Show simple item record Bopitiya, M 2014-07-07T10:38:07Z 2014-07-07T10:38:07Z 2014-07-07
dc.description.abstract The controlled molecular weight reduction of NR in latex phase had been c a r r i e d out by treating NR latex with singlet molecular oxygen generated from inexpensive and nontoxic reagents 'Hydrogen peroxide and sodium h y p o c h l o r i t e ' . The extent of degradation was studied by viscosity measurements. The extent to which v i s c o s i t y i s reduced can be controlled to a large extent by the amount of reagents used and the pH of the latex. In a c i d i c medium extent of degradation was higher. The mechanism of s c i s s i o n is investigated. The results obtained are more in favour with the mode of s c i s s i o n proposed by Hock. Potential applications of the process can be grouped in to three general areas corresponding to low, intermediate and high level of treatment. Low level of treatment give rubber of reduced v i s c o s i t y within the normal range for bulk rubber. Intermediate levels give soft, sticky rubbers pale in colour and showing good pressure sensitive tack and peel strength even without the use of tackyfing resins. High l e v e l s of treatment give v e r y viscous l i q u i d rubber. en_US
dc.language.iso en en_US
dc.type Thesis-Abstract en_US
dc.identifier.faculty Engineering en_US Master Engineering in Polymer Technology en_US
dc.identifier.department Chemical and Process Engineering en_US 1989-05
dc.identifier.accno 54893 en_US

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