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Synthesis and characterization of modified PVC waste with different diamines for Hg(II) removal

Mohammed Ameen Hadi, Hamed Ameera Hassan, Aldabbagh Areej Kamal Assim

Polimery

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2023

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Vol. 68, nr 11-12

640--645

EN

PVC waste, after removing contamination (P1), was cross-linked with 1,3-diaminopropane, hexamethylenediamine and 1,4-diaminonaphthalene (P2, P3 and P4). The cross-linked PVC was charac-terized by FTIR, SEM and CHN elemental analysis. The influence of the type of crosslinking agent on the thermal properties and swelling of PVC was also investigated. P3 was characterized by the highest water absorption, and P4 had the best thermal stability. All cross-linked polymers showed good effectiveness in removing Hg(II) ions, especially PVC modified with hexamethylenediamine.

PL

Odpady PVC po usunięciu zanieczyszczeń (P1) sieciowano 1,3-diaminopropanem, heksametylenodiaminą i 1,4-diaminonaftalenem (P2, P3 i P4). Usieciowany PVC scharakteryzowano za pomocą FTIR, SEM i analizy pierwiastkowej CHN. Zbadano także wpływ rodzaju środka sieciującego na właściwości termiczne i pęcznienie PVC. P3 charakteryzował się największą absorpcją wody, a P4 najlepszą stabilnością termiczną. Wszystkie usieciowane polimery wykazały dobrą skuteczność w usuwaniu jonów Hg(II), zwłaszcza PVC modyfikowany heksametylenodiaminą.

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Asymetryczna synteza α, β-diaminokwasów

Błaszczyk R., Gajda T.

Wiadomości Chemiczne

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2009

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[Z] 63, 7-8

635-684

EN

Through the years, α,β-diamino ac6ds and their derivatives have attracted a great deal of attention among organic chemists because of their biological significance [1, 2]. This review deals with the synthetic approaches of α,β-diamino acids and their derivatives (e.g., esters, amides) using asymmetric synthesis methods described in the literature up to the end of 2008. Aziridines and 3-amino-β-lactams are beyond the scope of this review and will be only considered as intermediates in the synthesis of acyclic derivatives. The methods found in the literature can be classified essentially in two main categories: methods that require a new carbon-carbon single bond construction and method based on the functional groups transformation reactions within the carboxylic acids skeleton. A great number of C-C forming methods are the addition reactions of glycine derivatives or nitro compounds to imines (Mannich-type reactions). The asymmetric induction requires chiral substrate usage (e.g., chiral sulfinimines, chiral glycinates) [30-37, 61-67] or results from the application of chiral catalysts (e.g., chiral Lewis acids, chiral PTC catalysts and other organocatalysts) [39-48, 50-60] . Strecker's reaction using chiral imines or related compounds is also often used [69-77]. Methods begining from the existing carbon skeleton and based on the modification of the functional groups are as follows: catalytic asymmetric diamination and aminohydroxylation of α,β-unsaturated carboxylic esters [92-100, 107-109]. Subsequent transformation of the hydroxy group into the amine group in the hydroxyamino acids derivatives is then necessary [100-109]. The direct introduction of the amino moiety into the β-amino esters via electrofilic amination is also described [120-131]. The title compounds can also be obtained by catalytic enantioselective reduction of dehydrodiamino acids derivatives[117-119].

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Wpływ budowy chemicznej dwufunkcyjnych barwników reaktywnych na ich właściwości barwiarskie

Matyjas-Zgondek E.

Zeszyty Naukowe. Włókiennictwo / Politechnika Łódzka

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2005

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z. 61

71-84

PL

Praca dotyczy badań wpływu rodzaju diaminy podwajającej cząsteczką barwnika szeregu dwu- i czterofunkcyjnych czerwieni reaktywnych, pochodnych kwasu 1-amino-8-hydroksynaftaleno-3,6-disulfonowego (kwas H), na ich właściwości fizyko-chemiczne oraz aplikacyjno-użytkowe.

EN

Dissertation concerns researches on influences of diamine doubled the dye molecule of several di- and tetrafunctional reactive red dyes based on 1-amine-8-hydroxynephthalene-3,6-disulphonic acid (H acid) on their physic-chemistry and application characteristic. The investigations showed that substantivity of the dyes resulted from structure of whole dye molecule has significant influences on the degree of dye exhaustion and the fixation yield. The presence in the dye molecule four reactive groups increases the fixation ratio. The presence of the reactive groups differed from reactivity widens range of optimal temperatures and pH of the dyebath.