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首页> 外文期刊>RSC Advances >Preparation and properties of long chain branched high-density polyethylene based on nano-SiO2 grafted glycidyl methacrylate
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Preparation and properties of long chain branched high-density polyethylene based on nano-SiO2 grafted glycidyl methacrylate

机译：纳米SiO2接枝甲基丙烯酸缩水甘油酯的长支链高密度聚乙烯的制备及性能

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摘要

A compounded nanoparticle with multiple double bonds (CC) was prepared by grafting glycidyl methacrylate (GMA) onto the surface of nano-SiO _(2) . Then gel-free long chain branched polyethylene (LCBPE) was prepared by melt branching reaction in a Haake torque rheometer in the presence of initiator peroxide and GMA grafted nano-SiO _(2) (SiO _(2) - g -GMA). The sampling time corresponded to the summit of the reaction peak in the torque curve. Fourier transform infrared results indicated that SiO _(2) - g -GMA had been grafted onto the HDPE backbone via radical reaction. The reaction mechanism and the topological structure of the PE products are also discussed. Rheological results showed that the relaxation time and molecular weight distribution of modified PE were increased owing to the introduction of LCB structure, and the more SiO _(2) - g -GMA was added, the more apparent variation could be observed. Compared with linear HDPE, both the melt strength and mechanical properties of LCBPE were improved obviously. From the differential scanning calorimetry and polarized optical microscopy results, smaller crystal size and lower growth rate were observed compared with linear HDPE, which are ascribed to the nucleation and restriction of long branching chains in the system. Well distributed nano-SiO _(2) without any agglomeration in the PE matrix was observed in the scanning electron microscope images when the SiO _(2) - g -GMA content was less than 3 phr.
机译：通过将甲基丙烯酸缩水甘油酯（GMA）接枝到纳米SiO_（2）的表面上，制备了具有多个双键（CC）的复合纳米颗粒。然后在引发剂过氧化物和GMA接枝的纳米SiO_（2）（SiO_（2）-g -GMA）的存在下，通过在Haake扭矩流变仪中进行熔融支化反应，制备了无凝胶长链支化聚乙烯（LCBPE）。采样时间对应于扭矩曲线中反应峰的峰值。傅里叶变换红外结果表明，SiO_（2）-g-GMA已通过自由基反应接枝到HDPE骨架上。还讨论了PE产物的反应机理和拓扑结构。流变学结果表明，由于LCB结构的引入，改性PE的弛豫时间和分子量分布增加，且SiO_（2）-g-GMA的添加量越多，观察到的变化越明显。与线性HDPE相比，LCBPE的熔体强度和力学性能均有明显提高。从差示扫描量热法和偏振光学显微镜结果，与线性HDPE相比，观察到较小的晶体尺寸和较低的生长速率，这归因于系统中长支链的成核和限制。当SiO _（2）-g -GMA含量小于3 phr时，在扫描电子显微镜图像中观察到分布均匀的纳米SiO _（2）在PE基质中没有任何团聚。

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