A Characteristic Study of Polylactic Acid/Organic Modified Montmorillonite (PLA/OMMT) Nanocomposite Materials after Hydrolyzing

Crystals

Su-Mei Huang¹  Jiunn-Jer Hwang¹  An-Miao Zheng²  Hsin-Jiant Liu² 

[1] Department of Chemical Engineering, Army Academy, Taoyuan City 32092, Taiwan;Department of Chemical and Materials Engineering, Vanung University, Taoyuan City 32061, Taiwan;

关键词: montmorillonite;    polylactic acid;    nanocomposite materials;    hydrolysis;   

DOI  :  10.3390/cryst11040376

来源: DOAJ

【 摘 要 】

In this study, the montmorillonite (MMT) clay was modified with NH₄Cl, and then the structures were exfoliated or intercalated in a polylactic acid (PLA) matrix by a torque rheometer in the ratio of 0.5, 3.0, 5.0 and 8.0 wt%. X-ray diffraction (XRD) revealed that the organic modified-MMT(OMMT) was distributed successfully in the PLA matrix. After thermal pressing, the thermal stability of the mixed composites was measured by a TGA. The mixed composites were also blended with OMMT by a co-rotating twin screw extruder palletizing system, and then injected for the ASTM-D638 standard specimen by an injection machine for measuring the material strength by MTS. The experimental results showed that the mixture of organophilic clay and PLA would enhance the thermal stability. In the PLA mixed with 3 wt% OMMT nanocomposite, the TGA maximum decomposition temperature (T_max) rose from 336.84 °C to 339.08 °C. In the PLA mixed with 5 wt% OMMT nanocomposite, the loss of temperature rose from 325.14 °C to 326.48 °C. In addition, the elongation rate increased from 4.46% to 10.19% with the maximum loading of 58 MPa. After the vibrating hydrolysis process, the PLA/OMMT nanocomposite was degraded through the measurement of differential scanning calorimetry (DSC) and its T_g, T_c, and T_m1 declined.

【 授权许可】

Unknown