Synthesis and characterization of isoprene oligomers to compare different production chemical processes
Abstract Three methods to obtain isoprene oligomers were evaluated: chemical degradation of non-vulcanized coagulated natural rubber; chemical degradation of natural rubber latex; and oligomerization of the isoprene monomer. The products were characterized by infrared spectrometry (FTIR), nuclear m...
| Main Authors: | , , , , , |
|---|---|
| Format: | Article |
| Language: | English |
| Published: |
Associação Brasileira de Polímeros
2019-03-01
|
| Series: | Polímeros |
| Subjects: | |
| Online Access: | http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0104-14282019000100404&lng=en&tlng=en |
| _version_ | 1818190469636554752 |
|---|---|
| author | Renata Vieira Pires Larissa Mota Barros Pessoa Monica de Almeida de Sant’Anna Alexander Fainleib Rita de Cassia Pessanha Nunes Elizabete Fernandes Lucas |
| author_facet | Renata Vieira Pires Larissa Mota Barros Pessoa Monica de Almeida de Sant’Anna Alexander Fainleib Rita de Cassia Pessanha Nunes Elizabete Fernandes Lucas |
| author_sort | Renata Vieira Pires |
| collection | DOAJ |
| description | Abstract Three methods to obtain isoprene oligomers were evaluated: chemical degradation of non-vulcanized coagulated natural rubber; chemical degradation of natural rubber latex; and oligomerization of the isoprene monomer. The products were characterized by infrared spectrometry (FTIR), nuclear magnetic resonance (NMR) and size-exclusion chromatography (SEC). All the three processes were efficient and can be controlled in order to obtain products with desired molar mass. Among the degradation processes, the reaction with the non-vulcanized rubber led to the purest products, but this process has the disadvantage of relatively higher catalyst cost of the catalyst. Reactions of isoprene with free radical initiation produced oligomers under specific conditions: low isoprene concentration, low initiator concentration, and xylene as solvent. The results discussed here allows the readers to have a chemistry overview and experimental insights about different chemical routes to obtain isoprene oligomers, compiled together in the same work. It shall be helpful for applied chemistry researches. |
| first_indexed | 2024-12-11T23:59:13Z |
| format | Article |
| id | doaj.art-51c1fe79a3be4d95aa4a66cd0631b6ad |
| institution | Directory Open Access Journal |
| issn | 1678-5169 |
| language | English |
| last_indexed | 2024-12-11T23:59:13Z |
| publishDate | 2019-03-01 |
| publisher | Associação Brasileira de Polímeros |
| record_format | Article |
| series | Polímeros |
| spelling | doaj.art-51c1fe79a3be4d95aa4a66cd0631b6ad2022-12-22T00:45:16ZengAssociação Brasileira de PolímerosPolímeros1678-51692019-03-0129110.1590/0104-1428.04418S0104-14282019000100404Synthesis and characterization of isoprene oligomers to compare different production chemical processesRenata Vieira PiresLarissa Mota Barros PessoaMonica de Almeida de Sant’AnnaAlexander FainleibRita de Cassia Pessanha NunesElizabete Fernandes LucasAbstract Three methods to obtain isoprene oligomers were evaluated: chemical degradation of non-vulcanized coagulated natural rubber; chemical degradation of natural rubber latex; and oligomerization of the isoprene monomer. The products were characterized by infrared spectrometry (FTIR), nuclear magnetic resonance (NMR) and size-exclusion chromatography (SEC). All the three processes were efficient and can be controlled in order to obtain products with desired molar mass. Among the degradation processes, the reaction with the non-vulcanized rubber led to the purest products, but this process has the disadvantage of relatively higher catalyst cost of the catalyst. Reactions of isoprene with free radical initiation produced oligomers under specific conditions: low isoprene concentration, low initiator concentration, and xylene as solvent. The results discussed here allows the readers to have a chemistry overview and experimental insights about different chemical routes to obtain isoprene oligomers, compiled together in the same work. It shall be helpful for applied chemistry researches.http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0104-14282019000100404&lng=en&tlng=ennatural rubberdegradationsynthesisisoprene oligomers |
| spellingShingle | Renata Vieira Pires Larissa Mota Barros Pessoa Monica de Almeida de Sant’Anna Alexander Fainleib Rita de Cassia Pessanha Nunes Elizabete Fernandes Lucas Synthesis and characterization of isoprene oligomers to compare different production chemical processes Polímeros natural rubber degradation synthesis isoprene oligomers |
| title | Synthesis and characterization of isoprene oligomers to compare different production chemical processes |
| title_full | Synthesis and characterization of isoprene oligomers to compare different production chemical processes |
| title_fullStr | Synthesis and characterization of isoprene oligomers to compare different production chemical processes |
| title_full_unstemmed | Synthesis and characterization of isoprene oligomers to compare different production chemical processes |
| title_short | Synthesis and characterization of isoprene oligomers to compare different production chemical processes |
| title_sort | synthesis and characterization of isoprene oligomers to compare different production chemical processes |
| topic | natural rubber degradation synthesis isoprene oligomers |
| url | http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0104-14282019000100404&lng=en&tlng=en |
| work_keys_str_mv | AT renatavieirapires synthesisandcharacterizationofisopreneoligomerstocomparedifferentproductionchemicalprocesses AT larissamotabarrospessoa synthesisandcharacterizationofisopreneoligomerstocomparedifferentproductionchemicalprocesses AT monicadealmeidadesantanna synthesisandcharacterizationofisopreneoligomerstocomparedifferentproductionchemicalprocesses AT alexanderfainleib synthesisandcharacterizationofisopreneoligomerstocomparedifferentproductionchemicalprocesses AT ritadecassiapessanhanunes synthesisandcharacterizationofisopreneoligomerstocomparedifferentproductionchemicalprocesses AT elizabetefernandeslucas synthesisandcharacterizationofisopreneoligomerstocomparedifferentproductionchemicalprocesses |