Crystallization Behavior and Mechanical Properties of Regiodefective, Highly Stereoregular Isotactic Polypropylene:  Effect of Regiodefects versus Stereodefects and Influence of the Molecular Mass

2005 ◽  
Vol 38 (22) ◽  
pp. 9143-9154 ◽  
Author(s):  
Claudio De Rosa ◽  
Finizia Auriemma ◽  
Marcello Paolillo ◽  
Luigi Resconi ◽  
Isabella Camurati
Keyword(s):  
Mechanical Properties ◽  
Molecular Mass ◽  
Isotactic Polypropylene ◽  
Crystallization Behavior

The effect of hybrid nanoparticle with silica sol as the supporter on the crystallization behavior and mechanical properties of isotactic polypropylene

2015 ◽  
Vol 35 (6) ◽  
pp. 565-573 ◽  
Author(s):  
Juan Li ◽  
Shuhao Qin ◽  
Wentao He ◽  
Yushu Xiang ◽  
Qin Zhang ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Isotactic Polypropylene ◽  
Crystallization Behavior ◽  
Optical Microscope ◽  
Silica Sol ◽  
Hybrid Nanoparticles ◽  
Hybrid Particles ◽  
Scanning Calorimetry ◽  
Chemical Action ◽  
Time Dynamic

Abstract Colloidal dispersions of hybrid nanoparticles with silica sol as the supporter (PKSol) were prepared by supporting aromatic phosphate on silica sol via a chemical action with γ-aminopropyltrimethylsilane (KH550) as a linker in wet process for the first time. Dynamic light scattering (DLS) demonstrated that hybrid nanoparticles with an average size of about 200 nm were formed and transmission electron microscopy (TEM) confirmed the presence of the ultrafine silica sols within the hybrid particles, which exhibited “currant-bun” particle morphologies, rather than typical “core-shell” structures for most polymer-encapsulated silica particles. Compared to aromatic phosphate alone and silane-modified silica sol, the effect of PKSol on the crystallization behavior and mechanical properties of isotactic polypropylene (iPP) was investigated using a polarized optical microscope (POM) and differential scanning calorimetry (DSC). The results demonstrated that PKSol showed superior nucleating ability on iPP than the other two. After adding 0.2 wt% PKSol, the crystallization peak temperature of iPP increased from 116.35°C to 120.81°C and the crystallinity increased from 39.6% to 50%. Correspondingly, the haze decreased from 37.6% to 23.3% and mechanical properties were improved.

scholarly journals Study on non-isothermal crystallization behavior of isotactic polypropylene/bacterial cellulose composites

RSC Advances ◽  
2017 ◽  
Vol 7 (67) ◽  
pp. 42113-42122 ◽  
Author(s):  
Bo Wang ◽  
Hai-Rong Zhang ◽  
Chao Huang ◽  
Lian Xiong ◽  
Jun Luo ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Bacterial Cellulose ◽  
Isotactic Polypropylene ◽  
Isothermal Crystallization ◽  
Crystallization Behavior ◽  
High Crystallinity ◽  
Cellulose Composites

Bacterial cellulose (BC) has great potential to be used as a new filler in reinforced isotactic polypropylene (iPP) due to its characteristics of high crystallinity, biodegradability and efficient mechanical properties.

Crystallization Behavior and Mechanical Properties of Nanosilica-Reinforced Isotactic Polypropylene Composites

2015 ◽  
Vol 30 (5) ◽  
pp. 542-547
Author(s):  
J. Li ◽  
L.-J. Long ◽  
W.-T. He ◽  
K. Zhang ◽  
Y.-S. Xiang ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Isotactic Polypropylene ◽  
Crystallization Behavior ◽  
Polypropylene Composites

scholarly journals Effect of benzoic acid surface modified alumina nanoparticles on the mechanical properties and crystallization behavior of isotactic polypropylene nanocomposites

RSC Advances ◽  
2018 ◽  
Vol 8 (37) ◽  
pp. 20790-20800 ◽  
Author(s):  
Xiaofeng Jiang ◽  
Wenxue Zhang ◽  
Shicheng Zhao ◽  
Shuai Zhou ◽  
YaoQi Shi ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Benzoic Acid ◽  
Isotactic Polypropylene ◽  
Crystallization Behavior ◽  
Mechanical Performance ◽  
Alumina Nanoparticles ◽  
Modified Alumina ◽  
Polypropylene Nanocomposites ◽  
Conformational Ordering ◽  
Surface Modified

The CH–π interactions between polypropylene and functionalized alumina (BA-Al2O3) nanoparticles improve the mechanical performance and conformational ordering of nanocomposites.

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