Abstract:Abstract: Styrene-maleic anhydride (SMA) copolymer is a commercially heat resistant materials and compatibilizer bearing reactive anhydride groups. The effects of atmosphere, heating rate, sample mass and flow rate of carrier gas on glass transition temperature of SMA were also investigated by differential scanning calorimetry (DSC). N2 is preferred as the carrier gas. Moderate carrier gas flow rate, heating rate and sample mass help to obtain relatively accurate results. The results indicated that Tg of SMA was measured preferably with the sample mass of about 10 mg, N2 flow rate of 40 mL/min and heating rate of 20 ℃/min, which is proved appropriate by dynamic mechanical thermal analysis.