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PET production process , often happens adhesion of the film , will be additive , caused by the decline in transparency paper treatment of SiO 2 ultrasonically dispersed in EG , then semi-continuous esterification prepared PET SiO 2 by IR, TG characterization of PET performance test using DSC, X-ary . Powder superfine powder particle size analysis and treated , the changes show that the long-term placement SiO 2 surface energy effect will occur reunion . SiO 2 surface modification and after ultrasonic treatment , to achieve , the effective increase SiO in 2 dispersed in EG uniformity , but the increase of ultrasonic time , evenly dispersed The degree of increase, the particle diameter becomes smaller . By TGA and IR test , the modified SiO 2 compared to a significant change in its absorption peak and modified before and after weight loss curve significantly different , and these show that the SiO 2 KH-570 undergoes a chemical reaction , KH-570 when SiO 2 KH-570 1:1 SiO 2 surface completely package coverage through the modification of PET the SEM tests show , the modified SiO 2 can be uniformly dispersed in the PET , with SiO 2 increase in the amount of dispersion deteriorates with increasing ultrasonic time , a dispersing effect becomes . Calculated by the intrinsic viscosity of the test , the intrinsic viscosity and molecular weight of the nanocomposites gradually decreased with the increase of the content . DSC testing showed SiO 2 < / sub > Join the increase in the amount of PET Tg , Tc decreased , Tm increased and then decreased . Tests showed that the performance of PET crystallization SiO 2 play the role of a nucleating agent in the PET , increase with SiO 2 added in an amount of , crystallization rate becomes faster and crystallization degree increase.
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