私密直播全婐app免费大渔直播,国产av成人无码免费视频,男女同房做爰全过程高潮,国产精品自产拍在线观看

當前位置:> 首頁 > 論文著作 > 正文
Synthesis of zinc phosphonated poly(ethylene imine) and its fire retardant effect in low density polyethylene
作者:Zhang Y, Li XN, Cao ZH, Fang ZP*, Hull TR*, Stec A
關鍵字:Zinc chelate; Low density polyethylene; Fire retardant; Mannich condensation; Flammability
論文來源:期刊
具體來源:Ind. Eng. Chem. Res., 2015.4, 54(13): 3247-3256
發表時間:2015年
A novel oligomeric intumescent fire retardant chelate, zinc phosphonated poly(ethylene imine) (Zn-PEIP), with a changeable Zn2+ loading, was synthesized. The chemical structure of Zn-PEIP was confirmed by FTIR, 13C NMR and 31P NMR spectra. The thermal behavior and fire retardancy of low density polyethylene (LDPE) containing 25 wt% Zn-PEIPs with different amounts of Zn2+ were investigated by thermogravimetric analysis (TGA), limiting oxygen index (LOI) and cone calorimetry. The TGA results showed that higher concentrations of Zn2+ improved the thermal stability and increased the residue yield of LDPE. However, the data from the LOI and cone calorimetry showed that there is an optimum concentration of Zn2+ for the best fire retardant performance of LDPE. This is ascribed to the high crosslink density resulting from zinc bridges, preventing normal swelling of the intumescent system. The surface morphology of the char was characterized by digital photographs and scanning electron microscopy (SEM). This confirmed the optimum intumescence, coherent and strong barrier layer formation at an intermediate Zn2+ loading.
主站蜘蛛池模板: 黑龙江省| 遵义市| 疏勒县| 博乐市| 松滋市| 吴川市| 台前县| 武川县| 新竹市| 鲁山县| 闽侯县| 历史| 威海市| 凯里市| 临高县| 泰和县| 秀山| 萝北县| 郸城县| 五河县| 浦东新区| 新河县| 聂拉木县| 江源县| 庆元县| 安丘市| 襄汾县| 西乌珠穆沁旗| 太和县| 馆陶县| 延津县| 象山县| 栖霞市| 西昌市| 秦安县| 义乌市| 如皋市| 闵行区| 乐清市| 新和县| 唐河县|