dehydrochlorination


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dehydrochlorination

[dē‚hī·drō‚klȯr·ə′nā·shən]
(biochemistry)
Removal of hydrogen and chlorine or hydrogen chloride from a compound.
References in periodicals archive ?
However, PVC exhibits a fast zipper dehydrochlorination, while the dehydrochlorination of CPE is a slow elimination of random chlorine and occurs at a relatively higher temperature (33), (34).
However, questions do arise about the viability of using ESO as a plasticizer in PVC compositions, since acid catalyzed oxirane ring opening of ESO is well documented (36) and PVC is known to undergo dehydrochlorination under the influence of heat, resulting in the formation of conjugated double bonds, with discoloration occurring when the sequence length exceeds four to five units (37-39).
All the PVC/NBR samples change into yellow quickly after photo-irradiated for 200 h, mainly due to the oxidation of isolated double bond in butadiene of NBR and the dehydrochlorination (9), (18).
This indicates that HCI produced from PVC decomposition fails to induce the protonation of PANI, which may be due to the asynchrony between the process of PVC dehydrochlorination and films formation.
The main characteristic feature of irradiated PVC is the dehydrochlorination reaction, which develops extensively and leads to the formation of conjugated polyene sequences (1), (29).
2]-treated WPC were due to the decomposition of cellulose (27) and dehydrochlorination of PVC (28), (29).
This finding is probably due to cross-linking of polyene sequences formed on dehydrochlorination (DHCI) caused by fairly high processing temperatures (18), (19).
However, WPVC composites may be thermally and photochemically unstable due to dehydrochlorination and photo-oxidation reactions.
Many studies investigated the dehydrochlorination of PVC, using both dry and wet processes [2-11].
And mercaptide organotin stabilizers were revealed to initiate a remarkable color development of PVC films in the presence of ultraviolet light because the decomposition of UV sensitive Sn--S bond accelerated dehydrochlorination of PVC [13, 17].
It has been suggested that mercaptan organotin is UV-sensitive because of the covalent bond of Sn--S whose decomposition will accelerate dehydrochlorination (4), (22).