环保增塑剂TXIB的合成以及其对聚乳酸材料的改性研究

Synthesis of environmental friendly plasticizer TXIB and its modification of polylactic acid

以异丁酸和2,2,4-三甲基-1,3-戊二醇(TMPD)为原料,以对甲苯磺酸为催化剂,常压反应5 h(温度由150℃逐渐升温至195℃),减压反应1.5 h,真空度为-0.095 MPa,制备得到增塑剂TXIB。采用红外光谱(FT-IR)和核磁共振谱(~1H-NMR)对其进行表征;将该增塑剂与聚乳酸(PLA)按一定的质量比例共混后成膜,采用差示扫描量热仪(DSC)、动态热机械分析仪(DMA)和万能材料强力机对不同含量的增塑剂TXIB对PLA/TXIB共混膜的性能影响进行研究。结果表明:随着增塑剂含量的增加,PLA/TXIB共混体系的玻璃化温度(T_g)逐步降低,储能模量(E′)逐渐减小,拉伸强度由88.5 MPa下降至37.9 MPa,断裂伸长率由47.6%增至418.5%。

The plasticizer TXIB is prepared by using isoamyl acetate and TMPD as raw materials, p-toluene sulfonic acid as catalyst, with 5 h of atmospheric pressure reaction （temperature increased from 150℃ to 195℃）, 1.5 h of decompression reaction, -0.095 MPa of vacuum degree. The samples are characterized by infrared spectroscopy （FT-IR） and nuclear magnetic resonance spectroscopy （1H-NMR）; the plasticizer is blended with PLA in a certain mass ratio to form a flm. The effects of different amount of plasticizer TXIB on the properties of PLA/TXIB blend flm are studied by differential scanning calorimetry （DSC）, dynamic mechanical analyzer （DMA） and universal material strength machine. The results show that with the increase of plasticizer content, the glass transition temperature （Tg） of PLA/TXIB blends decreases gradually, the energy storage modulus （E＇） decreases gradually, the tensile strength decreases from 88.5 MPa to 37.9 MPa, and the elongation at break increases from 47.6% to 418.5%.