Unusual hierarchical structures of micro-injection molded isotactic polypropylene in presence of an in situ microfibrillar network and a β-nucleating agent

RSC Advances ◽  
2015 ◽  
Vol 5 (54) ◽  
pp. 43571-43580 ◽  
Author(s):  
Zhongguo Zhao ◽  
Qi Yang ◽  
Miqiu Kong ◽  
Dahang Tang ◽  
Qianying Chen ◽  
...  
Keyword(s):  
Injection Molding ◽  
Isotactic Polypropylene ◽  
Hierarchical Structures ◽  
Nucleating Agent ◽  
Morphological Development ◽  
Micro Injection Molding ◽  
Injection Molded

The morphological development of iPP in presence of an in situ microfibrillar network and a β-nucleating agent under micro-injection molding.

In situ generation of a self-dispersed β-nucleating agent with increased nucleation efficiency in isotactic polypropylene

Polymer ◽  
2018 ◽  
Vol 151 ◽  
pp. 84-91 ◽  
Author(s):  
Shicheng Zhao ◽  
Wei Qin ◽  
Zhong Xin ◽  
Shuai Zhou ◽  
Hanzhang Gong ◽  
...  
Keyword(s):  
Isotactic Polypropylene ◽  
Nucleating Agent ◽  
In Situ Generation

Warpage Measurement of a Micro Electrical Fan on Micro-Injection Molding

2012 ◽  
Vol 184-185 ◽  
pp. 1651-1654
Author(s):  
Jeou Long Lee ◽  
Y. Lin ◽  
Y.K. Shen
Keyword(s):  
Injection Molding ◽  
Injection Pressure ◽  
Acrylonitrile Butadiene Styrene ◽  
Mold Temperature ◽  
Micro Injection Molding ◽  
Optimum Result ◽  
Suitable Material ◽  
Packing Pressure ◽  
Injection Molded ◽  
Packing Time

This study characterizes warpage of a micro-injection molded micro electrical fan using the Michelson interference method. This study conducts experiments to analyze different polymers-polypropylene (PP), polyamide (PA), acrylonitrile-butadiene styrene (ABS), ABS+ polycarbonate (PC), and polyoxymethylene (POM)-process parameters, such as mold temperature, injection temperature, injection pressure, injection time, packing time, and packing pressure, for a micro electrical fan. To obtain the optimum result (minimum warpage), this study assesses the effect (warpage) of each material on micro-injection molding. PA plastic is the very suitable material for micro electrical fan with Michelson interference analysis on micro-injection molding.

Electrical Contact Properties of Micro-Injection Molded Polypropylene/CNT/CB-Composites on Metallic Electrodes

2015 ◽  
Vol 1103 ◽  
pp. 77-83 ◽  
Author(s):  
Michael Heinrich ◽  
Ricardo Decker ◽  
Joerg Schaufuss ◽  
Juergen Troeltzsch ◽  
Jan Mehner ◽  
...  
Keyword(s):  
Injection Molding ◽  
Large Scale ◽  
Electrical Contact ◽  
Influential Factors ◽  
Scale Production ◽  
Micro Injection Molding ◽  
Micro Electro Mechanical Systems ◽  
Aspect Ratios ◽  
Injection Molded ◽  
The One

The investigations carried out under this work dealing with a new field of application for large-scale production of electric contacting processes for micro-electro-mechanical systems (MEMS) using the micro-injection molding technology. The focus of this article is the analysis of process-related influential factors of micro-injection molding that determines both the electrical resistivity and the flowability of polymer nanocomposites filled with carbon nanotubes (CNT) and carbon black (CB). For that, the viscosity and the electrical conductivity as a function of different CNT-and CB-contents and their combination were investigated in a manufacturing study for Polypropylene. The results of the investigations answered questions regarding material science and technical processes. By this, optimal rheological properties for formation of micro injection molded conductive patterns with high aspect ratios on the one side and with the best possible conductivity of the nanocomposites on the other side can be set.

In situ formation of zinc phthalate as a highly dispersed β-nucleating agent for mechanically strengthened isotactic polypropylene

2019 ◽  
Vol 358 ◽  
pp. 1243-1252 ◽  
Author(s):  
Wei Qin ◽  
Zhong Xin ◽  
Chunmeng Pan ◽  
Shibao Sun ◽  
Xiaofeng Jiang ◽  
...  
Keyword(s):  
Isotactic Polypropylene ◽  
Nucleating Agent ◽  
Highly Dispersed ◽  
In Situ Formation

Morphology design of isotactic polypropylene composites

2017 ◽  
Vol 31 (9) ◽  
pp. 1252-1262
Author(s):  
Shiwei Wang ◽  
Yuting Leng ◽  
Guangan Zhang ◽  
Ruonan Wang ◽  
Shuaijiang Ma ◽  
...  
Keyword(s):  
Isotactic Polypropylene ◽  
High Performance ◽  
Polarized Light ◽  
Nucleating Agent ◽  
Interfacial Region ◽  
Polypropylene Composites ◽  
Composites Materials ◽  
High Performance Polymer ◽  
Injection Molded ◽  
New Perspective

In this article, the high-performance polymer composites were prepared based on the morphology designing method. To begin with, the beta transcrystalline morphology in the interfacial region of isotactic polypropylene (iPP) composites supported by single carbon fiber was formed by the induction of beta nucleating agent (NA) and verified using the polarized light microscopy. Then, to further explore the application of the beta transcrystalline morphology, the way of induction by supported NA was introduced into the iPP injection-molded samples. The result showed that a certain number of interfacial beta transcrystallinity was formed in the adjacent region of carbon nanotubes–modified iPP injection-molded samples. Herein, the mechanical properties are closely related to the interfacial beta transcrystalline morphology, the convective evidence was the improvement of the sample’s impact strength by seven times. Therefore, this work gives a new perspective for the preparation of high-performance composites materials via morphology designing.

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