Hierarchy structure in injection molded polypropylene/ethylene–octane copolymer blends

2007 ◽  
Vol 105 (4) ◽  
pp. 2252-2259 ◽  
Author(s):  
Jiang Li ◽  
Xiaoqing Zhang ◽  
Cheng Qu ◽  
Qin Zhang ◽  
RongNi Du ◽  
...  
Keyword(s):  
Copolymer Blends ◽  
Injection Molded

scholarly journals Effect of Mold Temperature on the Impact Behavior and Morphology of Injection Molded Foams Based on Polypropylene Polyethylene–Octene Copolymer Blends

Polymers ◽  
2019 ◽  
Vol 11 (5) ◽  
pp. 894 ◽  
Author(s):  
Santiago Muñoz-Pascual ◽  
Eduardo Lopez-Gonzalez ◽  
Cristina Saiz-Arroyo ◽  
Miguel Angel Rodriguez-Perez
Keyword(s):  
Impact Resistance ◽  
Mold Temperature ◽  
Impact Behavior ◽  
Critical Parameters ◽  
Crystalline Morphology ◽  
Copolymer Blends ◽  
Opposite Trend ◽  
Izod Impact ◽  
Injection Molded ◽  
The Impact

In this work, an isotactic polypropylene (PP) and a polyethylene–octene copolymer (POE) have been blended and injection-molded, obtaining solids and foamed samples with a relative density of 0.76. Different mold temperature and injection temperature were used. The Izod impact strength was measured. For solids, higher mold temperature increased the impact resistance, whereas in foams, the opposite trend was observed. In order to understand the reasons of this behavior, the morphology of the elastomeric phase, the crystalline morphology and the cellular structure have been studied. The presence of the elastomer near the skin in the case of high mold temperature can explain the improvement produced with a high mold temperature in solids. For foams, aspects as the elastomer coarsening in the core of the sample or the presence of a thicker solid skin are the critical parameters that justify the improved behavior of the materials produced with a lower mold temperature.

Influence of Process Parameters on the Morphologies of Micro-Injection Molded Polyformaldehyde Parts

2019 ◽  
Vol 34 (3) ◽  
pp. 367-375
Author(s):  
L.-X. Wang ◽  
D.-F. Wang ◽  
L. Jiang ◽  
N. Bian ◽  
Q. Li ◽  
...  
Keyword(s):  
Process Parameters ◽  
Influence Of Process Parameters ◽  
Injection Molded
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