Dynamic glass transition of the rigid amorphous fraction in polyurethane-urea/SiO2 nanocomposites

Soft Matter ◽  
2017 ◽  
Vol 13 (26) ◽  
pp. 4580-4590 ◽  
Author(s):  
Stefanos Koutsoumpis ◽  
Konstantinos N. Raftopoulos ◽  
Oguzhan Oguz ◽  
Christine M. Papadakis ◽  
Yusuf Z. Menceloglu ◽  
...  
Keyword(s):  
Glass Transition ◽  
Rigid Amorphous Fraction ◽  
Amorphous Fraction ◽  
Sio2 Nanocomposites ◽  
Rigid Amorphous

Physical Aging and Glass Transition of the Rigid Amorphous Fraction in Poly(l-lactic acid)

2020 ◽  
Vol 53 (20) ◽  
pp. 8741-8750 ◽  
Author(s):  
Xavier Monnier ◽  
Dario Cavallo ◽  
Maria Cristina Righetti ◽  
Maria Laura Di Lorenzo ◽  
Sara Marina ◽  
...  
Keyword(s):  
Lactic Acid ◽  
Glass Transition ◽  
Physical Aging ◽  
Rigid Amorphous Fraction ◽  
Amorphous Fraction ◽  
Rigid Amorphous

Glass transition and aging of the rigid amorphous fraction in polymorphic poly(butene-1)

Polymer ◽  
2021 ◽  
pp. 123830
Author(s):  
Wei Wang ◽  
Seif Eddine Fenni ◽  
Zhe Ma ◽  
Maria Cristina Righetti ◽  
Daniele Cangialosi ◽  
...  
Keyword(s):  
Glass Transition ◽  
Rigid Amorphous Fraction ◽  
Amorphous Fraction ◽  
Rigid Amorphous

scholarly journals Temperature dependence of the rigid amorphous fraction of poly(butylene succinate)

RSC Advances ◽  
2021 ◽  
Vol 11 (41) ◽  
pp. 25731-25737
Author(s):  
Maria Cristina Righetti ◽  
Maria Laura Di Lorenzo ◽  
Patrizia Cinelli ◽  
Massimo Gazzano
Keyword(s):  
Body Temperature ◽  
Temperature Dependence ◽  
Human Body ◽  
Room Temperature ◽  
Rigid Amorphous Fraction ◽  
Butylene Succinate ◽  
Amorphous Fraction ◽  
Human Body Temperature ◽  
Rigid Amorphous

At room temperature and at the human body temperature, all the amorphous fraction is mobile in poly(butylene succinate).

Tailoring the rigid amorphous fraction of isotactic polybutene-1 by ethylene chain defects

Polymer ◽  
2014 ◽  
Vol 55 (23) ◽  
pp. 6132-6139 ◽  
Author(s):  
Maria Laura Di Lorenzo ◽  
René Androsch ◽  
Isabell Stolte
Keyword(s):  
Rigid Amorphous Fraction ◽  
Amorphous Fraction ◽  
Chain Defects ◽  
Rigid Amorphous

Crystallization-induced formation of rigid amorphous fraction

2018 ◽  
Vol 1 (2) ◽  
pp. e10023 ◽  
Author(s):  
Maria Laura Di Lorenzo ◽  
Maria Cristina Righetti
Keyword(s):  
Rigid Amorphous Fraction ◽  
Amorphous Fraction ◽  
Rigid Amorphous

Nanocomposites Based on Hyperbranched Polymers and Montmorillonite

2011 ◽  
Vol 108 ◽  
pp. 91-94 ◽  
Author(s):  
Shao Jian He ◽  
Jun Lin
Keyword(s):  
Heat Capacity ◽  
Glass Transition ◽  
Full Range ◽  
Hyperbranched Polymers ◽  
Xrd Analysis ◽  
Rigid Amorphous Fraction ◽  
Two Phase ◽  
Heat Capacity Jump ◽  
Silicate Layers ◽  
Rigid Amorphous

Nanocomposites based on hyperbranched polymers and sodium montmorillonite were prepared over the full range of compositions. The XRD analysis showed the full exfoliation of silicate layers at lower silicate content (up to 9.1 wt%). With the further increase of silicate loading, an intercalated structure was developed with a constant d-spacing due to the unique structure of hyperbranched polymers. The heat capacity jump at the glass transition of the nanocomposites was found to deviate from the two-phase model prediction, indicating the formation of a rigid amorphous fraction. The glass transition temperature and heat capacity jump behaviors suggested that the molecular mobility of hyperbranched polymers were restricted by the introduction of silicate layers. The mechanical properties of the nanocomposites were also investigated.

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