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《塑料》2015,(3)
对聚丙烯T30s接枝交联复合改性制备高熔体强度聚丙烯(HMSPP)进行了研究,分别由正交实验和曲面响应分析可知,BPO对乙烯基长链不饱和硅烷交联改性T30s粒料和粉体制备HMSPP熔体强度的影响最显著;在粒料反应中通过优化实验,得到的HMSPP熔体强度为19.9 c N;在粉体反应中,通过优化实验,得到的HMSPP熔体强度为21.1 c N。二乙烯基苯(DVB)作为助交联剂可有效提高HMSPP的熔体强度,St对PP链断裂抑制较明显。交联改性中聚丙烯WB130的加入可使改性制得的HMSPP熔体强度显著提高,当WB130加入量为40%时,熔体强度可达34 c N。 相似文献
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采用乙烯基不饱和硅烷接枝交联复合改性聚丙烯(PP)制备高熔体强度聚丙烯(HMSPP)。由正交试验可知,过氧化二苯甲酰对乙烯基长链不饱和硅烷交联改性PP制备的HMSPP熔体强度的影响最显著。通过优化实验得到的HMSPP熔体强度为19.9cN。二乙烯基苯(DVB)作为助交联剂可有效提高HMSPP的熔体强度,w(DVB)不宜超过1.0%。苯乙烯质量分数为1.0%时,对HMSPP链断裂抑制较明显。采用复合改性PP制备的HMSPP的断裂拉伸应变略有下降,熔体强度相比PP提高4.7倍,悬臂梁缺口冲击强度提高0.82倍。 相似文献
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高熔体强度聚丙烯的研制 总被引:1,自引:0,他引:1
用过氧化物引发聚丙烯(PP)交联制备高熔体强度聚丙烯(HMSPP),研究了过氧化物的用量、反应温度、螺杆转速对HMSPP性能的影响。得到的HMSPP比普通PP的熔体强度提高约3倍。用所研制的HMSPP进行发泡实验,制得泡孔结构较均匀且闭孔的发泡制品。 相似文献
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采用差示扫描量热法、傅里叶变换红外光谱、毛细管流变、熔体拉伸等方法,从结晶性、黏弹性及物理机械性能等方面对高熔体强度聚丙烯(HMSPP)树脂进行结构表征与性能分析。结果表明:HMSPP树脂具备较高的弯曲模量,同时具备优异的抗熔垂能力和更宽的加工温度;拉伸黏度随拉伸速率的增大而增大,呈现出HMSPP应变硬化这一明显行为,使得熔体在热成型过程中具有均匀变形的自我调节能力,从而克服普通聚丙烯在热成型加工中的严重熔垂问题;含有较长接枝链段的HMSPP树脂在刚性、熔体强度、结晶性能等方面均优于普通聚丙烯。 相似文献
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在同向双螺杆挤出机上,对聚丙烯(PP)进行硅烷交联,制得高熔体强度聚丙烯(HMSPP),然后制备高发泡倍率的PP制品。分析了改性剂用量对PP熔体流动速率、熔体黏度、熔体强度、凝胶含量、力学性能、热性能和发泡性能的影响。结果表明:自制HMSPP的熔体强度和熔体黏度分别是纯PP的5.01倍和1.52倍,力学性能和耐热性与纯PP相比均有较大提高,可用于成型高发泡倍率制品。 相似文献
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高熔体强度聚丙烯(HMSPP)是聚丙烯的一种重要改性产品,具有广泛的用途。本文综述了高熔体强度聚丙烯的性能特点、用途、制备方法,以及国内外研究和开发情况。 相似文献
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Propylene/1-butene copolymer powders were produced through bulk copolymerization of propylene with 1-butene in a 12 m3 polymerization reactor. High melt strength polypropylene (HMSPP) was synthesized by in situ heat induction melt reaction, in which pure propylene/1-butene copolymer powders without any additives were used as a basic resin and trimethylolpropane triacrylate (TMPTA) as a crosslinking agent. The structure and properties of the resultant HMSPP were characterized by means of various measurements. The content of TMPTA strongly influenced the melt strength and melt flow rate (MFR) of HMSPP. With increasing the content of TMPTA, the melt strength of HMSPP increased, and the MFR reduced. In addition, owing to the existence of crosslinking structure, thermal stability and tensile strength of HMSPP were improved compared with pristine propylene/1-butene copolymer. © 2012 Wiley Periodicals, Inc. J Appl Polym Sci, 2012 相似文献
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High melt strength polypropylene (HMSPP) was prepared by in situ heat induction reaction, in which pure polypropylene (PP) powders without any additives was used as basic resin, and low density polyethylene (LDPE) and trimethylolpropane triacrylate (TMPTA) were added as blending resin and as crosslinking agent, respectively. Microstructure of the obtained HMSPP (PP/LDPE/TMPTA blends) was characterized by FTIR, Wide‐angle X‐ray diffraction (WAXD), and testing of gel content. The effect of LDPE content on melt strength and melt flow rate of HMSPP were investigated. When the content of LDPE was 40 wt %, the melt strength of the HMSPP was above 16 CN, which was much higher than those of pure PP powder (2.6 CN) and PP/LDPE blends without TMPTA (6.1 CN). Moreover, thermal behavior and mechanical properties of the HMSPP were also investigated. The results showed that the thermal stability and impact strength of HMSPP were greatly improved. In addition, HMSPP possessed good processing performance and good foaming properties. The foams produced by HMSPP showed uniform, closed, and independent cells. © 2010 Wiley Periodicals, Inc. J Appl Polym Sci, 2010 相似文献
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Preparation and foamability of high melt strength polypropylene based on grafting vinyl polydimethylsiloxane and styrene 下载免费PDF全文
A novel strategy was developed by melt grafting reaction in the presence of macromonomer vinyl polydimethylsiloxane (VS) and comonomer styrene (St) for preparing high melt strength polypropylene (HMSPP), and the rheological behavior, melt strength, and foaming ability of HMSPP were investigated. The results showed that VS and St were successfully grafted onto isotactic polypropylene (iPP), and the melt strength of HMSPP increased by more than 12 times compared to that of the virgin iPP. Moreover, HMSPP exhibited excellent foaming ability with smaller cell size, higher cell density, and higher expansion ratio compared to the virgin iPP when supercritical carbon dioxide was used as the blowing agent. POLYM. ENG. SCI., 55:251–259, 2015. © 2014 Society of Plastics Engineers 相似文献
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综述了国内外高熔体强度聚丙烯的研究进展和应用前景,并简述了高熔体强度聚丙烯在挤出涂布和发泡等方面的应用。 相似文献