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Showing 1-30 of 33 results for "256439" within Papers
Cytotoxicity and mechanical behavior of chitin-bentonite clay based polyurethane bio-nanocomposites.
Khalid Mahmood Zia et al.
International journal of biological macromolecules, 49(5), 1131-1136 (2011-09-29)
Chitin based polyurethane bio-nanocomposites (PUBNC) were prepared using chitin, Delite HPS bentonite nanoclay enriched in montmorillonite (MMT), 4,4'-diphenylmethane diisocyanate (MDI) and polycaprolactone polyol CAPA 231 (3000 g/mol(-1)). The prepolymers having different concentration of Delite HPS bentonite nanoclay were extended with
Journal of Applied Physiology, 70, 6983-6983 (1991)
Adam V Wisnewski et al.
Analytical biochemistry, 400(2), 251-258 (2010-02-04)
Diphenylmethane diisocyanate (MDI), the chemical commonly used as a cross-linking agent in commercial polyurethane production, is a well-recognized cause of asthma. Reaction products between MDI and "self" proteins are hypothesized to act as antigens capable of inducing airway inflammation and
Gabriele Sabbioni et al.
Chemical research in toxicology, 25(12), 2704-2714 (2012-11-28)
4,4'-Methylenediphenyl diisocyanate (MDI) is the most important isocyanate used in the chemical industry. Lung sensitization and asthma are the main types of damage after exposure to MDI. Albumin adducts of MDI might be involved in the etiology of sensitization reactions.
Xianwu Zou et al.
Bioresource technology, 114, 654-657 (2012-04-14)
The aim of the present study was to determine whether polyurethane (PU) foams can be prepared from heavy oil derived from biomass liquefaction. Since the hydroxyl number of the heavy oil was only 212 mg KOH/g, it was modified by
Hille Suojalehto et al.
American journal of industrial medicine, 54(12), 906-910 (2011-10-12)
Orthopedic plaster casts contain methylene diphenyl diisocyanate (MDI). A few case reports have suggested occupational asthma to MDI in casting work. However, the knowledge of the exposure levels related to the occupational asthma cases is lacking. We report on two
Jürgen Pauluhn
Regulatory toxicology and pharmacology : RTP, 61(3), 351-364 (2011-10-22)
Polymeric methylenediphenyl diisocyanate (MDI) is a high production volume chemical intermediate consisting of monomeric 4,4'-MDI, its 2,2'- and 2,4'-isomers, and higher oligomeric homologues. The toxicity of pMDI has systematically been investigated in previous regulatory and mechanistic studies. One cornerstone of
Kristiina Aalto-Korte et al.
Contact dermatitis, 67(2), 78-88 (2012-03-21)
The monomeric isocyanates diphenylmethane diisocyanate (MDI), 2,4-toluene diisocyanate (TDI), isophorone diisocyanate (IPDI) and 1,6-hexamethylene diisocyanate (HDI) are used in polyurethane products and sometimes cause contact allergy. To describe patients with isocyanate contact allergy in an occupational dermatology clinic. Test files
E Vangronsveld et al.
International journal of hygiene and environmental health, 213(6), 475-488 (2010-09-21)
It is well known that the use of MDI (methylene diphenyldiisocyanate) as an alternative for formaldehyde-based resins is seen as a responsible option to reduce formaldehyde emissions for CWP (Composite Wood Products) in buildings. However, there are concerns raised regarding
X Baur
Pneumologie (Stuttgart, Germany), 65(6), 340-346 (2010-12-15)
This is an updated overview of indications, contraindications, performance and interpretation of bronchial challenge tests. As speciality, the diagnostic step by step scheme comprises in addition to the clinical case history a detailed exposure (occupational) history, lung function testing, assessment
Anoop Kumar et al.
Chemical research in toxicology, 22(12), 1975-1983 (2009-11-26)
4,4'-Methylenediphenyl diisocyanate (MDI) is the most important of the isocyanates used as intermediates in the chemical industry. Among the main types of damage after exposure to low levels of MDI are lung sensitization and asthma. Albumin adducts of MDI might
Maj-Len Henriks-Eckerman et al.
Toxicology letters, 232(3), 595-600 (2014-12-30)
The causal relationship between inhalation exposure to methylenediphenyl diisocyanate (MDI) and the risk of occupational asthma is well known, but the role of dermal exposure and dermal uptake of MDI in this process is still unclear. The aims of this
Taeyi Choi et al.
Journal of biomaterials science. Polymer edition, 22(7), 973-980 (2010-12-15)
Novel hard-block-only polyurethanes are prepared from 1,4-butanediol (BDO) and a pre-polymer synthesized separately from 1,3-bis (4-hydroxybutyl) tetramethyl disiloxane (BHTD) and 4,4'-diphenylmethane diisocyanate (MDI). Three (co)polymers using different proportions of these chain extenders were synthesized using reaction injection moulding, and their
Polyurethane cationomers synthesised with 4, 4?-methylenebis (phenyl isocyanate), polyoxyethylene glycol and N-methyl diethanolamine
Piotr Krol, et al.
Colloid and Polymer Science, 286, 1111-1122 (2008)
Cuili Zhang et al.
Journal of molecular modeling, 16(8), 1391-1399 (2010-02-16)
Hydrogen bonding among hard-hard segments and hard-soft segments in 4,4'-diphenylmethane diisocyanate (MDI)-based polyurethane was investigated theoretically by density functional theory (DFT). Both B3LYP/6-31G* and B3PW91/6-31G* methods gave good structures, reasonable Mulliken charges, binding energies, dipole moments, and good infrared (IR)
H D Hoffmann et al.
