This　study　proposes　utilizing　thermosensitive　surfactants,　referred　to　as　“environmentally　responsive　surfactants,　”　as　emulsifiers　for　addressing　the　complexity　of　demulsification　and　separation　processes　after　emulsion　polymerization　reactions.　A　series　of　polyethylene　glycol-poly(N-isopropylacrylamide)　(PEG-b-PNIPAM)　block　copolymers　with　various　degrees　of　polymerization　were　synthesized　via　atom　transfer　radical　polymerization　(ATRP).　The　PNIPAM　segments　within　the　copolymers　exhibit　thermosensitive　behavior,　possessing　a　lower　critical　solution　temperature　(LCST)　at　32　℃,　enabling　the　control　of　hydrogen　bond　formation　and　rupture　with　water　molecules　based　on　temperature　variations.　Consequently,　the　PEG-b-PNIPAM　block　copolymers　display　hydrophilic　properties　at　room　temperature　and　amphiphilic　properties　in　the　range　from　35　℃　to　80　℃.　Surface　tension　measurements　at　different　concentrations　confirmed　the　low　critical　micelle　concentration　(CMC)　of　the　PEG-PNIPAM　block　copolymers,　with　a　minimum　value　as　low　as　9.10×10-3　g/L.　Evaluations　of　particle　size　distribution　and　emulsification　performance　validated　its　applicability　as　an　emulsifier　in　emulsion　polymerization　within　the　aforementioned　temperature　range.　Microscopic　observations　of　latex　particles　corroborated　the　precise　occurrence　of　emulsion　polymerization,　displaying　a　relatively　uniform　particle　size　distribution　in　the　resulting　polymer.　Upon　completion　of　the　emulsion　polymerization　reaction,　the　need　for　additional　agents　such　as　demulsifiers　or　physical　methods　like　mechanical　stirring　was　obviated.　Merely　lowering　the　reaction　system　to　room　temperature　facilitated　demulsification,　yielding　the　desired　polymer　products.　Further,　rapid　demulsification　could　be　achieved　by　cooling　the　reaction　system　at　lower　temperatures　(3‒8　℃).　Utilizing　PEG-b-PNIPAM　block　copolymers　as　surfactants　allowed　the　temperature-controlled　emulsification　and　demulsification　processes,　significantly　streamlining　the　emulsion　polymerization　process,　reducing　costs,　and　enabling　environmentally　friendly　production　practices.　©　2024　Science　Press.　All　rights　reserved.