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(HMDI). For the PU/SiO 2

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Figure

Fig. 2. Infrared spectra of pristine PU at differentNCO/OH ratio
Fig. 4. Proposed polymer reaction mechanism of PU/SiO2 interaction
Fig. 6. Tensile strength of PU and PU/SiO2 with varyingNCO/OH ratio and silica loading

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