Span80

1-(2-aminoethyl)piperazine (AEPZ, Aldrich), N,N'-bis(acryloyl)cystamine (BAC, Fluka), poly(ethylene glycol) methyl ether (Mn: 750, Aldrich), span80 (J&K) and tween80 (J&K) were purchased and used without further purification. α-Amino-ω-methoxy-poly(ethylene glycol) was prepared from poly(ethylene glycol) methyl ether according to literature [17] . L-lactide and glycolide were purchased from PURAC (the Netherlands) and purified by recrystallization in ethyl acetate (Beijing Tonghua fine chemicals company) twice. Poly(lactic-co-glycolic acid) (PLGA) was prepared by ring-opening polymerization of L-lactide and glycolide under 65 Pa in sealed glass ampoules at 180 °C for 20 h in the presence of stannous octoate as catalyst (0.05 wt%). The raw PLGA (50/50) (85,000) (Molecular weights were determined by GPCmax VE-2001 gel-permeation chromatography) was purified by dissolving in chloroform and re-precipitation from ethanol, followed by drying in vacuum at room temperature for 48 h. The 1,4-dioxane and other reagents were obtained from Beijing Chemical Reagents Company, China and directly used without further treatment. The 1,4-dioxane used in here was not chromatographically pure. All other chemicals were purchased from Sigma-Aldrich.

Dicyclopentadiene was provided by TCI (Shanghai) Chemical Industry Development Co., Ltd. for the synthesis of polydicyclopentadiene. The first generation Grubbs catalyst was purchased from Saen Chemical Technology (Shanghai) Co., Ltd. The toluene and acetone were obtained from Jiangsu Yonghua Fine Chemicals Co., Ltd. and China National Chemicals Co., Ltd., respectively. Emulsifier, Span80, was supplied by J&K Scientific Ltd. Asphalene stabilizer, SNODMI (poly(styrene-alt-octadecyl maleimide)), was synthesized in our laboratory.^{41 (link)}