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Utilization of porous liquids for catalytic conversion

Yewei Ren, Guosheng Zhou, Ziyang Lu*
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Incorporating organic-modified nano SiO2 for the comprehensive improvement of recycled PET

Lina Song, Nan Zhou, Feng Gao, Huawen Wang, Haifeng Wang, Chunyi Hu, Weiqiang Xiao*, Dangguo Cheng, Qinghua Zhang, Quan Liu*

Chin. J. Struct. Chem., 2023, 42: 100042. DOI: 10.1016/j.cjsc.2023.100042

April 15, 2023

ABSTRACT

Nano-SiO2 with epoxy functional groups was synthesized by a two-step method. SiO2/rPET nanocomposites were prepared by melt blending modified SiO2 with recycled PET. The modified SiO2, as a heterogeneous nucleation center, promoted the crystallization of polyester; the epoxy groups provided by the organic layer on the inorganic particles were cross-linked with the polyester, which increased the complex viscosity of the recycled PET; also acted as a stress concentration point. Organic layer increased the compatibility of polymers and inorganic particles, and reduced the interaction between inorganic particles. As a result, the nanocomposites reached a balance of rigidity and toughness. The properties of nanocomposites were related to the dispersion of SiO2. Under experimental conditions, the optimal content of SiO2 was 1 wt%. The nanoparticles did not agglomerate, and the crystallinity reached 27.45%, which was an increase of 28%; tensile strength and Izod impact strength were 37.13 MPa and 1.60 kJ m-2, which were increased by 80% and 100%, respectively.






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