熔体强度
- 网络Melt Strength;meltstrength
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但由于PP的高结晶性,熔体强度低,其发泡成型较为困难。
Nevertheless foaming processing of PP is very difficult because of its high crystallinity and poor melt strength .
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线性结构的常规PET因为熔体强度差,不适用于挤出发泡成型。
Conventional PET with linear molecular structure is not suitable for extrusion foaming process due to its poor melt strength .
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通过长链支化来改性PP,从而得到高熔体强度的PP。
High-melt-strength polypropylene is achieved with modified PP through long chain branching .
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但PP的熔体强度低、发泡性能差,很难制得泡孔结构较好的泡沫产品。
However , the foaming property of PP is ( very ) poor because of its low melt strength .
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高熔体强度棚膜专用LLDPE树脂的研制
Preparation of high melt strength LLDPE for greenhouse film
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聚对苯二甲酸乙二醇酯(PET)的扩链反应是一种提高PET分子量和熔体强度的有效方法。
Chain Extension is one of an effective methods for increasing the molecular weight and improving the melt strength of Poly ( ethylene terephthalate )( PET ) .
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研究表明:具有显著应变硬化行为和高熔体强度的长链支化聚丙烯是获得优质PP发泡材料的前提;
The research results showed that the long-chain branched polypropylene with remarkable strain hardening behavior and high melt strength was the premise in the production of excellent polypropylene foam .
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6380M流动性好,其临界剪切速率高,但熔体强度不及单峰HDPE。
In addition , 6380 M has a good flowability and high critical shear rate , though its melt strength is inferior to unimodal HDPE .
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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。
High melt strength polypropylene ( HMSPP ) is an important product of polypropylene modification with wide application .
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课题研究的关键是长支链接枝PP的生成以提高熔体强度以及降解、交联副反应的控制。
The hinges of this study included the formation of longer side chains in order to acquire higher bath strength and the control of degradation of iPP and cross-linking side reactions .
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为了改善聚丙烯(PP)的微孔发泡性能,本文首先将PP与高密度聚乙烯(HDPE)共混,提高其熔体强度;
In order to improve the microcellular foam ability of polypropylene ( PP ), PP was firstly blended with high density polyethylene ( HDPE ) to enhance the melt strength .
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实验表明:ACR加工助剂能够促进PVC体系的塑化,提高熔体强度及均匀性,对PVC的力学性能没有明显的不良影响。
The experiments showed that ACR processing additive could promote the plasticization of PVC , increase the intensity and homogeneity of melt , and had no obvious bad effects .
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通过辐照法制备了长支链型高熔体强度聚丙烯(LCB-HMSPP),采用高级流变扩展系统(ARES)表征了其熔体黏弹性,采用毛细管流变仪研究了其在高剪切速率下的流变行为。
High-melt-strength polypropylene with long chain branching ( LCB-HMSPP ) was prepared via irradiation .
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因此,为了提升CPP在泡沫塑料应用中的竞争力,必须对其进行改性,提高其熔体强度。
Therefore , it is need to modify the CPP properties , improve the melt strength , in order to exalt its competence in the application of foam plastics .
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研究了高熔体强度聚丙烯(HMSPP)/共聚聚丙烯(PP)/低密度聚乙烯共混体系的发泡性能。
This paper studied foaming capacity of a blending system consisting of high-melt strength polypropylene ( HMSPP ), copolymer of propylene ( PP ) and low density polyethylene .
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PPC的加入对PLA的结晶度无明显变化,但共混物熔体强度明显降低,导致泡孔尺寸增大。
It was found that the crystallinity of the blend did not change obviously with the adding of PPC , but the melt strength was weakened so that increased the cell size .
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结果表明,PETG的熔体强度可以进行调节。
From experiment results , it can be found that the PETG melt intensity can be controlled .
