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subsequently, 1.3 parts by weight of titanium tetrabutoxide as the polycondensation catalyst, and 0.065 parts by weight of trimethyl phosphite as the thermal stabilizer were added and polycondensed at 270 oc under reduced pressure of 66.7 pa (0.5 torr) to obtain a polymer.
posteriormente, se añadieron 1,3 partes en peso de tetrabutóxido de titanio como catalizador de policondensación y 0,065 partes en peso de fosfito de trimetilo como estabilizador térmico, y se policondensaron a 270 oc a presión reducida de 66,7 pa (0,5 torr) para obtener un polímero.