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首页> 外文期刊>Journal of Applied Polymer Science >MELT RHEOLOGICAL AND THERMODYNAMIC PROPERTIES OF POLYETHYLENE HOMOPOLYMERS AND POLY(ETHYLENE/ALPHA-OLEFIN) COPOLYMERS WITH RESPECT TO MOLECULAR COMPOSITION AND STRUCTURE
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MELT RHEOLOGICAL AND THERMODYNAMIC PROPERTIES OF POLYETHYLENE HOMOPOLYMERS AND POLY(ETHYLENE/ALPHA-OLEFIN) COPOLYMERS WITH RESPECT TO MOLECULAR COMPOSITION AND STRUCTURE

机译：聚乙烯均聚物和聚乙烯（乙烯/α-烯烃）共聚物在分子组成和结构方面的熔体流变学和热力学性质

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Various types of polyethylene homopolymers and copolymers, including linear high-density polyethylene (HDPE), branched low-density polyethylene (BLDPE), poly(ethylene vinyl acetate) copolymer (EVA), heterogeneous linear poly(ethylene/alpha-olefin) copolymer (het-LEAO) or commonly known as linear low-density polyethylene, homogeneous linear poly(ethylene/alpha-olefin) copolymer (hom-LEAO), and homogeneous branched poly(ethylene/alpha-olefin) copolymer (hom-BEAO), were evaluated for their melt theological and thermodynamic properties with emphasis on their molecular structure. Short-chain branching (SCB) mainly controls the density, but it has little effect on the melt theological properties. Long-chain branching (LCB) has little effect on the density and thermodynamic properties, but it has drastic effects on the melt theological properties. LCB increases the pseudoplasticity and the flow activation energy for both the polyethylene homopolymer and copolymer. Compared at a same melt index and a similar density, hom-LEAO has the highest viscosity in processing among all polymers due to its linear molecular structure and very narrow molecular weight distribution. Small amounts of LCB in hom-BEAO very effectively reduce the average viscosity and also improve the flow stability. Both hom-LEAO and hom-BEAO, unlike het-LEAO, have thermodynamic properties similar to BLDPE. (C) 1996 John Wiley & Sons, Inc. [References: 10]
机译：各种类型的聚乙烯均聚物和共聚物，包括线性高密度聚乙烯（HDPE），支化低密度聚乙烯（BLDPE），聚（乙烯乙酸乙烯酯）共聚物（EVA），异质线性聚（乙烯/α-烯烃）共聚物（ het-LEAO）或通常称为线性低密度聚乙烯，均相线性聚（乙烯/α-烯烃）共聚物（hom-LEAO）和均相支化聚乙烯（乙烯/α-烯烃）共聚物（hom-BEAO）评估了它们的熔体流变学和热力学性质，重点是分子结构。短链支化（SCB）主要控制密度，但对熔体的流变学性质影响不大。长链支化（LCB）对密度和热力学性质影响不大，但对熔体的流变学性质却具有重大影响。 LCB增加了聚乙烯均聚物和共聚物的假塑性和流动活化能。在相同的熔体指数和相似的密度下进行比较，hom-LEAO由于其线性分子结构和非常窄的分子量分布，在所有聚合物中的加工粘度最高。 hom-BEAO中的少量LCB可以非常有效地降低平均粘度，并改善流动稳定性。与het-LEAO不同，hom-LEAO和hom-BEAO都具有类似于BLDPE的热力学性质。 （C）1996 John Wiley＆Sons，Inc. [参考：10]

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