethylsiloxane make up PC's weakness at the right moment. eugenol-siloxane/PC copolymer can raises significantly PC's function at the situation that keep transparent, so it has huge applied foreground in the PC's function. The eugenol-siloxane polymer becomes a kind of important PC additive at abroad, which is used for improving PC's process mobility, indentation sensitivity, fire retardant, low temperature impact etc. Polysiloxane-polycarbonate block copolymers are announced in the mid 60's 19 centuries for the first time. This polymer has outstanding thermal resistance, weatherability and flame retardance, having high impact resistance and good liquidity under the low temperature. According to the chain segment of eugenol-siloxane is different in the length and proportion, copolymer could be transparent, translucent and opaque.This paper probe into the effective method of making excellent Polysiloxane-polycarbonate block copolymers, and research primarily the preparation of environmental and transparent PC modifier and alogen-free flame-retardant, this paper introduces a method how to synthesize eugenol-siloxane that has phenol hydroxylation in its molecule chain, the method uses hydrosilation that takes place between eugenol and hydrosilicone oil, when the platinum activator is introduced to chemical reaction system; And this paper studies primarily the influence factor of the born rate. The article also investigates the influence of the eugenol-siloxane on the capability of polycarbonate (PC), after the eugenol-siloxane and PC together mix both in the state of being melted. The result of research is that mixed eugenol-siloxane is better effectually the fluidity of PC. Then, this paper introduces the method that synthesizes Polysiloxane-polycarbonate block copolymers by melt transesterification, and this paper studies primarily the influence factor of the born rate of the siloxane. The most honorable is that this paper introduces a new method to systhize eugenol-siloxane copolymer. That method hasn't been mentioned in any patent ofrecordation inside and outside. At last this paper introduces a method how to synthesize epoxy-modified polysiloxane, the method uses hydrosilation reaction that takes place between allyl glycidyl ether and low hydrogen-contg. Silicone oil, then synthesizes Polysiloxane-polyearbonate block copolymers using PC reaction of epoxy-modified polysiloxane and hydroxyl-ended. |
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