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| 折扣與優(yōu)惠：團(tuán)購最低可5折優(yōu)惠 - 了解詳情 | 論文格式：Word格式(*.doc) |  |
摘要：聚合物之間的相容性是選擇適宜共混方法的重要依據(jù)，也是決定共混物形態(tài)結(jié)構(gòu)和性能的關(guān)鍵因素。對混合狀態(tài)進(jìn)行精確的表征是研究聚合物共混體系的基礎(chǔ)。聚酯單絲用的高粘度聚對苯二甲酸乙二醇酯（PET）切片熔體流動(dòng)性能極差，通過共混改性的方法，在PET中添加一定量的端苯基超支化聚酯（HBP）以改善其流動(dòng)性。本實(shí)驗(yàn)采用結(jié)晶動(dòng)力學(xué)的方法評價(jià)了PET/ HBP共混物的相容性。結(jié)果表明，共混物的晶體生長速率(G)和成核速率(N)與過冷度和共混物組成有關(guān)。從結(jié)晶前后化學(xué)勢的變化與共混物組成的相關(guān)性以及從晶體生長速率和成核速率得到的結(jié)晶表面自由能參數(shù)（K，S）與共混物組成的相關(guān)性來看，所有共混物都是相容的，其中共混物組成在G3-HBP的含量達(dá)到6%前是完全相容體系，含量超過6%是部分相容體系；加入的HBP的代數(shù)在第三代前時(shí)共混體系是完全相容體系，之后則為部分相容體系。從相容性的角度進(jìn)一步解釋了HBP的加入對PET的加工流變性能的影響。隨著HBP用量的增加，PET的塑化扭矩和平衡扭矩減小，塑化時(shí)間先減小后增大；隨著HBP代數(shù)的增加，PET的塑化扭矩和平衡扭矩減小，塑化時(shí)間也是先減小后增大。極性適中的端苯基超支化聚酯對PET的加工兼具內(nèi)-外潤滑作用。 關(guān)鍵詞：聚對苯二甲酸乙二醇酯；端苯基超支化聚酯；結(jié)晶動(dòng)力學(xué)；相容性
Abstract：The miscibility between the polymers is the critical factors in determining the suitable blending methods and the morphology and properties of the blends. The precise characterization of the mixed state is the basis of the study of polymer blends. The melt flow performance of the high viscosity poly(ethylene terephthalate)(PET) used as polyester monofilament is poor. The mobility of the PET adding a certain amount of phenyl-terminated hyperbranched polyesters (HBP) can be improved by the blending method. In this study, the miscibility of PET/HBP blends were evaluated by isothermal crystallization kinetics. The results showed that the crystal growth rate (G) and nucleation rate (N) of the blends were connected to the degree of supercolling and the composition of the blends. All the blends are compatible systems judging from the chemical potential changes in the crystallization and the surface free energy parameters of the crystallization (K,S) which determined by the crystal growth rate (G) and nucleation rate (N) connected to the composition of the blends. When the content of G3-HBP achieves to 6% or the generation of HBP reachs the third generation, the blends will change from miscible systems to partially miscible systems. Further, the rheological properties changes of the PET/HBP blends can be explain from the miscibility. The plasticizing torque and balancing torque of PET decreased with the increase of the content of hyperbranched polyester, with the plasticizing time decreasing first and then increasing. The plasticizing torque and balancing torque of PET decreased with the increase of the generation of hyperbranched polyester, with the plasticizing time decreasing first and then increasing. Phenyl-terminated hyperbranched polyesters with moderate polarity have inner-external lubricating effect on PET. Key words：polyethylene terephthalate；phenyl-terminated hyperbranched polyesters；isothermal crystallization kinetics；miscibility
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