Combined effect of shear and nucleating agent on the multilayered structure of injection-molded bar of isotactic polypropylene

2009 ◽  
Vol 112 (3) ◽  
pp. 1104-1113 ◽  
Author(s):  
Jing Cao ◽  
Ke Wang ◽  
Wen Cao ◽  
Qin Zhang ◽  
RongNi Du ◽  
...  
Keyword(s):  
Isotactic Polypropylene ◽  
Nucleating Agent ◽  
Multilayered Structure ◽  
Combined Effect ◽  
Injection Molded

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.

scholarly journals Poly(Acrylonitrile–Butadiene–Styrene) as a Special β-Nucleating Agent on the Toughness of Isotactic Polypropylene

Polymers ◽  
2019 ◽  
Vol 11 (11) ◽  
pp. 1894
Author(s):  
Jingru Liu ◽  
Xinxu Zhu ◽  
Zheng Cao
Keyword(s):  
Isotactic Polypropylene ◽  
Acrylonitrile Butadiene Styrene ◽  
Nucleating Agent ◽  
Scanning Calorimetry ◽  
Molding Method ◽  
Stress Transmission ◽  
Injection Molded ◽  
The Impact ◽  
Poly Acrylonitrile ◽  
Butadiene Styrene

The influence of poly(acrylonitrile–butadiene–styrene) (ABS) as a special β-nucleating agent on the impact and tensile properties of isotactic polypropylene (iPP) were investigated by dynamic rheological measurements, wide-angle X-ray diffraction (WAXD), differential scanning calorimetry (DSC), scanning electron microscopy (SEM), and mechanical properties tests. It is found that the β nucleation efficiency of ABS is closely related to its concentration, dispersibility, and molding method for the iPP/ABS blends. The content of β-crystal (Kβ) rises with the incorporation of ABS and shows a maximum with the introduction of 1% ABS for compression-molded blends and 2% ABS for injection-molded blends, respectively, which is followed by a decrease in Kβ. The addition of a small amount of ABS has a significant reinforcing and toughening effect on iPP. Compared with the compression-molded samples, the ABS dispersed phase in injection-molded samples has a smaller particle size and a larger specific surface area, which are favorable for stress transmission and higher β nucleation efficiency, and therefore, better tensile and impact properties can be expected.

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.

scholarly journals Effect of Neutralizer on Transparency of Nucleating Agent-Containing Polypropylene

Polymers ◽  
2021 ◽  
Vol 13 (5) ◽  
pp. 680
Author(s):  
Shohei Iwasaki ◽  
Yohei Uchiyama ◽  
Miwa Tenma ◽  
Masayuki Yamaguchi
Keyword(s):  
Isotactic Polypropylene ◽  
Nucleating Agent ◽  
Calcium Stearate ◽  
Injection Molded

The effects of neutralizer species on the transparency of injection-molded plates were studied using isotactic polypropylene (PP) containing a crystal nucleating agent—i.e., 1,3:2,4-bis-o-(4-methylbenzylidene)-d-sorbitol (MDBS). A plate containing lithium stearate (StLi) was more transparent than one containing calcium stearate (StCa) when the MDBS content was 0.1 wt. %. The addition of StLi accelerated the formation of MDBS fibers and the crystallization of PP. However, when the MDBS content was 1.0 wt. %, StCa improved the transparency more effectively than StLi. These results indicate that the combination of an appropriate amount of MDBS and the correct neutralizer species is critical for enhancing the transparency of injection-molded PP plates.

Unusual Tuning of Mechanical Properties of Isotactic Polypropylene Using Counteraction of Shear Flow and β-Nucleating Agent on β-Form Nucleation

2009 ◽  
Vol 42 (12) ◽  
pp. 4343-4348 ◽  
Author(s):  
Yan-Hui Chen ◽  
Gan-Ji Zhong ◽  
Yan Wang ◽  
Zhong-Ming Li ◽  
Liangbin Li
Keyword(s):  
Mechanical Properties ◽  
Shear Flow ◽  
Isotactic Polypropylene ◽  
Nucleating Agent

A novel highly efficient β-nucleating agent for isotactic polypropylene

2011 ◽  
Vol 123 (1) ◽  
pp. 108-117 ◽  
Author(s):  
Shicheng Zhao ◽  
Na Xu ◽  
Zhong Xin ◽  
Changquan Jiang
Keyword(s):  
Isotactic Polypropylene ◽  
Nucleating Agent ◽  
Highly Efficient

scholarly journals Crystalline modification of a rare earth nucleating agent for isotactic polypropylene based on its self-assembly

2018 ◽  
Vol 5 (5) ◽  
pp. 180247 ◽  
Author(s):  
Yuanming Zhang ◽  
Tingting Sun ◽  
Wei Jiang ◽  
Guangting Han
Keyword(s):  
Hydrogen Bond ◽  
Rare Earth ◽  
Isotactic Polypropylene ◽  
Self Assembly ◽  
Dendritic Structure ◽  
Nucleating Agent ◽  
The Self ◽  
Structure Evolution ◽  
Crystalline Modification ◽  
Assembly Structure

In this paper, the crystalline modification of a rare earth nucleating agent (WBG) for isotactic polypropylene (PP) based on its supramolecular self-assembly was investigated by differential scanning calorimetry, wide-angle X-ray diffraction and polarized optical microscopy. In addition, the relationship between the self-assembly structure of the nucleating agent and the crystalline structure, as well as the possible reason for the self-assembly behaviour, was further studied. The structure evolution of WBG showed that the self-assembly structure changed from a needle-like structure to a dendritic structure with increase in the content of WBG. When the content of WBG exceeded a critical value (0.4 wt%), it self-assembled into a strip structure. This revealed that the structure evolution of WBG contributed to the K β and the crystallization morphology of PP with different content of WBG. In addition, further studies implied that the behaviour of self-assembly was a liquid–solid transformation of WBG, followed by a liquid–liquid phase separation of molten isotactic PP and WBG. The formation of the self-assembly structure was based on the free molecules by hydrogen bond dissociation while being heated, followed by aggregation into another structure by hydrogen bond association while being cooled. Furthermore, self-assembly behaviour depends largely on the interaction between WBG themselves.

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