PE100管材专用料耐压性能与分子结构的分析
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摘要
采用凝胶渗透色谱分析(GPC)、管材静液压测试等方法研究并对比了国产Hostalen淤浆工艺生产的不同批次PE100管材专用料HM100的结构与性能,考察了HM100批次性能的稳定性,PE100管材专用料耐压性能与基础物性、力学性能以及分子结构之间的关系。结果表明:HM100批次之间工艺调整频繁,指标波动范围大,导致其管材制品的性能不稳定,尤其是耐压性能;HM100的力学性能与其管材制品的耐压性能无直接相关性;HM100的分子结构不合理,说明其结晶结构以及系带分子结构均存在缺陷,这也是导致部分产品耐压实验不合格最重要的因素之一,因此,必须从聚合工艺的角度进行优化,调控分子结构,进一步提升产品的耐压性能。
The structure and performance were investigated by gel permeation chromatography( GPC),pipe hydrostatic test and so on. The performance stability of different product batches and the relationship between molecular structure and pressure resistance of PE100 pipe resins were studied. The results showed that the polymerization process of HM100 was changed frequently,and the range of indexes was wider than contrast products,so the performance of the pipe was not stable,especially the pressure resistance. There was no direct correlation between mechanical properties and pressure resistance for HM100. The molecular structure of HM100 was not reasonable,which showed that the crystal structure and the molecular structure of the frenulum were defective,and it was also one of the most important factors that affected the performance of the pressure resistance. It should be optimized from the perspective of polymerization process,regulated the molecular structure,and further improved the pressure resistance of the product.
The structure and performance were investigated by gel permeation chromatography( GPC),pipe hydrostatic test and so on. The performance stability of different product batches and the relationship between molecular structure and pressure resistance of PE100 pipe resins were studied. The results showed that the polymerization process of HM100 was changed frequently,and the range of indexes was wider than contrast products,so the performance of the pipe was not stable,especially the pressure resistance. There was no direct correlation between mechanical properties and pressure resistance for HM100. The molecular structure of HM100 was not reasonable,which showed that the crystal structure and the molecular structure of the frenulum were defective,and it was also one of the most important factors that affected the performance of the pressure resistance. It should be optimized from the perspective of polymerization process,regulated the molecular structure,and further improved the pressure resistance of the product.
引文
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[2]王浩水,王文清.PE 100级管材专用树脂性能研究[J].合成树脂及塑料,2006,23(4):24-26.
[3]毕家林,李连鹏,胡建洪,等.国内外PE100级管材专用料的发展和应用概况[J].弹性体,2014,24(2):73-79.
[4]唐岩,王群涛,石志俭等.PE100级管材专用树脂的开发[J].合成树脂及塑料,2005,22(5):5-8.
[5]王群涛.PE100聚乙烯管材料的结构与性能研究[D].上海:华东理工大学,2012.12.
[6]王华,杨勇,宋磊等.不同工艺生产的高耐压等级管材专用HDPE的结构与性能[J].合成树脂及塑料,2016,33(4):67-71.
[7]吴桐,蔡燎原,蓝芳,等.PE100管材专用料的结构与性能[J].高分子材料科学与工程,2014,30(2):77-82.
[8]孙鑫,申红望,谢邦互,等.摩尔质量分布的双峰相对高度对聚乙烯断裂及力学性能的影响[J].塑料工业,2011,39(2):75-77.
[9]VANDERMIERS C,MOULIN J F,DAMMAN P,et a1.Characterization of molecular heterogeneities of LLDPE by multiple crystallizationdissolution steps[J].Polymer,2000,41(8):2915-2923.
[10]WANG Y J,YAN W D.Investigation on chain structure of LLDPE obtained byethylene in-situ copolymerization with DSC and XRD[J].Chinese Science Bulletin,2007,52(6):736-742.
[11]CHEN F,SHANKS R A,AMARASINGHE G.Molecular distribution analysis of melt-crystallized ethylene copolymers[J].Polymer International,2004,53(11):1795-1805.
[12]唐岩,毕丽景,李延亮.PE管材发生慢速裂纹扩展的影响因素[J].合成树脂及塑料,2003,20(3):52-59.
[13]谢侃,唐岩,李延亮.聚乙烯管材料抵抗慢速裂纹扩展性能研究[J].中国塑料,2005,19(3):20-23.
[14]LU X C,ISHIKAWA N,BROWN N.The critical molecular weight for resisting slow crack growth in polyethy1ene[J].Journal of Polymer Science,1996,34(10):1809-1815.
[15]HUBERT L,DAVID L,GERMAIN Y,et al.Optinlization of long term properties of polyethylene[J].Material Technology,2000,88(7/8):29-33.
[16]PSRSONS M,STEPANOV E V,HILTNER A et al.Correlation of fatigue and creep slow crack growth in a medium density polyethylene pipe material[J].Journal of Material Science,2000,35(11):2659-2674.