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Herein, acid-degradable poly(ortho ester urethanes) (POEUs) were synthesized via polycondensation between an acid-labile ortho ester diamine and active esters of poly(ε-caprolactone) (PCL) diols with different molecular weights. The POEUs nanoparticles were easily fabricated using an oil-in-water emulsion technique, whose ortho ester bonds in main-chains could be degraded at different rate in acidic...
PEGylated poly(ortho ester amides) copolymer micelles (POEAd-g-MPEG micelles) with ultra-pH-sensitivity, which exhibited a dynamic change in size under mildly acidic conditions, were constructed by facile method, therefore achieving: (i) remaining stealthy and long-circulating in the blood; (ii) small NPs once in the tumor extracellular space for enhancing penetration; (iii) bigger NPs after penetration...
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