PET bottlesare often used as airtight containers for filling carbonated drinks. Because carbonated drinks contain large volumes of CO2 gas, the container needs to bear a tremendous pressure from the inside of the bottle.If the stress exceeds the bearing limit, the material will show the phenomenon of local cracking and liquid overflow.For the structural design, the method of manual adjustment before automatic adjustment was adopted. First, through manual optimization, the initial optimal parameter combination was as follows:the inner diameter of the bottle bottom was 17 mm, the dip angle of the valley bottom was 81°, the deepest part of the valley bottom was 25 mm, and the outer diameter was 27 mm. Comsol software was used for automatic optimization. Compared with the original bottle bottom, the total maximum principal stress and total elastic strain energy in the bottle bottom after manual–automatic double optimization decreased by 69.4% and 40.0%, respectively, and the displacement caused by deformation decreased by 0.60 mm (74.1%). The extremely high reduction ratio was caused by manual–automatic double optimization.
This study presents a composite phase change material (CPCM) that uses emulsion polymerization to prepare crosslinked poly(N-hydroxymethyl acrylamide) (PN-MA)/polyethylene glycol (PEG) interpenetrating polymer network (IPN) eutectic microspheres. X-ray diffractogram shows that even after adding PN-MA for cross-linking, the PEG eutectic still exhibited crystallization ability. Differential scanning calorimetry shows that the CPCM melted at 31.58 °C with 94.61 J/g and solidified at 38.02 °C with 88.63 J/g. Thermogravimetric analysis suggested that the CPCM can be applied to thermal energy storage. After 25 thermal cycles, there was a change in the macrostructure of the CPCM and the latent heat of phase change. Scanning electron microscopy results shows that the CPCM is a kind of microsphere with uniform particle size distribution. The CPCM is expected to be used in fields such as smart textiles, thermal insulation materials, and industrial waste heat utilization.
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