| The application and development of polyester in many fields twaysl have been seriously affected because of its flammability. With polyethylene terephthalate(PET) as main raw material , choosing highly-effective blend system for flame retardance and adopting two-screw extruder as a new technology, we succeed in a new-typed polyester material for flame retardance. In this thesis, thermal behaviors, heat- degradation kinetics, and the relationship between smoke, heat release and char residue of PET and flame-retarding polyester by the combination of CONE with TG as a research method. A XLY-2 type capillary rheometer was used to study their rheological behaviorc and in addition, mechanical properties were studied by electronic verstatile experimental machine controlled by computer. On basis of majorized technology and proportion, artificial hair silk material was prepared which has been applied in artificial hair silk industry. Besides some valuable conclusions drawn are as folow: 1. In spite of the divergence of TG on CONE in experimented conditions, both results are in great agreement. SB/FR system can prompt the advance decomposition of flame-retarded earlier and char residue is raised and its maximum occurs as the ratio of flame-retarded varies , the prohition of thermal decomposition rise further by thermal insulation and oxygen insulation. 2. The kinetic analysis of PET and flame-retarding polyester leads to reaction actification energy(E) and frequency factor(lgA) in different weight loss ratio and this work above has never been reported. According to Time-Temperature Principle, the temperature-time curves for a series of constant weight loss rates are obtained, which offers scientifical proofs to establish the span for use at a certain temperature or the maximum temperature for use. 3. For the first time, CONE analysis under 5OkW.m2 show that the synergistic effect of SB/FR can lengthen time to ignition (TTI) , the maximum of which occurs with the variation of the composition of flame-retardant. At the composition, TTI is prolonged with the increase of the content of flame-retardant, which illustrates that the delay of TTI characterizes the gas-phase flame retardance for polymer. 4. Addition of the flame-retardant (SB/FR) reduce HIRR(HIEAT Release Rate ),TLIR(Total Heat Release and EHC (Effective Heat of Combustion) and in addition ,the time which is correspondent with the maximum HIRR is advance the correlation between both rate and content of heat release and both rate and content of mass loss, in fact ,result from the earlier formation of condensed phase into char and a rise in char residue, which shows the characteristics of condensed phase for flame-retardant. 5. SB/FR reduce SPR(smoke Production Rate), SP(Smoke Production), production of co and cc2 and toxicity of the polyester . As the composition of flame-retardant varies, TSP has a minimum and at the some composition SEA (specific Extinction Area) and TSP drop with the reduction of its content. 6. The influence of shear rate, shear stress and temperature on apparent melt viscocity of flame-retarding PET was studied and results show that apparent melt viscocity drops with the increasing of temperature, and so does activation energy for viscous flow (E) with the increasing of shear rate. At experimental temperature, the apparent melt viscosity decreases with the increasing of shear rate and shear stress and value of non-Newton index(n) is less than 1 , which indicates that melt of flame-retarding polyester... |
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