Tailoring the Physical Properties of Isotactic Polypropylene through Incorporation of Comonomers and the Precise Control of Stereo- and Regioregularity by Metallocene Catalysts

2007 ◽  
Vol 19 (21) ◽  
pp. 5122-5130 ◽  
Author(s):  
Claudio De Rosa ◽  
Finizia Auriemma ◽  
Odda Ruiz de Ballesteros ◽  
Luigi Resconi ◽  
Isabella Camurati
Keyword(s):  
Physical Properties ◽  
Isotactic Polypropylene ◽  
Metallocene Catalysts ◽  
Precise Control

Mechanism of Isotactic Polypropylene Formation withC1-Symmetric Metallocene Catalysts

2006 ◽  
Vol 25 (15) ◽  
pp. 3576-3592 ◽  
Author(s):  
Stephen A. Miller ◽  
John E. Bercaw
Keyword(s):  
Isotactic Polypropylene ◽  
Metallocene Catalysts

scholarly journals Single molecules and single nanoparticles as windows to the nanoscale

2018 ◽  
Vol 49 (2) ◽  
pp. 14-17
Author(s):  
Martín Caldarola ◽  
Michel Orrit
Keyword(s):  
Physical Properties ◽  
Optical Sensors ◽  
New Technology ◽  
Optical Detection ◽  
Single Molecules ◽  
Precise Control ◽  
Atoms And Molecules ◽  
Matter Interaction ◽  
Light Matter Interaction ◽  
Properties Of Materials

Since the first optical detection of single molecules, they have been used as nanometersized optical sensors to explore the physical properties of materials and light-matter interaction at the nanoscale. Understanding nanoscale properties of materials is fundamental for the development of new technology that requires precise control of atoms and molecules when the quantum nature of matter cannot be ignored. In the following lines, we illustrate this journey into nanoscience with some experiments from our group.

Interferometric determination of the physical properties of annealed isotactic polypropylene fibers

2018 ◽  
Vol 59 (1) ◽  
pp. 35-41 ◽  
Author(s):  
Khaled M. Yassien ◽  
Magda Abd-Elrahman ◽  
Mohamed A. El-Bakary
Keyword(s):  
Physical Properties ◽  
Isotactic Polypropylene ◽  
Polypropylene Fibers

Physical properties of polyamide 6/metallocene isotactic polypropylene conjugated filaments

2006 ◽  
Vol 101 (3) ◽  
pp. 1471-1476 ◽  
Author(s):  
Kai-Jen Hsiao ◽  
Zhi-Feng Jue ◽  
Dan-Cheng Kong ◽  
Frank L Chen
Keyword(s):  
Physical Properties ◽  
Isotactic Polypropylene ◽  
Polyamide 6

scholarly journals Precise control of synthetic hydrogel network structure via linear, independent synthesis-swelling relationships

2021 ◽  
Vol 7 (7) ◽  
pp. eabe3245
Author(s):  
N. R. Richbourg ◽  
M. Wancura ◽  
A. E. Gilchrist ◽  
S. Toubbeh ◽  
B. A. C. Harley ◽  
...  
Keyword(s):  
Physical Properties ◽  
Network Structure ◽  
A Priori ◽  
Polymer Concentration ◽  
Polymer Network ◽  
Network Models ◽  
Poly Vinyl Alcohol ◽  
Glycol Diacrylate ◽  
Synthesis Conditions ◽  
Precise Control

Hydrogel physical properties are tuned by altering synthesis conditions such as initial polymer concentration and polymer–cross-linker stoichiometric ratios. Traditionally, differences in hydrogel synthesis schemes, such as end-linked poly(ethylene glycol) diacrylate hydrogels and cross-linked poly(vinyl alcohol) hydrogels, limit structural comparison between hydrogels. In this study, we use generalized synthesis variables for hydrogels that emphasize how changes in formulation affect the resulting network structure. We identify two independent linear correlations between these synthesis variables and swelling behavior. Analysis through recently updated swollen polymer network models suggests that synthesis-swelling correlations can be used to make a priori predictions of the stiffness and solute diffusivity characteristics of synthetic hydrogels. The same experiments and analyses performed on methacrylamide-modified gelatin hydrogels demonstrate that complex biopolymer structures disrupt the linear synthesis-swelling correlations. These studies provide insight into the control of hydrogel physical properties through structural design and can be used to implement and optimize biomedically relevant hydrogels.

Structure−Property Correlations in Polypropylene from Metallocene Catalysts:  Stereodefective, Regioregular Isotactic Polypropylene

2004 ◽  
Vol 126 (51) ◽  
pp. 17040-17049 ◽  
Author(s):  
Claudio De Rosa ◽  
Finizia Auriemma ◽  
Annunziata Di Capua ◽  
Luigi Resconi ◽  
Simona Guidotti ◽  
...  
Keyword(s):  
Isotactic Polypropylene ◽  
Metallocene Catalysts ◽  
Structure Property ◽  
Property Correlations
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