We report an atom-efficient approach to the preparation of sustainable polyesters and their corresponding thermosetting resins (RESINs) from renewable plant oils.
In this study, we will report on
the synthesis and application of efficient botanical agrochemicals
from turpentine for sustainable crop protection. Two series of turpentine
derived secondary amines were synthesized and identified by FT-IR, 1H NMR, 13C NMR, and HRMS. The herbicidal activities
against Echinochloa crus-galli were
evaluated. The potential toxicity of the synthesized compounds was
tested by MTT cytotoxicity analysis. The effect of structure of the
synthesized secondary amines and corresponding Schiff base compounds
on their activities was investigated by quantitative structure–activity
relationship (QSAR) study. All target products were found to be low
toxicity, with similar or higher herbicidal activities than commercial
herbicides diuron and Glyphosate. Results of QSAR study showed that
a best four-descriptor QSAR model with R
2 of 0.880 and R
loo
2 of 0.818
was obtained. The four descriptors most relevant to the herbicidal
activities are the min valency of a N atom, the max total interaction for a C−H bond, the relative number of aromatic bonds, and the min
partial charge (Q
min
).
Rosin is an important forestry resource with a specific three-membered phenanthrene ring structure, which can improve the mechanical resistance of polymer coatings. In this paper, a high purity rosin monomer, tri-allyl maleopimarate containing three allyl groups has been synthesized. The yield of the monomer product was 93.2% with the purity of 96.1%. The structure of the synthesized monomer was characterized through gas chromatography (GC), mass spectrometry (MS), hydrogen nuclear magnetic resonance spectroscopy (1H NMR), carbon nuclear magnetic resonance spectroscopy (13C NMR) and elemental analysis. Additionally, we present new experimental results regarding the polymerization reaction under ultraviolet (UV) irradiation. The cured film of tri-allyl maleopimarate exhibited good mechanical properties. The films were also characterized through thermogravimetric (TG) and differential scanning calorimetry (DSC) analyses and a mechanism for polymerization was proposed. Overall, a facile catalytic process for the valorization of rosin in the field of UV polymerization is reported.
A novel, sustainable, rosin-based quaternary ammonium salt, dehydroabietyltrimethyl ammonium bromine, has been applied for the synthesis of ordered hexagonal supermicroporous silica with nanosheet morphology. Unlike the conventional short chain surfactants, rosin-based surfactant possesses a rigid group of a three-ring phenanthrene skeleton. Such a hydrophobic group gives the surfactant a large total volume and small effective headgroup area, which are beneficial for the formation of 2D hexagonal phase. XRD, N 2 adsorption-desorption, TEM, and SEM are used to characterize the samples. The results indicate that the molar ratios of mixture of silicate source, template agent and inorganic acid in the synthesis system have great effects on the regularity of the pore structure. The synthesized material possesses large surface area (1229 m 2 g À1 ), high pore volume (0.59 cm 3 g À1 ) and narrow pore size distribution (centered at about 2.03 nm), which is on the borderline between the micropore and mesopore regions. Such a material will be attractive for applications in separations and catalysis because of its potential shape and size selectivities.
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