Results 1 to 10 of about 179,059 (207)

Selective Degradation of Polyurethanes in Mixed Plastic Wastes via Ir-Catalyzed Hydrogenolysis. [PDF]

Angew Chem Int Ed Engl
The selective degradation of polyurethanes in mixed plastic wastes with polyesters and polyamides was achieved using H2 as a reactant, enabling simultaneous recovery of diformamides and polyols arising from polyurethanes and separation of polyesters and polyamides without any degradation.
Yamada Y, Iwasaki T, Tanaka S, Nozaki K.
europepmc   +3 more sources

Microstructural Changes of Aramid Fiber Due to Reaction with Toluene 2,4-diisocyanate under Tension in scCO₂. [PDF]

Polymers (Basel), 2019
High modulus aramid fiber, such as Kevlar 49, is conventionally prepared by the heat annealing of high strength aramid fiber under a suitable tension at high temperature, especially higher than 500 °C. This enables the mobility of a rigid molecule chain to be rearranged into a more perfect crystalline or orientation structure under tension.
Kong H, Xu Q, Yu M.
europepmc   +4 more sources

Polyurethane Depolymerization With Alkyl, Aryl, and Mixed Carbonates. [PDF]

ChemSusChem
The depolymerization of polyurethane foams strongly depends on carbonate structure. Aryl carbonates improve hard‐segment solubility but generate side products. Alkyl carbonates give cleaner products yet suffer from limited hard‐block solubility and require anisole as a cosolvent. Mixed carbonate systems balance these effects, improving solubility while
Hosgor E, Martinho RP, Verboom W, Lange JP, Huskens J.   +4 more
europepmc   +2 more sources

Increased mutagenicity in the liver of MutaMouse females following oral treatment with commercial-grade toluene diisocyanate [PDF]

Genes and Environment
Background Toluene diisocyanates (TDIs) are high-production-volume chemicals widely used in polyurethane manufacturing. A typical commercial-grade TDI (TDI; 2,4-toluene diisocyanate: 2,6-toluene diisocyanate; 80:20), CAS: 26471-62-5, is mutagenic in ...
Mariko Matsumoto, Masakatsu Natsume, Takako Iso, Takaaki Umano, Yasumasa Murata, Kenichi Masumura, Katsuyoshi Horibata, Kei-ichi Sugiyama   +7 more
doaj   +2 more sources

Patch Testing in Individuals With Diabetes Using Medical Devices. Part 2-Contact Allergy to Medical Device Allergens and New Patch Test Recommendations. [PDF]

Contact Dermatitis
This study aimed to describe the prevalence of contact allergy to allergens found in diabetes medical devices (MDs) among diabetes MD users and suggest an updated MD patch test series. Of the 204 diabetes MD users (114 with skin rash to diabetes MDs and 90 without), 16.2% were positive to allergens found in diabetes MDs, which underlines the urgent ...
Ulriksdotter J, Mowitz M, Sukakul T, Bruze M, Hamnerius N, Svedman C.   +5 more
europepmc   +2 more sources

Identification and validation of genes encoding humoral specificity for the chemical allergen toluene diisocyanate. [PDF]

PLoS ONE
A panel of hybridomas specific for different isomers of toluene diisocyanate (TDI), a cross‑linking chemical used in polyurethane production, has been previously described.
Adam V Wisnewski, Jian Liu
doaj   +2 more sources

Environmental Identification of Novel Enzymes for Polyurethane and Polyamide Degradation. [PDF]

Angew Chem Int Ed Engl
Heteroatom‐containing plastics such as polyurethanes and nylons are produced at scale yet remain largely unrecycled. Biocatalysts offer a promising route to depolymerization under mild conditions. Here, we present a screening platform for the discovery of novel polyurethane‐ and nylon‐degrading enzymes from environmental samples and demonstrate ...
Bendtsen MK, Møllebjerg A, Peña-Díaz S, Graham R, Petersen NC, Isaksen BN, Carstensen M, Johansen MB, Sommerfeldt A, Petersen AR, Chuma IK, Ryberg C, Wittenborn TR, Gichuru V, Wang H, Scavenius C, Sandahl A, Otzen DE.   +17 more
europepmc   +3 more sources

Kujin Suppresses Histamine Signaling at the Transcriptional Level in Toluene 2,4-Diisocyanate–Sensitized Rats

Journal of Pharmacological Sciences, 2009
Kujin, the dried root of Sophorae flavescensis, has been used in Chinese folklore medicine against allergy. Evaluation of its anti-allergic potential as well as its mechanism of action has rarely been established.
Shrabanti Dev, Hiroyuki Mizuguchi, Asish K. Das, Kazutaka Maeyama, Shiho Horinaga, Shuhei Kato, Misaki Tamada, Masashi Hattori, Hayato Umehara, Hiroyuki Fukui   +9 more
doaj   +4 more sources

Delayed Type Allergic Itch-Associated Response Induced by Toluene-2,4-diisocyanate in Hairless Mice

Journal of Pharmacological Sciences, 2003
: To develop an allergic dermatitis model showing persistent scratching in mice, toluene-2,4-diisocyanate (TDI) was repeatedly painted onto the skin of hairless HR-1 mice, and induction of itch-associated scratching behavior was observed.
Kazuhiro Fuchibe, Takeshi Nabe, Masanori Fujii, Nobuaki Mizutani, Kiichiro Danno, Akihide Koda, Shigekatsu Kohno   +6 more
doaj   +4 more sources

Recycling of Polyurethane Waste: Facile Hydrothermal Conversion Using Acidic and Basic Additives. [PDF]

ChemSusChem
Ethylenediamine efficiently catalyses the hydrothermal recycling of polyurethane (PU) into monomers. The NH functional groups promote carbamic acid decomposition via zwitterion interactions, outperforming inorganic acids and bases, and enabling selective depolymerisation of PU under mild conditions for circular chemical utilisation.
Wang H, Gupta H, Shiju NR.
europepmc   +2 more sources