Mai Tran Thi, Chinh Nguyen Thuy, Baskaran Rajesh, Trang Nguyen Thi Thu, Thang Vu Viet, Le Dang Thi Thanh, Minh Do Quang, Hoang Thai
Institute for Tropical Technology, Vietnam Academy of Science and Technology, No. 18, Hoang Quoc Viet Str., Cau Giay Dist., Ha Noi, 100000, Vietnam.
Future Industries Institute, University of South Australia, Mawson Lakes 5095, South Australia, Australia.
J Nanosci Nanotechnol. 2018 Jul 1;18(7):4963-4970. doi: 10.1166/jnn.2018.15352.
This paper presents the tensile, thermal, dielectric and morphological properties of composites based on polyoxymethylene (POM) and nanosilica (NS) prepared by melt mixing method at 190 °C. Based on the torque readings, the processing of POM/NS composites were found to be easier in comparison to only POM. The FT-IR spectra analysis of the POM/NS nanocomposites showed the presence of peak at approximately 910 cm-1, attributed to the Si-O and C-O groups in NS and POM on the POM/NS nanocomposite. The absorption at these peaks increased on gradually increasing the content of NS. Tensile property testing (tensile strength, elongation at break, and Young's modulus) indicated that the tensile strength of POM/NS nanocomposites increases as the NS content increases from 0.5 wt.% to 1.5 wt.%, and sharply dropped when the NS content was more than 2 wt.%. A similar trend was observed for Young's modulus and elongation at break of the nanocomposites. The DSC analysis of the nanocomposites showed that the melting temperature (Tm) of POM/NC composites increased in the presence of low weight % of NS which can be attributed to the interaction between POM and NS leading to the rising crystallinity of all nanocomposites. POM/NS have a slightly higher temperature resistance as confirmed from the TGA analysis and POM/NS 1.5 wt.% had the maximum degradation temperature (Tmax) value and consequently the lowest weight loss. The dielectric constant of the nanocomposites increased from 3.26 to 3.56, while the dielectric loss tangent and volume resistivity were dropped, corresponding to the NS content from 0.5 to 2 wt.%. The SEM images of POM/NS nanocomposites demonstrated that the NS particles were dispersed relatively regularly into POM with a size in the range of 100 to 500 nm. They were dispersed more regularly into the polymer matrix at 1.5 wt.% NS. Based on the obtained results, the suitable NS content for the preparation of the POM/NS nanocomposites was found to be 1.5 wt.%.
本文介绍了通过在190℃下熔融共混法制备的基于聚甲醛（POM）和纳米二氧化硅（NS）的复合材料的拉伸、热、介电和形态学性能。基于扭矩读数，发现与仅POM相比，POM/NS复合材料的加工更容易。POM/NS纳米复合材料的傅里叶变换红外光谱（FT-IR）分析显示在约910 cm-1处存在峰，这归因于POM/NS纳米复合材料中NS和POM中的Si-O和C-O基团。随着NS含量的逐渐增加，这些峰处的吸收增加。拉伸性能测试（拉伸强度、断裂伸长率和杨氏模量）表明，当NS含量从0.5 wt.%增加到1.5 wt.%时，POM/NS纳米复合材料的拉伸强度增加，而当NS含量超过2 wt.%时急剧下降。纳米复合材料的杨氏模量和断裂伸长率也观察到类似趋势。纳米复合材料的差示扫描量热法（DSC）分析表明，在低重量百分比的NS存在下，POM/NC复合材料的熔点（Tm）升高，这可归因于POM和NS之间的相互作用导致所有纳米复合材料的结晶度提高。热重分析（TGA）证实POM/NS具有略高的耐热性，并且POM/NS 1.5 wt.%具有最高的降解温度（Tmax）值，因此重量损失最低。纳米复合材料的介电常数从3.26增加到3.56，而介电损耗角正切和体积电阻率下降，对应于NS含量从0.5到2 wt.%。POM/NS纳米复合材料的扫描电子显微镜（SEM）图像表明，NS颗粒相对规则地分散在POM中，尺寸范围为100至500 nm。在NS含量为1.5 wt.%时，它们更规则地分散在聚合物基体中。基于获得的结果，发现制备POM/NS纳米复合材料的合适NS含量为1.5 wt.%。
