Li Lingtong, Guo Xincheng, Chen Shaopeng, Chen Xiaolang, Qin Jun, Lu Zongcheng
Key Laboratory of Advanced Materials Technology Ministry of Education, School of Materials Science and Engineering, Southwest Jiaotong University, Chengdu 610031, China.
Sichuan Jiahe Copoly Technology Co., Ltd., Chengdu 610015, China.
Soft Matter. 2021 Nov 17;17(44):10149-10159. doi: 10.1039/d1sm01123e.
The co-precipitation method is used to fabricate layered double hydroxide (LDH) nanohybrids with surface engineering of graphene oxide (GO) by radially grafting borate-LDH (BLDH) to BLDH@GO nanosheets, aiming at improving the surface characteristics and compatibility of LDH with the polymer matrix. The results prove the successful fabrication of BLDH@GO and LDH@GO nanosheets. The nanosheets are mixed into polypropylene (PP) by melt blending to study the structure and properties of the composites. The PP composites with BLDH@GO and BLDH have both exfoliation structures and aggregation structures, and the two nanosheets show enhanced interfacial interactions with the PP matrix compared with LDH and LDH@GO. The initial decomposition temperatures of the PP composites are lower than those of the neat PP, but the thermal degradation temperatures of the PP composites are higher. Compared with the other samples, BLDH@GO provides a higher nucleation density, reflected in a smaller spherulite size and a higher crystallization temperature confirmed by the differential scanning calorimetry (DSC) results. BLDH@GO shifts the crystallization temperature of PP to higher values (compared to the neat PP) due to the nucleation effect, which is in line with the increase in the nucleation density detected by polarized optical microscopy (POM).
采用共沉淀法制备了层状双氢氧化物（LDH）纳米杂化物，通过将硼酸盐-LDH（BLDH）径向接枝到BLDH@GO纳米片上对氧化石墨烯（GO）进行表面工程处理，旨在改善LDH与聚合物基体的表面特性和相容性。结果证明成功制备了BLDH@GO和LDH@GO纳米片。将纳米片通过熔融共混混入聚丙烯（PP）中，以研究复合材料的结构和性能。含BLDH@GO和BLDH的PP复合材料同时具有剥离结构和聚集结构，与LDH和LDH@GO相比，这两种纳米片与PP基体之间的界面相互作用增强。PP复合材料的初始分解温度低于纯PP，但PP复合材料的热降解温度更高。与其他样品相比，BLDH@GO提供了更高的成核密度，差示扫描量热法（DSC）结果证实其表现为更小的球晶尺寸和更高的结晶温度。由于成核效应，BLDH@GO将PP的结晶温度提高到更高值（与纯PP相比），这与偏光显微镜（POM）检测到的成核密度增加一致。
