From polyurethane foam stabilization to amphiphilic particles — An example of industrial R&D in colloid chemistry

2008 ◽  
pp. 17-26 ◽  
Author(s):  
G. Rossmy
Keyword(s):  
Polyurethane Foam ◽  
Colloid Chemistry ◽  
Foam Stabilization ◽  
Amphiphilic Particles

scholarly journals COMPRESSIBLITY OF PEAT SOIL IMPROVED WITH POLYURETHANE

2019 ◽  
Vol 31 (1) ◽  
Author(s):  
Ismacahyadi Bagus Mohamed Jais ◽  
Diana Che Lat ◽  
Tengku Nur Dalila Tengku Endut
Keyword(s):  
Polyurethane Foam ◽  
Peat Soil ◽  
Optimum Ratio ◽  
Overburden Pressure ◽  
Lightweight Material ◽  
Oedometer Test ◽  
Pu Foam ◽  
Foam Stabilization ◽  
Underlying Soil ◽  
Very High

This research investigated the compressibility of natural peat soil and peat soil improved with polyurethane foam. High natural moisture content, high compressibility, low bearing capacity and medium to low permeability is a problem and characteristic of a peat soil. This problem can be solved by reducing the compressibility of the peat soil. The objective of this study is mainly to prove whether the presence of polyurethane foam as a lightweight material on peat soil can reduce the compressibility of peat soil or otherwise. Fifteen samples of peat soil taken from Johan Setia, Klang were tested using Oedometer test with load is doubled at each increment until it reaches the maximum required load which is 10kPa, 20kPa, 40kPa, 80kPa, 160kPa, 320kPa and 640kPa. Polyurethane foam is a lightweight material, therefore reduces the overburden pressure to the underlying soil, hence future settlement can be minimized to a tolerable settlement value. Based on the data obtained from analysis of Oedometer test, the compressibility parameters including void ratio, compression index and swelling index of the peat soil alone are very high which denoted extremely poor condition of the peat soil. The compressibility parameters improved significantly with the PU foam stabilization as PU act as a void filler for peat soil. A slight increase in the compressibility parameters are recorded with higher ratio of isocyanate.  However, the maximum pre-consolidation pressure recorded was with PU ratio of 1:1. Therefore, the optimum ratio for PU peat stabilization is in the ratio of 1:1.

Actual procedures of diagnostics and treatments of crural venous ulcer in specialized German praxis and clinics

Phlebologie ◽  
2009 ◽  
Vol 38 (02) ◽  
pp. 77-82 ◽  
Author(s):  
P. Altmeyer ◽  
M. Stücker ◽  
S. Reich-Schupke
Keyword(s):  
Annual Meeting ◽  
Polyurethane Foam ◽  
Surgical Therapy ◽  
Compression Therapy ◽  
German Society ◽  
Venous Ulcer ◽  
Ulcus Cruris ◽  
Wound Dressings

Summary Background: To evaluate the implementation of the guidelines of the German Society of Phlebology for venous crural ulcer a survey was conducted during the annual meeting of the German Society of Phlebology 2008 in Bochum. Methods: All 719 medical participants got an anonymized questionnaire asking for supply of crural ulcer in their institution. Results: The recurrent 66 questionnaires (9.2%) were filled by colleagues from practice or hospital, mostly surgeons, dermatologists, phlebologists and vascular surgeons. As basic diagnostics vein doppler (56.1%), duplex (75.8%) or measurement of brachial-ankleindex (83.3%) were performed. Compression therapy is used in all institutions. Mainly used wound dressings are polyurethane foam dressings, alginates, hydrocolloids and silver dressings. About 2/3 conduct surgical therapy of ulcers. Conclusion: Supply of ulcus cruris by the participants of the annual meeting of the DGP corresponds mainly, but not in all aspects to the guidelines. Further efforts for a spread of the guidelines are necessary.

Interfacial interactions of polyurethane foam systems with inorganic fillers

2016 ◽  
Vol 2 (2) ◽  
pp. 49-53
Author(s):  
M. A. Ksenofontov ◽  
L. E. Ostrovskaya ◽  
E. Yu. Bobkova ◽  
V. S. Vasil`eva ◽  
T. G. Pavlukevich
Keyword(s):  
Polyurethane Foam ◽  
Interfacial Interactions ◽  
Inorganic Fillers

The Polyurethane Foam Project for engineering education

1995 ◽  
Author(s):  
Gary Workman ◽  
Sherri Messimer ◽  
Bradley Schroer
Keyword(s):  
Engineering Education ◽  
Polyurethane Foam

Mechanical and Flammability Properties of Green Polyurethane Foam with Alumina Trihydrate as Flame Retardant

2017 ◽  
Author(s):  
Amanda Silva ◽  
Enio Henrique Pires da Silva ◽  
Danilo Janes ◽  
Romeu Rony Cavalcante da Costa ◽  
Giovanna Gabriela Crem Silva
Keyword(s):  
Flame Retardant ◽  
Polyurethane Foam ◽  
Alumina Trihydrate

Doped Bio-Based Polyurethane Foam Tensile Characterization

2019 ◽  
Author(s):  
Enio Henrique Pires da Silva ◽  
Guilherme Waldow ◽  
Saulo Fernandes ◽  
Miguel Felipe Galera da Silva ◽  
Ana Paula de Moura ◽  
...  
Keyword(s):  
Polyurethane Foam ◽  
Tensile Characterization

A greener and sustainable approach for converting polyurethane foam rejects into superior polyurethane coatings

2019 ◽  
Author(s):  
Chem Int
Keyword(s):  
Mechanical Properties ◽  
Polyurethane Foam ◽  
Sebacic Acid ◽  
Polyurethane Foams ◽  
Hexamethylene Diisocyanate ◽  
Alkali Resistance ◽  
Microwave Reaction ◽  
P Recycling ◽  
Amine Groups ◽  
Green Polymer

Recycling is a crucial area of research in green polymer chemistry. Various developments in recycling are driven by Environmental concerns, interest in sustainability and desire to decrease the dependence on non-renewable petroleum based materials. Polyurethane foams [PUF] are widely used due to their light weight and superior heat insulation as well as good mechanical properties. As per survey carried Polyurethane Foam Association, 12 metric tonnes of polyurethane foam are discharged during manufacturing and/or processing and hence recycling of PUF is necessary for better economics and ecological reasons. In present study, rejects of PUF is subjected to reaction with a diethylene amine in presence of sodium hydroxide [NaOH] as catalyst, as a result depolymerised product containing hydroxyl and amine groups is obtained. Conventional and Microwave reaction for depolymerizing polyurethane foam have been carried, and best results are obtained by Microwave reaction. Further depolymerised product with hydroxyl and amine functionalities are reacted with bis (2-hydroxyethyl terephthalate) [BHET] obtained by recycling polyethylene terephthalate [PET] and sebacic acid, with stannous oxalate [FASCAT 2100 series] as catalyst to obtain Polyester amides. These Polyester amides having hydroxyl and amino groups in excess are cured with isocyanates-hexamethylene diisocyanate biuret [HDI biuret] and isophorone diisocyanate [IPDI] for coating applications. The coated films are characterized using physical, mechanical and chemical tests, which shows comparable physical, mechanical properties but alkali resistance is poor.

Sign in / Sign up

Export Citation Format

Share Document