Performance of oxidation resistant coatings for C/C composites as aircraft brakes

Preparation and property of waterborne UV‐curable chain‐extended polyurethane surface sizing agent: Strengthening and waterproofing mechanism for cellulose fiber paper

“…In the process of photo-polymerization, the photoinitiator content determines the curing degree of the polymer. 36 As shown in Figure 4, the gel content greatly increases when the Chemcure-73W content increases from 1% to 3%. It can be ascribed to the UV-curable velocity, which is depended on the forming velocity of free radicals on the film surface.…”

“…On one hand, owing to the enhanced intermolecular interactions with increasing DMBA content, the molecular motion is restricted, and the molecular movement inside the film is hindered after the film surface is cured so that the curing degree is reduced, 36 resulting in decreased gel content and water resistance. On the other hand, the great increase in the DMBA content promotes the formation of more hydrophilic microdomains, leading to an abrupt decrease in gel content and water resistance.…”

“…The excessive photoinitiator closed to the film surface will absorb most of the UV light, and the light flux reached to the film interior would decrease sharply. 19,36 The number of free radicals generated by the photoinitiator thereby decreases, as well as the UV-curable velocity. Therefore, the gel content decreases when the content of Chemcure-73W is 5%.…”

“…It can be ascribed to the UV-curable velocity, which is depended on the forming velocity of free radicals on the film surface. 19,36 According to the Larbert-Beer law, the light intensity is degressive in the form of an exponential function when the content of photoinitiator increases.…”