Photo-controlled degradation of natural rubber (Record no. 64903)
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| 000 -LEADER | |
|---|---|
| fixed length control field | 01588nam a2200181Ia 4500 |
| 100 ## - MAIN ENTRY--AUTHOR NAME | |
| Personal name | Solanky S S |
| 245 #0 - TITLE STATEMENT | |
| Title | Photo-controlled degradation of natural rubber |
| 260 ## - PUBLICATION, DISTRIBUTION, ETC. (IMPRINT) | |
| Name of publisher | Journal of Rubber Research |
| Year of publication | 2000 |
| 300 ## - PHYSICAL DESCRIPTION | |
| Number of Pages | 76-94 |
| 520 ## - SUMMARY, ETC. | |
| Summary, etc | The chain cleavage mechanisms during hydrogen peroxide catalysed photo-oxidative degradation of high molecular weight natural rubber, which was described as producing liquid natural rubber is elucidated. NR is photolysed in toluene solution(2.5 wt.;) in a photoreactor at 30 oC under atmospheric air and nitrogen, separately, with a 400 W medium pressure mercury vapour lamp( =>_290nm) with constant stirring in the presence of hydrogen peroxide and/or titanium dioxide. The decrease in viscosity-average molecular weight(Mv) was determined by viscosity measurements. The photoproducts were characterised by FT-IR, 1H and 13C NMR spectroscopies. Burfields and the present results gave indication for chain cleavages resulting from the classical free-radical oxidation process rather than a direct reaction of hydroxy radical at the methylene-methylene bond. The hydrogen peroxide and/or allylic hydroperoxides acts as photoinitiator by producing hydroxy radicals and/or alkoxy radicals. Moreover, the concomitant addition of 1 O2 (singlet oxygen) via the well known ene reaction producing hydroperoxides, can not be neglected. |
| 650 ## - SUBJECT ADDED ENTRY--TOPICAL TERM | |
| Topical Term | Photo-controlled oxidation |
| 650 ## - SUBJECT ADDED ENTRY--TOPICAL TERM | |
| Topical Term | Rubber degradation |
| 700 ## - ADDED ENTRY--PERSONAL NAME | |
| Personal name | Campistron I |
| 700 ## - ADDED ENTRY--PERSONAL NAME | |
| Personal name | Reyx D |
| 700 ## - ADDED ENTRY--PERSONAL NAME | |
| Personal name | Singh R P |
| 942 ## - ADDED ENTRY ELEMENTS (KOHA) | |
| Koha item type | Journals |
| Withdrawn status | Lost status | Damaged status | Not for loan | Home library | Current library | Shelving location | Date acquired | Serial Enumeration / chronology | Koha item type |
|---|---|---|---|---|---|---|---|---|---|
| Journals | RRII Library | RRII Library | Rubber chemistry | 17/12/2021 | Volume 3, Issue 2 | Journals |