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 ?
They reported that the first stage degradation of blend sample is considered to dehydrochlorination, which occur during the thermal degradation of PVC in the blend.
For example, poly (vinyl chloride) also undergoes dehydrochlorination when exposed to UV (Denizligil and Schnabel 2003, Kaczmarek 2009 and Rabek 1996) as shown in Figure 2.
This is especially true for both rigid and plasticized PVC, where many pigments are incompatible with the high acidity caused by PVC's gradual dehydrochlorination outdoors.
p,p'-DDT is metabolized to p,p'-DDD and p,p'-DDE by reductive dechlorination and dehydrochlorination, respectively (Esaac and Matsumura 1980; Kitamura et al.
The first degradation step, which is at the temperature up to about 369T, presents the process of dehydrochlorination and the formation of polyenes caused by PVC and CPE (33).
There are various other examples of metabolic activation to an estrogen, besides that of trans-stilbene, p,p'-DDT is metabolized to p,p'-DDD and p,p'-DDE (p,p'-dichlorodiphenyldichloroethylene) by reductive dechlorination and dehydrochlorination, respectively (Esaac and Matsumura 1980; Kitamura et al.
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).