A novel eco-friendly halogen-free cardanol-based flame retardant with P, Si, and N on the chain backbone (PSNCFR) was synthesized and incorporated into phenolic foams (PFs). PSNCFR was comprehensively investigated via Fourier transform infrared spectroscopy and nuclear magnetic resonance. PSNCFR endowed PFs with flame retardancy, contributed to generating a composite char defense against flames, and efficiently prevented smoking from PFs. PSNCFR introduction improved the flexural strength of the PFs to approximately 155% of that of pristine PF. PSNCFR-modified PFs displayed a high limiting oxygen index value of 41.9%. The results of cone calorimeter show that the mean heat release rate, mean effective heat of combustion, and total heat release of the PSNCFRmodified PFs reduced by 26.92%, 35.71%, and 31.25%, respectively. In particular, the total smoke production of the PSNCFR-modified PFs decreased by 64.55%, indicating excellent smoke inhibition. As for the mechanism, the condensation and gas phases during pyrolysis were responsible for the synergistic flame retardancy in the modified PFs. The findings demonstrate that PSNCFR can be used in PF preparation to overcome their drawbacks of internal brittleness and flammability.
BackgroundRejuvenation of aging eyelids is one of cosmetic changes to the individual to create the appearance of youth. Tightening treatment of eyelid by ultrasonic heat could possibly develop acute eye injury, including acute increase of IOP, cataract and rarely myopia.Case presentationA case report of rejuvenation tightening treatment caused eye injury with 6 months’ follow-up. All examinations were performed at a university teaching hospital. A healthy 32-year-old Asian woman had pain, photophobia and blurred vision in the right eye after rejuvenation tightening eye brow treatment. Intraocular pressure (IOP) was 31 mmHg in the right eye. Tyndall phenomena were observed. Visual acuity of the right eye dropped to 20/200 (from 20/20), with best-corrected visual acuities (BCVAs) 20/20. An iris pigment detachment was found. Neuro-ophthalmic examination was relative afferent pupillary defect (RAPD) positive with pericentral scotoma in the right eye, indicating optic nerve damage. In the optical quality analysis system (OQAS) exam, the objective scatter index (OSI) was 1.0 in the right eye and 0.7 in the left. Clearing additional plus lens power was difficult for this patient, indicating accommodation spasm in the right eye.ConclusionsRejuvenation with intense-focused ultrasound (IFUS) could cause heat injury, leads to acute increase of IOP. Heat damage in zonular fibers could cause accommodation spasm and myopia. Eye injuries caused by IFUS has been seldom reported. We recommend that cosmetic treatment in the eye area should be highly aware of side effect.Electronic supplementary materialThe online version of this article (10.1186/s12886-018-0891-2) contains supplementary material, which is available to authorized users.
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