SMA共聚物玻璃化转变温度测定条件的优化

本文利用差示扫描量热法（DSC）研究了气氛、升温速率、试样量和载气流速对苯乙烯-马来酸酐共聚物（SMA）玻璃化转变温度的影响，并用优化后的条件考察了上海石油化工研究院自制SMA样品的玻璃化转变温度。实验结果表明，在试样量10 mg左右、氮气流速40 mL/min、升温速率20 ℃/min的优化条件下，测定结果良好，经验证，DSC与动态机械热分析(DMTA)所测得的Tg基本一致，表明优化后的条件很适合SMA玻璃化转变温度的测定，此结果有助于SMA的生产和应用。

Optimal Analytical Procedure for Measuring Glass Transition Temperature of Styrene-Maleic Anhydride Copolymer

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 indicate 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.