Co-crystallization in ternary polyethylene blends: tie crystal formation and mechanical properties improvement

被引：21
作者：
Eslamian, Mohammadjavad [1 ]
Bagheri, Reza [1 ]
Pircheraghi, Gholamreza [1 ]
机构：
[1] Sharif Univ Technol, Dept Mat Sci & Engn, Polymer Mat Res Grp, POB 11155-9466, Tehran, Iran
来源：
POLYMER INTERNATIONAL | 2016年 / 65卷 / 12期
关键词：
polyethylene; blend; co-crystallization; mechanical properties; LOW-DENSITY POLYETHYLENE; X-RAY-SCATTERING; LAMELLAR THICKNESS; PHASE SEGREGATION; CRYSTALLIZATION BEHAVIOR; SEMICRYSTALLINE POLYMERS; BRANCHED POLYETHYLENES; TENSILE PROPERTIES; THERMAL-PROPERTIES; MELT MISCIBILITY;
D O I：
10.1002/pi.5191
中图分类号：
O63 [高分子化学（高聚物）];
学科分类号：
070305 ; 080501 ; 081704 ;
摘要：
Understanding the co-crystallization behavior of ternary polyethylene (PE) blends is a challenging task. Herein, in addition to co-crystallization behavior, the rheological and mechanical properties of melt compounded high density polyethylene (HDPE)/low density polyethylene (LDPE)/Zeigler-Natta linear low density polyethylene (ZN-LLDPE) blends have been studied in detail. The HDPE content of the blends was kept constant at 40wt% and the LDPE/ZN-LLDPE ratio was varied from 0.5 to 2. Rheological measurements confirmed the melt miscibility of the entire blends. Study of the crystalline structure of the blends using DSC, wide angle X-ray scattering, small angle X-ray scattering and field emission SEM techniques revealed the formation of two distinct co-crystals in the blends. Fine LDPE/ZN-LLDPE co-crystals, named tie crystals, dispersed within the amorphous gallery between the coarse HDPE/ZN-LLDPE co-crystals were characterized for the first time in this study. It is shown that the tie crystals strengthen the amorphous gallery and play a major role in the mechanical performance of the blend.(c) 2016 Society of Chemical Industry
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页码：1405 / 1416
页数：12
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