Synthesis And Properties Of Polyether Modified Polysiloxane

Polyether modified polysiloxane is an organosilicone surfactant with excellent performance, so it is widely used in such areas as foam stabilizers for polyurethane foams, cosmetic materials, textile finishing agent, cosmetic materials, emulgators and so on.In this paper, polyether modified polysiloxane was synthesized with polyhydrosiloxanes and allyl polyether as the raw material and chloroplatinic acid as catalyst, characterized by means of GPC, FT-IR and 1H-NMR. The influences of reaction temperature, reaction time and heating up time on the conversion degree, molecular weight of copolymer and molecular weight distribution by using using homogeneous design experimental project and single factor experiments. The most optimum synthetic conditions is:the reaction temperature is 125℃, the heating up time and the reaction time is 1h.With the optimized reaction condition, Different kinds of copolymers were synthesized with three kinds of polyhydrosiloxanes and fourteen kinds of allyl polyethers as the raw material. The influences of the molecular weight, the value of m/n of backbone polysiloxane, and the grafting density (i.e. hydrogen content), as well as the sequence of polyether structure (the value of EO/PO) and polyether molecular weight on hydrosilylation reaction was studied by use of GPC. The result shows the influences of reactants structure on hydrosilylation reaction is as follows:with the reduction of containing hydrogen content, reaction activity increases. When the structure of allyl polyether is the same and the value of EO/PO of the allyl polyether is large, if the molecular weight of the polyhydrosiloxane increases, the hydrosilylation reaction activity increases. When the structure of polyhydrosiloxane is the same, if the value of EO/PO of allyl polyether decreases, the hydrosilylation reaction activity increased. When the structure of allyl polyether is the same and the value of EO/PO of allyl polyether is large, if the molecular weight of polyhydrosiloxane increases, the polyhydrosiloxane conversion ratio decreases. When the structure of polyhydrosiloxane and the value of EO/PO of allyl polyether is the same, the polyhydrosiloxane conversion ratio decreased with the increasing of polyether molecular weight. When the structure of polyhydrosiloxane and the molecular weight of allyl polyether is the same, the polyhydrosiloxane conversion ratio decreased with the increasing of the value of EO/PO of allyl polyether. When the structure of allyl polyether is the same, if the molecular weight of polyhydrosiloxane decreases, the molecular weight distribution of copolymer narrowed. When the structure of polyhydrosiloxane and the value of EO/PO of allyl polyether is the same, the molecular weight distribution of copolymer narrowed with the increasing of polyether molecular weight. When the structure of polyhydrosiloxane and the molecular weight of allyl polyether is the same, the molecular weight distribution of copolymer narrowed with the decreasing of the value of allyl polyether EO/PO.Generally speaking, the structure of copolymer determines its main properties and application performance. Effect of the structure of copolymer on its self-assembling performance such as CMC and diameter of micelles in watery environment was investigated by the means of changing the structure of polyether modified polysiloxane such as the molecular weight of main chain polysiloxane and side chain polyether, the value of EO/PO and type of terminal groups of polyether. The results show the relationship between structure and its performance as follows:when the grafting number and the structure of side chain polyether is the same, with the increasing of the molecular weight of main chain polysiloxane, the CMC of copolymer decreases, and the diameter of copolymer micelles increases. When the structure of main chain polysiloxane and the value of EO/PO of side chain polyether is the same, with the increasing of the molecular weight of side chain polyether, the diameter of copolymer micelles increased. When the structure of main chain polysiloxane and the molecular weight of side chain polyether is the same, with the increasing of value of EO/PO of side chain polyether, the diameter of copolymer micelles increased. The molecular weight and the value of EO/PO of side chain polyether is not very influential on the CMC of the copolymer. If the structure of the copolymer is the same, and its terminal groups of side chain polyether varies, when the terminal group is n-butyl, the copolymer could form the larger aggregation, so it has larger CMC and micelle diameter than other types of copolymer.