Recent Developments in Polyurethane Catalysis: Catalytic Mechanisms Review

Silva, Ana L.; Bordado, João

doi:10.1081/cr-120027049

Cited by 162 publications

(108 citation statements)

References 29 publications

Supporting

Mentioning

106

Contrasting

Unclassified

Order By: Relevance

“…These polymers are produced by the reaction of polyisocyanate with polyoils and water in the presence of specific catalyst [29]. Through this reactional synthesis, a very versatile material is obtained, whose degree of rigidity depends on the desired application [29], making this type of material a very attractive polymeric phase for SBSE, as it has been demonstrated by Neng et al [34] and Fatima et al [35][36][37].…”

Section: Polyurethane Foams (Pufs)mentioning

confidence: 99%

“…Polyurethane foams (PUFs) are polymers with a wide variety of applications [28][29][30], which have been described to have a high capacity to retain organic vapors in their open cell structure [31][32][33]. These polymers are produced by the reaction of polyisocyanate with polyoils and water in the presence of specific catalyst [29].…”

Section: Polyurethane Foams (Pufs)mentioning

confidence: 99%

See 1 more Smart Citation

Advances in stir bar sorptive extraction coating: A review

Rykowska¹,

Wasiak²

2013

Acta Chromatographica

View full text Add to dashboard Cite

Summary. Stir bar sorptive extraction (SBSE) is an extraction technique for enrichment of organic compounds from aqueous and gaseous matrices. This technique is based on sorptive extraction, whereby the solutes are extracted into a polymer coating on magnetic stirring rod. SBSE has been used in various types of analytical procedures and wide variety of matrices. However, a limitation of SBSE lies in the fact that only polydimethylsiloxane (PDMS)-coating material is commercially available and that PDMS predominantly extracts non-polar compounds with K o/w higher than 10. In this survey, a review on non-PDMS stir bar sorptive extraction coatings and their applications to the analysis of environmental, food, and biomedical samples is given.

show abstract

Section: Polyurethane Foams (Pufs)mentioning

confidence: 99%

Section: Polyurethane Foams (Pufs)mentioning

confidence: 99%

Advances in stir bar sorptive extraction coating: A review

Rykowska¹,

Wasiak²

2013

Acta Chromatographica

View full text Add to dashboard Cite

show abstract

“…Organometallic catalysts are applied for their strong gelation activity. A more detailed discussion on catalysts may be found in reviews on PU catalysis [16][17][18]. Many other additives may be used in a reaction mixture, depending on the targeted application.…”

Section: Synthesis and Characteristics Of Polyurethanementioning

confidence: 99%

“…Catalysts used in PUs are often divided in to organic base catalysts and organometallic catalysts [16]. Organic base catalysts are further divided into delayed action catalysts and reactive catalysts.…”

Section: Synthesis and Characteristics Of Polyurethanementioning

confidence: 99%

A Novel Approach for the Utilization of Biocellulose Nanofibres in Polyurethane Nanocomposites for Potential Applications in Bone Tissue Implants

Khan

Dahman

2012

Designed Monomers and Polymers

View full text Add to dashboard Cite

With the increasing number of surgical bone grafts per year, the application of biomaterials in tissue engineering has become a popular issue. In the present work, the potential of biocellulose-nanofibre-reinforced polyurethane nanocomposites to act as bone scaffold implants is established. Investigating properties of polyurethane shows that this widely applied biomaterial group cannot fulfil all properties required for bone implants in a stand-alone fashion. Bone implants require a high Young's modulus and tensile strength but low strain which makes it difficult to find a suitable polyurethane since higher hard segment content will reduce tensile strength and lower hard segment content will reduce the Young's modulus. Other factors such as biodegradation also become important. A literature review on carbon nanotube and nanofibre composites with polyurethanes shows that nanofibrous reinforcement leads to favourable implant properties. Young's modulus and tensile strength increase dramatically. Other properties such as thermal conductivity and viscosity are also affected. These types of nanofibrous materials, however, are the subject of an ongoing debate about toxicity and their use in bone implants is questionable. Biocellulose nanofibres formed from bacteria (also called bacterial cellulose (BC)) possess favourable mechanical properties and are highly biocompatible. A survey on works done on BC nanofibres and their composites show that nanostructured biocomposites that contains the nanofibres reinforced in polymer composites result in changes that are comparable to those of carbon nanotubes in regards to bone scaffold applications. Showing improvement on biocompatibility and mechanical properties, biocellulose nanofibre reinforcement on polyurethanes possesses strong potential for bone implants and other tissue-engineering applications.

show abstract

“…Of the many metals available, tin compounds are the most widely used, these compounds act as lewis acids and are generally thought to function by interacting with basic sites in the isocyanate and polyol compounds as shown in Figure 2 [11].…”

Section: Introductionmentioning

confidence: 99%

The Influence of Polyurethane Foam on the Insulation Characteristics of Mortar Pastes

Mahmoud¹,

Nasr²,

Maamoun³

2017

JMMCE

View full text Add to dashboard Cite

Rigid polyurethane foam is found virtually everywhere in our modern world and is used in sound and thermal insulation applications such as refrigerators, insulated buildings, thermosets. Organometallic compounds are used as polyurethane catalysts since they are very highly selective towards the isocyanate-polyol reaction. Also, amine catalysts are used to balance both the gelling reaction and the gas-forming or foaming reaction responsible for foam formation. In this work, the effect of a tin octoate catalyst on the mechanical properties and morphology of polyurethane foam were investigated. Also, the thermal conductivity and sound absorption coefficient for polyurethane foam mortar formulations were measured. The morphological properties of polyurethane foam were investigated using scanning electron microscope to determine the influence of varying the concentration of tin octoate. It was clear from the results that polyurethane foam has good thermal and sound insulation capabilities.

show abstract

Recent Developments in Polyurethane Catalysis: Catalytic Mechanisms Review

Cited by 162 publications

References 29 publications

Advances in stir bar sorptive extraction coating: A review

Advances in stir bar sorptive extraction coating: A review

A Novel Approach for the Utilization of Biocellulose Nanofibres in Polyurethane Nanocomposites for Potential Applications in Bone Tissue Implants

The Influence of Polyurethane Foam on the Insulation Characteristics of Mortar Pastes

Contact Info

Product

Resources

About