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通过反应挤出法对聚丙烯(PP)进行硅烷接枝交联改性获得高熔体强度PP(HMSPP),并对HMSPP的发泡性能及影响因素进行了研究。
High-melt-strength polypropylene ( HMSPP ) was prepared by silane-grafting and cross-linking of polypropylene ( PP ) through reactive extrusion , and the HMSPP foam was fabricated by extrusion .
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然而PLA在加工使用中,普遍存在着质硬且脆、热变形温度低和熔体强度低等弊端,严重制约了PLA的应用,因此需进行必要的改性。
However , there are many problems such as hard and brittle texture , low heat distortion temperature and low melt strength during the processing and utilization , which have seriously hampered the application of PLA .
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当熔体强度适宜时,ADC发泡剂添加量越多,在熔体中形成的气泡也越多,制品的密度越小。
And when the melt strength is appropriate , with the increase of adding ( amount ) of foaming agent ADC , the number of gas bubbles in the melts increases and the product density becomes lower .
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本文采用流变学方法从剪切流变和拉伸流变两方面,通过对剪切粘度、储能模量和损耗模量、松弛时间谱和拉伸粘度的表征,对四种具有不同分子结构PET的熔体强度进行分析。
In this work , the melt strength and viscoelasticity of four types of PET was analyzed through characterization of shear rheology and extensional rheology of PETs , including the dynamic complex viscosity , storage and loss modulus , relaxation spectrum , and extensional viscosity .
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熔体强度在1.0MPa以上;
The melt strength is more than 1.0MPa ;
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HDPE的熔体强度很低导致发泡效果很差,而交联HDPE和回料PE都有较高的熔体强度,从而改善了制品的发泡性能,提高了制品的发泡率。
The HDPE exhibited low melt strength and led to poor foaming effectiveness . The crosslinking HDPE and recycled PE had higher melt strength , thus improving the performance of the foam products and increasing the foam rate of the products . 5 .
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通过熔体强度、熔体黏度测试和熔体流动速率(MFR)、凝胶含量的变化研究了试剂体系对接枝交联改性的作用。
The effects of the agent system on the modification were investigated by testing melt-strength , melt viscosity , the changes of melt flow rate ( MFR ) and gel content .
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用Jeziorny法求出的参数Zc和n随冷却速率的增加而增加,但高熔体强度聚丙烯的Zc和n值略大于线性聚丙烯的Zc和n。
The values of Z_c and n increased with increase in cooling rate , and the values of Z_c and n of high melt strength PP were higher than those of conventional PP at the same cooling rate .
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寻找简单易行,成本低廉,行之有效的高熔体强度聚丙烯(HMSPP)的制备方法是制备聚丙烯发泡材料的最关键的技术。
It is the most pivotal technology to research for a simple , low costing and effective method of preparing high-melt-strength PP ( HMSPP ) .
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结果显示,改性PP的MFR可降低至0.5g/10min以下,熔体强度提高4.1倍,熔体剪切黏度提高1.707倍;
The results showed that MFR of modified PP decreased to below 0.5g / 10min , and its melt-strength was improved 4.1 times , while its melt viscosity was improved 1.707 times .
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而采用接枝高熔体强度聚丙烯(HMSPP)可以获得更多更好的闭孔泡孔结构。
In contrast , the more and better closed cells can be obtained in the foam structure of the high melt strength polypropylene ( HMSPP ) .
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但是普通PP熔融以后,黏度急剧下降,熔体强度非常低,容易引起气泡的合并、气体的逃逸甚至泡孔的塌陷,很难得到泡孔结构好的泡沫塑料。
However , the melt viscosity and melting strength of general PP were sharply decline after melting , which lead to bubble combination , gas escape and cell collapse , so that the foamability of PP is poor and difficult to be processed to foam products with good cellular structure .
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对齐鲁PE100级燃气管专用料DGDB2480HBK的力学性能、耐慢速裂纹增长性能、熔体强度等进行了研究与分析。
Studies and analyzes mechanical property , creep crack propagation resistance and melt strength of Qilu PE100 gas pipe speciality resin DGDB2480HBK .