Ferromagnetic charge transfer salts based on metal-phthalocyanines and alkali metals

Sharoyan, É. G.; Simonyan, Mkhital; Sharoyan, V.E.

doi:10.1016/0379-6779(91)91286-j

Cited by 1 publication

(1 citation statement)

References 0 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Birch bark is a byproduct obtained from the forest industry. Birch bark suffers from problems such as deposition during the papermaking process and is, therefore, often wasted as a low-grade fuel. So, betulin is undoubtedly an underutilized natural resource.…”

Section: Introductionmentioning

confidence: 99%

Catalyst-Free Synthesis of Betulin-Based Polyurethane Elastomers with Outstanding Mechanical Properties and Solvent Resistance

Xu,

Ma,

Wang

et al. 2023

ACS Appl. Polym. Mater.

View full text Add to dashboard Cite

Using sustainable biomass feedstock to prepare biobased chemical products is attracting increasing attention. Betulin is a natural cyclic aliphatic diol that can be extracted in large quantities from the bark of birch trees. In this study, a series of biobased polyurethane (PU) elastomers with excellent mechanical properties, solvent resistance, and thermal stability were synthesized under catalyst-free conditions using betulin and castor oil (CO) as the bio-based polyols. The chemical structure and properties of the bio-based PU elastomers were systematically investigated according to the effect of the hydroxyl ratio between betulin and CO. Due to the presence of abundant hydrogen bonds and rigid ring planes in the PU structure, and a higher cross-link density, the obtained PU elastomers had excellent mechanical properties. They achieved a maximum tensile strength of 31.6 MPa with the tensile strain reaching more than 200% and were able to withstand 1 × 10 5 times their weight. The thermal decomposition temperature of the betulin-derived PUs was over 300 °C. This study showcased a strategy to synthesize sustainable high-performance PU materials with a high biomass content (>75%).

show abstract

Section: Introductionmentioning

confidence: 99%