Preparation And Properties Of Novel Phosphate Glass/Polymer Hybrids

In this article, the preparation of phosphate glass (Pglass) was discussed, andsome influencing factors on its glass transition temperature (Tg) were also analysed.The structure and morphology of tin fluorophosphates glass (TFP) as filler wasstudied, and its hybrids with the strong polar nylon66(PA66), the nonpolar lowdensity polyethylene (LDPE) and the low density polyethylene grafted maleicanhydride (LDPE-g-MAH) were prepared. The effect of polymer polarity on hybridproperties was explored.The preparation and property of Pglass: one step melting method was uniformmixing, simple and convenient, despited of the bigger error tatio of components. Twostep melting method can accurately gauge the reactants with complex and long cycleoperation. The increasing melting temperature, the growing melting time, thedecreasing percentage content of F element and the introduction of lead metal cationin raw materials can lead to the increased Tg of Pglass. The IR analysis showed thatthere were plenty of-OH and P-F groups, which is beneficial to its compatibility withthe strong polar polymer. Morphology ananlysis suggested that TFP particles withwider size distribution were in all shapes and sizes.There was strong interaction between the-OH of TFP and the-NHCO-of PA66in TFP/PA66hybrids. A reduction of Tg of PA66with30%TFP was about13℃, andthe third relaxation respecting to the Tg of TFP appeared at130℃. The storagemodulus of the hybrid was nearly identical and independent of the glass content athigh temperature unlike the growth of those at low temperature. Meantime, theaddition of TFP leaded to the decreased crystallizing rate and the whole degree ofcrystallinity of PA66without crystal transition, resulting from the reduced α and γcrystal structure of PA66. The isothermal crystallization kinetics analysis suggestedthat the isothermal crystallization behavior of all hybrids was suitable to Avramiequation. The nucleating mechanism and the way of crystal growth were not alteredby TFP, wich had advantage on formatting crystal nucleus. At the same time, thehybrids were given priority to with heterogeneous nucleation, with low dependenceon the temperature. But pure PA66was given priority to homogeneous nucleationwith higher dependence on the temperature. Additionally, the variable morphology,the two kinds of size distribution of TFP particles in nylon66matrix and the favorable compatibility between phases were also shown.In TFP/LDPE hybrids the increasing TFP could highlight its characteristic peakin hybrid. However, there was on new building interaction between TFP and C=O ofmaleic anhydride. It coud be found that maleic anhydride eliminated theheterogeneous nucleation of TFP for LDPE. Meantime, we found that thecrystallization degree of LDPE and LDPE-g-MAH were reduced by the increasingTFP. But the effect of TFP content on the crystallization degree of LDPE-g-MAH wasmore obvious than that of LDPE. TFP could be uniformly distributed inLDPE-g-MAH without agglomerate, and there were favourable compatibility betweenTFP and LDPE-g-MAH.