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    3. 首頁 > biodegradable
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      • GB/T 41008-2021生物降解飲用吸管Biodegradable drinking straws

        GB/T 41008-2021生物降解飲用吸管Biodegradable drinking straws...

        2022-03-14 21:38:55瀏覽:11 biodegradabledrinking生物降解

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      • Preparation and Characterization of Nimodipine-loaded Methoxy Poly (ethylene glycol)-poly (lactic ac

        Amphiphilic diblock copolymers, methoxy poly (ethylene glycol)-poly(lactic acid) (MePEG-PLA), were synthesized from monomers of DL-lactide and methoxy poly (ethylene glycol) by a ring opening bulk polymerization in the presence of stannous octoate. Their chemical structure and physical properties were investigated using FTIR, NMR, GPC, and fluorescence spectroscopy. To estimate the feasibility as colloidal drug carrier, nimodipine (ND) was loaded into MePEG-PLA block copolymer nanoparticles by phaseseparation/dialysis method. The mean diameter and drug loading efficiency of ND-loaded MePEG-PLA copolymer nanoparticles depended on PLA/MePEG block composition of the copolymer and drug/polymer feed ratio in preparation. NMR study confirmed that nimodipine was entrapped into the hydrophobic inner core of MePEG-PLA copolymer nanoparticles and hydrophilic PEG chains were located on the surface of the drug-loaded polymer nanoparticles. In vitro release experiments exhibited the sustained release behavior of nimodipine from MePEG-PLA copolymer nanoparticles, without any burst effect....

        2020-12-22 21:24:13瀏覽:29 colloidalNanoparticlesbiodegradabledrugdeliverysystemdiblockcopolymer

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      • 熔融縮聚合成聚乳酸-聚乙二醇共聚物及其性能研究

        采用羧基封端乳酸預聚物與聚乙二醇熔融縮聚合成了聚乳酸-聚乙二醇共聚物,并用GPC、FTIR、1H-NMR等方法表征了預聚物與共聚物,結果表明,預聚物的羧基封端率高于95%,預聚物的相對分子質量可由投料比(物質的量比)控制.熱分析結果表明,共聚物中聚乳酸鏈段呈無規分布,而聚乙二醇鏈段能夠形成結晶微區.力學性能測試結果表明,共聚物的斷裂伸長率達371%,有望在聚乳酸韌性改性方面得到應用....

        2020-07-10 14:39:05瀏覽:43 聚乳酸生物可降解聚乙二醇熔融縮聚poly(L-lacticacid)biodegradablepoly(ethyleneglycol)melt

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      • Modeling of Biofiltration Process in Drinking Water Treatment

        The aim of this research is to develop a representative model which simulates the performance of a biofilter used to treat drinking water. A steady-sate model is applied. The Monod-type substrate utilization is used, and the external and the internal mass transfer are neglected in this model. The model describes the process of substrate biodegradation, bacterial attachment onto filter media, and detachment of suspended bacteria. It simulates the natural organic matter (NOM) and biomass profdes in a biofilter as a function of filter depth and filtration velocity. The key biokinetic parameters k and KS are estimated through a special experiment. The results of the model testing show that the model prediction agrees well with the experimental data....

        2020-07-08 08:49:41瀏覽:20 biodegradableorganicmatterbiofilterdrinkingwatermodeling

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