Effect of different rapeseed-oil-based polyols on mechanical properties of flexible polyurethane foams

2012 ◽  
Vol 125 (4) ◽  
pp. 2936-2945 ◽  
Author(s):  
Piotr Rojek ◽  
Aleksander Prociak
Keyword(s):  
Mechanical Properties ◽  
Rapeseed Oil ◽  
Polyurethane Foams ◽  
Flexible Polyurethane

Effect of multi-walled carbon nanotubes with different diameters on morphology and thermal and mechanical properties of flexible polyurethane foams

2021 ◽  
pp. 026248932110172
Author(s):  
Fukai Yang ◽  
Miao Xie ◽  
Zhang Yudi ◽  
Xinyu Xu
Keyword(s):  
Mechanical Properties ◽  
Carbon Nanotubes ◽  
In Situ Polymerization ◽  
Loss Modulus ◽  
Polyurethane Foams ◽  
The Matrix ◽  
Multi Walled Carbon Nanotubes ◽  
Different Diameters ◽  
Flexible Polyurethane ◽  
Walled Carbon Nanotubes

We report flexible polyurethane foams (PUFs) containing –OH functionalized multi-walled carbon nanotubes (MWCNTs) with different diameters (10–20 nm, 20–30 nm, >50 nm) from 0.1–0.6 wt% (per 100 resins of polyol by weight) prepared via in situ polymerization. After synthesis, the morphology of the MWCNT/PUF composites was observed through scanning electron microscopy (SEM) based on MWCNT amount. The MWCNTs acted as nucleating agents and increased the matrix viscosity. The pore size of the composites decreased and the number of pores increased with increasing MWCNT concentration. Dynamic mechanical analysis (DMA) showed that the storage modulus of the composites increased, the loss modulus decreased, and the Tg gradually decreased with increasing MWCNT content. The incorporation of MWCNTs induced remarkable thermal stabilization of the matrix. The increase in the degradation temperature from 294°C to 304°C resulted in a 50% weight loss. The mechanical properties of the MWCNT/PUF materials increased with increasing MWCNT proportion because of the excellent compatibility and strong interface interaction between the MWCNT and flexible PUF.

Structural and mechanical properties of flexible polyurethane foams cured under pressure

2011 ◽  
Vol 48 (1) ◽  
pp. 53-69 ◽  
Author(s):  
Markus Rampf ◽  
Olga Speck ◽  
Thomas Speck ◽  
Rolf H Luchsinger
Keyword(s):  
Mechanical Properties ◽  
Polyurethane Foams ◽  
Flexible Polyurethane

The effect of various rapeseed oil-based polyols on selected properties of flexible polyurethane foams

Polimery ◽  
2016 ◽  
Vol 61 (11/12) ◽  
pp. 799-806 ◽  
Author(s):  
Elzbieta Malewska ◽  
Szymon Bak ◽  
Maria Kuranska ◽  
Aleksander Prociak
Keyword(s):  
Rapeseed Oil ◽  
Polyurethane Foams ◽  
Flexible Polyurethane

scholarly journals Chemically Functionalized Cellulose Nanocrystals as Reactive Filler in Bio-Based Polyurethane Foams

Polymers ◽  
2021 ◽  
Vol 13 (15) ◽  
pp. 2556
Author(s):  
Francesca Coccia ◽  
Liudmyla Gryshchuk ◽  
Pierluigi Moimare ◽  
Ferdinando de Luca Bossa ◽  
Chiara Santillo ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Cellulose Nanocrystals ◽  
Aqueous Media ◽  
Polyurethane Foams ◽  
Coupling Agents ◽  
Ftir Analysis ◽  
Thermal And Mechanical Properties ◽  
Efficient Coupling ◽  
Flexible Polyurethane ◽  
Pu Foams

Cellulose Nanocrystals, CNC, opportunely functionalized are proposed as reactive fillers in bio-based flexible polyurethane foams to improve, mainly, their mechanical properties. To overcome the cellulose hydrophilicity, CNC was functionalized on its surface by linking covalently a suitable bio-based polyol to obtain a grafted-CNC. The polyols grafted with CNC will react with the isocyanate in the preparation of the polyurethane foams. An attractive way to introduce functionalities on cellulose surfaces in aqueous media is silane chemistry by using functional trialkoxy silanes, X-Si (OR)3. Here, we report the synthesis of CNC-grafted-biopolyol to be used as a successful reactive filler in bio-based polyurethane foams, PUFs. The alkyl silanes were used as efficient coupling agents for the grafting of CNC and bio-polyols. Four strategies to obtain CNC-grafted-polyol were fine-tuned to use CNC as an active filler in PUFs. The effective grafting of the bio polyol on CNC was evaluated by FTIR analysis, and the amount of grafted polyol by thermogravimetric analysis. Finally, the morphological, thermal and mechanical properties and hydrophobicity of filled PUFs were thoughtfully assessed as well as the structure of the foams and, in particular, of the edges and walls of the cell foams by means of the Gibson–Ashby model. Improved thermal stability and mechanical properties of PU foams containing CNC-functionalized-polyol are observed. The morphology of the PU foams is also influenced by the functionalization of the CNC.

scholarly journals Synthesis, Characterization and Mechanical Properties of Novel Bio-Based Polyurethane Foams Using Cellulose-Derived Polyol for Chain Extension and Cellulose Citrate as a Thickener Additive

Polymers ◽  
2021 ◽  
Vol 13 (16) ◽  
pp. 2802
Author(s):  
Loredana Maiuolo ◽  
Fabrizio Olivito ◽  
Vincenzo Algieri ◽  
Paola Costanzo ◽  
Antonio Jiritano ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Mechanical Tests ◽  
Reduction Reaction ◽  
Polyurethane Foams ◽  
Chain Extension ◽  
Polyurethane Composite ◽  
Composite Foams ◽  
Bio Oil ◽  
Ft Ir ◽  
Flexible Polyurethane

A novel series of bio-based polyurethane composite foams was prepared, employing a cellulose-derived polyol for chain extension and cellulose-citrate as a thickener additive. The utilized polyol was obtained from the reduction reaction of cellulose-derived bio-oil through the use of sodium borohydride and iodine. Primarily, we produced both rigid and flexible polyurethane foams through chain extension of the prepolymers. Secondly, we investigated the role of cellulose citrate as a polyurethane additive to improve the mechanical properties of the realized composite materials. The products were characterized by FT-IR spectroscopy and their morphologies were analysed by SEM. Mechanical tests were evaluated to open new perspectives towards different applications.

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