线性低密度聚乙烯（LLDPE）是乙烯与少量α-烯烃共聚形成在线性乙烯的主链上，带有非常短小的共聚单体支链的分子结构。 线性低密度聚乙烯为无毒、无味、无臭的乳白色颗粒，密度为0.918~0.935g/cm 3。 它与LDPE相比，具有较高的软化温度和熔融温度，有强度大、韧性好、刚性大、耐热、耐寒性好等优点，还具有良好的耐环境应力开裂性，耐冲击强度、耐撕裂强度等性能，并可耐酸、碱、有机溶剂等而广泛用于工业、农业、医药、卫生和日常生活用品等领域。 …

The MWD of a resin depends on how it was produced, i.e. the catalyst type, reactor conditions, etc. Molecular weight distribution can range from between 2 and 20 and, typically, for LLDPE, MWD are between 3.5 and 4.0 for single reactor polymers.

2022年11月2日 · Molecular weight distribution (MWD) and short chain branching distribution (SCBD) play a decisive role in the performance of linear low-density polyethylene (LLDPE). A model based on a non-standard polymerization reaction scheme is developed for ethylene/α-olefin gas phase copolymerization in a fluidized bed reactor.

MWD -- molecular weight distribution, Vinylidene groups, composition, aging I. INTRODUCTION Linear low density polyethylene (LLDPE) is synthesized in the presence of a titanium-chromium catalyst and differs from each other by the length of the side branch. LLDPE-1 is a copolymer of ethylene with hexene-1, where the butyl groups (-СН

LLDPE terpolymer added to HDPE (at a content ≥ 25 wt.%) simultaneously increases flow properties and improves tensile properties of the blend at −45 °C. Changes in low-temperature properties as a function of molecular weight, MWD, crystallinity, and branch content were determined for HDPE, LLDPE, and their blends.

2023年12月27日 · 更窄的mwd，改进了共聚单体分布，有更好的薄膜透明度、密封性和冲击强度，这些与用 齐格勒催化剂 生产的lldpe相似。在透明度这一特性上，lldpe具有与ldpe相似的缺点。

在 TAPPI-2000 上，据报道 [1] 不同类型的高性能己烯线性低密度聚乙烯 (HPH-LLDPE) 在鲨鱼皮熔体破裂 (SSMF) 的发生方面表现不同，这取决于分子量的宽度分布（MWD）。 MWD 差异很小而且很微妙，但对熔体破裂开始的影响是显着的。 本研究是这项工作的延续，通过在足够高的剪切速率条件下进行比较研究，以在窄和宽 MWD LLDPE 中引起熔体破裂。 然后逐步添加含氟聚合物加工助剂 (PPA)，直至消除熔体破裂。 发现窄 MWD 树脂需要两倍以上的 PPA 量才能消除 …

2004年5月1日 · It has been shown that scission kinetics strongly affects the molecular weight distribution (MWD) of low-density polyethylene (ldPE) in a continuous stirred tank reactor (CSTR). The present paper focuses on the effects of different chemical scission mechanisms, linear and topological scission, as well as mechanical scission on MWD in batch and ...

2024年8月26日 · 线性低密度 聚乙烯 （LLDPE）是一种由乙烯与少量α-烯烃在线型乙烯主链上共聚而成的分子结构，共聚单体支链很短。 线性低密度聚乙烯为无毒、无味、无臭的乳白色颗粒，密度为0.918~0.935g/cm³。 与LDPE相比，其软化温度和熔融温度较高，具有强度高、韧性好、刚性大、耐热、耐寒性好等优点，还具有良好的耐环境应力开裂性、冲击强度、撕裂强度等性能，耐酸、碱、有机溶剂等，广泛应用于工业、农业、医药卫生及日常生活用品等。 线性低密度聚乙 …

Molecular weight distribution (MWD) can be represented by the ratio of two melt indexes measured at two different forces, 21.2 kg/2.12 kg, called the melt flow ratio, MFR. Density is used as a