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首页> 外文期刊>Polymers for advanced technologies >Surface properties of hydrosilylated polyolefins annealed in supercritical carbon dioxide
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Surface properties of hydrosilylated polyolefins annealed in supercritical carbon dioxide

机译：超临界二氧化碳中退火的氢化硅烷化聚烯烃的表面性能

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Two hydrosilylated polyolefin compounds are obtained by reacting polypropylene (PP) and polyethylene (PE) with di- and multi-functional hydride-terminated poly(dimethylsiloxane) (dH-PDMS and mH-PDMS), respectively. The PDMS-rich surface layers on these two samples show different Si concentrations but similar thicknesses. Samples of these materials are annealed in supercritical carbon dioxide (scCO{sub}2) at various temperatures and pressures for different periods of time. On the PP/dH-PDMS sample, an increase in the annealing temperature does not affect the Si concentration up to 120℃. However, the Si concentration is sharply reduced at T=150℃ at which point the surface appears to be covered by SiO{sub}2 particles. Annealing the PP/dH-PDMS sample for short times leads to submicron scale SiO{sub}2 particle formation on the surface. The particles form aggregated clusters that spread all over the surface uniformly when the annealing time is extended. However, Si concentration on the PE/mH-PDMS sample surface is enhanced as the annealing temperature increases, reaching a maximum at an annealing temperature of 100℃. No particle formation is observed on the PE/mH-PDMS sample surface. The contact angle of both samples is found to increase with annealing temperature. Increasing the scCO{sub}2 pressure leads to a higher Si concentration on the surfaces of both samples. On the other hand, increasing the CO{sub}2 pressure leads to opposite trends in contact angle with the PP/dH-PDMS sample exhibiting an increasing contact angle and the PE/mH-PDMS sample exhibiting a decreasing one.
机译：通过使聚丙烯（PP）和聚乙烯（PE）分别与二官能和多功能氢化物封端的聚（二甲基硅氧烷）（dH-PDMS和mH-PDMS）反应，可以得到两种氢化硅烷化的聚烯烃化合物。这两个样品上富含PDMS的表面层显示出不同的Si浓度，但厚度相似。将这些材料的样品在超临界二氧化碳（scCO {sub} 2）中于不同温度和压力下退火不同时间。在PP / dH-PDMS样品上，退火温度的升高不会影响高达120℃的Si浓度。然而，在T = 150℃时，Si浓度急剧降低，此时表面似乎被SiO {sub} 2颗粒覆盖。对PP / dH-PDMS样品进行短时间退火会导致在表面形成亚微米级的SiO {sub} 2颗粒。当延长退火时间时，颗粒形成聚集的团簇，这些团簇均匀地分布在整个表面上。但是，随着退火温度的升高，PE / mH-PDMS样品表面的Si浓度会增加，在100℃的退火温度下达到最高。在PE / mH-PDMS样品表面未观察到颗粒形成。发现两个样品的接触角均随着退火温度的增加而增加。 scCO {sub} 2压力的增加导致两个样品表面上的Si浓度更高。另一方面，增加CO {sub} 2压力会导致相反的接触角趋势，PP / dH-PDMS样品的接触角增大，而PE / mH-PDMS样品的接触角减小。

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