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A nano-sized silica supported Cp 2 ZrCl 2 /MAO catalyst was used to catalyze the copolymerization of ethylene/1-hexene and ethylene/1-octene to produce linear low-density polyethylene (LLDPE) in a batch reactor. Under identical reaction conditions, the nano-sized catalyst exhibited significantly...
The synthesis and characterization of a thermosensitive chitosan (CS)/poly(vinyl alcohol) (PVA) hydrogel containing nanoparticles with different charges for drug delivery were reported. Through the electrostatic effect of –N + (CH 3 ) 3 and –COO − , the nanoparticles of N -(2-hydroxyl)...
Thermal stability of isotactic polypropylene with or without calcium carbonate nanoparticles (nCaCO 3 ) was investigated by chemiluminescence under isothermal regime at 190 °C. Two kinds of nCaCO 3 particles, i.e., (neat and stearic acid-coated ones) were used. The contents of nCaCO 3 within the...
In the present study, thermal degradation of polyolefins (PP and LDPE) and PET in a tubular reactor in an inert atmosphere was conducted. Each polymer was subjected to pyrolysis at the temperatures of 673, 773, 873, and 973 K. Yields of tar, residual coke and gas, and conversion degrees were...
Three dimensional real-space self-consistent field theory is employed to study the effect of conformational asymmetry on the self-assembly of amphiphilic diblock copolymer in selective solvent. The phase diagrams in wide ranges of interaction parameters and conformational asymmetry were obtained...
The grafting polymerization of maleic anhydride (MAH) and styrene (St) onto PP was carried out in suspension phase. Infrared (IR) spectra and 1 H-NMR spectra confirmed that MAH and St were successfully grafted onto the PP backbone. The influences, such as monomers concentration, reaction...
The different kinds of collagen–Zn complexes were prepared by zinc acetate, zinc chloride, zinc nitrate, and zinc sulfate reacted with collagen protein. Their antibacterial activities have been investigated by MIC method. It was found that the antibacterial activity of collagen–ZnSO 4 complex...
Simultaneous glycolysis and neutral hydrolysis of waste PET flakes obtained from grinding post-consumer bottles was carried out in the presence of xylene and an emulsifier at 170 °C. The product was separated from ethylene glycol (EG), water, and xylene by filtration, and was extracted by water...
Novel hyperbranched molecules containing pyrrole units were obtained from ortho -, meta -, and para -diaminodiphenyldiacetylenes, as AB 2 type monomers by one-step polymerization. Diacetylenic fragments reacted with terminal amino groups in the presence of copper chloride to give pyrrole units....
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