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首页> 美国卫生研究院文献>Polymers >Flame Retardant Submicron Particles via Surfactant-Free RAFT Emulsion Polymerization of Styrene Derivatives Containing Phosphorous
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Flame Retardant Submicron Particles via Surfactant-Free RAFT Emulsion Polymerization of Styrene Derivatives Containing Phosphorous

机译：通过不含表面活性剂的RAFT乳液聚合含磷苯乙烯衍生物的阻燃剂亚微米颗粒

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The reversible addition–fragmentation chain transfer (RAFT) emulsion polymerization of diethyl-(4-vinylbenzyl) phosphate (DEVBP) was performed using PEG-TTC as a macro RAFT agent. PEG-TTC (M 2000, 4000) was synthesized by the esterification of poly (ethylene glycol) methyl ether with a carboxylic-terminated RAFT agent, composed a hydrophilic poly (ethylene glycol) (PEG) block and a hydrophobic dodecyl chain. The RAFT emulsion polymerization of DEVBP was well–controlled with a narrow molecular size distribution. Dynamic light scattering and confocal laser scanning microscopy were used to examine the PEG-b-PDVBP submicron particles, and the length of the PEG chain (hydrophilic block) was found to affect the particle size distribution and molecular weight distribution. The submicron particle size increased with increasing degree of polymerization (35, 65, and 130), and precipitation was observed at a high degree of polymerization (DP) using low molecular weight PEG-TTC (DP 130, A3). The flame retardant properties of the PEG-b-PDVBP were evaluated by thermogravimetric analysis (TGA) and micro cone calorimeter (MCC). In the combustion process, the residue of PEG-b-PDEVBP were above 500 °C was observed (A1 ~ B3, 27 ~ 38%), and flame retardant effect of PEG-b-PDEVBP submicron particles/PVA composite were confirmed by increasing range of temperature and decreasing total heat release with increasing contents of PEG-b-PDEVBP. The PEG-b-PDEVBP submicron particles can provide flame retardant properties to aqueous, dispersion and emulsion formed organic/polymer products.
机译：磷酸二乙酯-（4-乙烯基苄基）酯（DEVBP）的可逆加成-断裂链转移（RAFT）乳液聚合是使用PEG-TTC作为大分子RAFT试剂进行的。 PEG-TTC（M 2000，4000）是通过聚（乙二醇）甲醚与羧基封端的RAFT剂的酯化反应合成的，它由亲水性的聚（乙二醇）（PEG）嵌段和疏水的十二烷基链组成。 DEVBP的RAFT乳液聚合受到良好控制，分子大小分布窄。使用动态光散射和共聚焦激光扫描显微镜检查PEG-b-PDVBP亚微米颗粒，发现PEG链（亲水嵌段）的长度会影响粒径分布和分子量分布。亚微米粒度随着聚合度（35、65和130）的增加而增加，并且使用低分子量PEG-TTC（DP 130，A3）在高聚合度（DP）上观察到沉淀。 PEG-b-PDVBP的阻燃性能通过热重分析（TGA）和微锥量热仪（MCC）进行了评估。在燃烧过程中，观察到PEG-b-PDEVBP亚微米颗粒/ PVA复合材料的阻燃效果在500°C以上（A1〜B3，27％〜38％），并证实了其阻燃作用。随着PEG-b-PDEVBP含量的增加，温度范围减小，总热量释放减少。 PEG-b-PDEVBP亚微米颗粒可为水性，分散体和乳液形成的有机/聚合物产品提供阻燃性能。

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