Toxicology letters, 199(3), 364-371 (2010-10-12)
Polyurethanes (PU) are polymers made with diisocyanates such as MDI (4,4'-methylene diphenyl diisocyanate) and TDI (2,4-toluene diisocyanate and 2,6-toluene diisocyanate). Investigations have been undertaken with MDI and TDI to assess dermal uptake and resulting systemic exposure. Absorption, distribution and excretion
Angela R Lemons et al.
Journal of immunological methods, 397(1-2), 66-70 (2013-09-10)
Diisocyanates (dNCOs) are highly reactive low molecular weight chemicals commonly used in the manufacturing industry. Occupational exposures to dNCOs have been shown to elicit allergic sensitization and occupational asthma. Among the most commonly used dNCOs in industry are the aromatic
Mitchell R Ladd et al.
Tissue engineering. Part A, 25(17-18), 1225-1241 (2019-01-18)
This study is significant because it demonstrates an attempt to design a scaffold specifically for small intestine using a novel fabrication method, resulting in an architecture that resembles intestinal villi. In addition, we use the versatile polymer poly(glycerol sebacate) (PGS)
Unique foreign body ingestions in the pediatric population.
Sheila Isabelle Goertemoeller et al.
Journal of emergency nursing: JEN : official publication of the Emergency Department Nurses Association, 36(2), 178-179 (2010-03-10)
Jyun-Yan Ye et al.
Materials (Basel, Switzerland), 14(4) (2021-02-11)
A series of N-substituted polyether-block-amide (PEBA-X%) copolymers were prepared by melt polycondensation of nylon-6 prepolymer and polytetramethylene ether glycol at an elevated temperature using titanium isopropoxide as a catalyst. The structure, thermal properties, and crystallinity of PEBA-X% were investigated using
Anning Wang et al.
International journal of pharmaceutics, 441(1-2), 30-39 (2012-12-25)
A series of temperature- and pH-responsive polyurethanes based on hexamethylene diisocyanate (HDI) and 4,4'-diphenylmethane diisocyanate (MDI) were synthesized by a coupling reaction with bis-1,4-(hydroxyethyl) piperazine (HEP), N-methyldiethanolamine (MDEA) and N-butyldiethanolamine (BDEA), respectively. The chemical structure, molecular weight, thermal property and
Hanna K Lindberg et al.
Mutation research, 723(1), 1-10 (2011-04-02)
Toluene diisocyanate (TDI) and 4,4'-methylenediphenyl diisocyanate (MDI), used in the production of polyurethane foam, are well known for their irritating and sensitizing properties. Contradictory results have been obtained on their genotoxicity. We investigated the genotoxicity and protein binding of inhaled
Adam V Wisnewski et al.
Chemico-biological interactions, 205(1), 38-45 (2013-06-25)
Methylene diphenyl diisocyanate (MDI) is among the leading chemical causes of occupational asthma world-wide, however, the mechanisms of disease pathogenesis remain unclear. This study tests the hypothesis that glutathione (GSH) reacts with MDI to form quasi-stable conjugates, capable of mediating
Berran Yucesoy et al.
Toxicological sciences : an official journal of the Society of Toxicology, 129(1), 166-173 (2012-05-23)
Diisocyanates are a common cause of occupational asthma, but risk factors are not well defined. A case-control study was conducted to investigate whether genetic variants of antioxidant defense genes, glutathione S-transferases (GSTM1, GSTT1, GSTM3, GSTP1), manganese superoxide dismutase (SOD2), and
Dominika Swierczyńska-Machura et al.
Medycyna pracy, 62(6), 567-577 (2012-02-09)
The aim of the study was to analyze the data obtained during the diagnostic process and their real values in the final diagnosis of patients exposed to diisocyanates amd suspected of occupational allergic disease of the respiratory system The patients
Malin Engfeldt et al.
Contact dermatitis, 68(2), 98-102 (2012-08-30)
Two outbreaks of allergic contact dermatitis caused by isocyanates at two companies in southern Sweden initiated a research project focusing on contact allergy to isocyanates. Within the project, there was an interest in determining how often contact allergy to the
Preparation and Characterization of Isosorbide-Based Self-Healable Polyurethane Elastomers with Thermally Reversible Bonds
Han-Na Kim, et al.
Molecules (Basel), 24 (2019)
Gabriele Sabbioni et al.
Biomarkers : biochemical indicators of exposure, response, and susceptibility to chemicals, 15(6), 508-515 (2010-06-18)
4,4'-Methylenediphenyl diisocyanate (MDI) is the most important of the isocyanates used as intermediates in the chemical industry. Among the main types of damage after exposure to low levels of MDI are lung sensitization and asthma. Albumin adducts of MDI might
A comparison of two sampling methods for the detection of airborne methylene bisphenyl diisocyanate.
Joshua W Schaeffer et al.
Journal of occupational and environmental hygiene, 10(4), 213-221 (2013-02-28)
The purpose of this study was to determine if there was a significant difference between two readily available sampling methodologies for airborne methylene bisphenyl diisocyanate (MDI), which is an essential precursor in the spray-on truck bed lining industry. Seventy-two personal
Haneen Hamada et al.
Contact dermatitis, 66(2), 101-105 (2011-11-19)
To investigate the dermal uptake of 4,4'-diphenylmethane diisocyanate (4,4'-MDI), a study was performed in which 2 female volunteers were exposed to 10 and 25 mg, respectively, of 4,4'-MDI by applying 2.0% 4,4'-MDI in petrolatum over areas where the surface concentration
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