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The Promoting Effect of Multifunctional Groups on the Thermal and Mechanical Properties of PVC Materials

Journal of Renewable Materials 2023年第2期11卷 867-880页

作者： Mei Wang Xinzhu Fan Xianghai Song Quan Bu School of Agricultural Engineering Jiangsu UniversityZhenjiang212013China Institute of the Green Chemistry and Chemical Technology School of Chemistry and Chemical EngineeringJiangsu UniversityZhenjiang212013China

The development of PVC materials grafted with mannich base originated from myrcene(P-MAM-g,where the mannich base derived from myrcene is abbreviated as MAM)via green and effective synthetic methods is a good strategy to avoid unacceptable discoloration and deterioration of thermal and mechanical properties caused by autocatalytic dehydrochlorination(DHC)during PVC *** this study,MAM with double bonds,amino groups,ester groups,and phospholipid groups was introduced into the chains of PVC to improve the thermal stability of *** experimental results showed that the covalent attachment of MAM to PVC enhanced both the initial and the long-term stability of *** enhanced performance of P-MAM-g compared with unmodified PVC is attributed to the simultaneous introduction of double bonds and amino groups into the PVC *** double bonds trapped the unstable chlorine atoms originated from the degradation of the PVC chain and reacted with the labile macromolecular radicals originated from PVC,thus inhibiting the radical degradation of the PVC ***,the amino groups absorbed the HCl produced in the degradation of PVC,inhibiting the adverse effects of HCl.P-MAM-g displayed better intrinsic flexibility and anti-migration ability of organic functional components compared with the control PVC materials.A possible stabilizing mechanism of the P-MAM-g was also presented.

关键词： myrcene poly(vinyl chloride) covalent grafting self-stabilization

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Chemical Compositions of the Leaf Essential Oils of <i>Aralia spinosa</i>from Three Habitats in Northern Alabama

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American Journal of Plant Sciences 2011年第3期2卷 507-510页

作者： Purva C. Davé Bernhard Vogler William N. Setzer 不详

Aralia spinosa leaves were collected from three different habitats in north Alabama. The leaf essential oils were collected by hydrodistillation and analyzed by gas chromatography / mass spectrometry (GC-MS). The most abundant components of A. spinosa essential oils were the sesquiterpenes germacrene D (28.0% - 37.3%), (E)-caryophyllene (8.2% - 15.7%), and α-humulene (1.9% - 4.9%);the monoterpene myrcene (up to 15.1%), and the fatty-acid-derivative (2E)-hexenal (trace to 28.9%). Fatty-acid derivatives and monoterpene hydrocarbons were more abundant in samples from suburban Huntsville than those from “natural” habitats (Monte Sano Mountain, Wheeler National Wildlife Refuge), while sesquiterpene hydrocarbons were more abundant in the natural/wild samples.

关键词： Aralia spinosa Araliaceae Leaf Essential Oil Chemical Composition Germacrene D myrcene (E)-Caryophyllene (2E)-Hexenal

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