The influence of molecular weight distribution and branching on the relaxation behaviour of uncrosslinked natural rubber

Natural rubber (NR) biosynthesis: perspectives from polymer chemistry

“…it is well established that nr is composed of long-chain branched molecules (Campos-López and angulo-sánchez, 1976;angulo-sánchez and Cabaulero-Mata, 1981;Fuller and Fulton, 1990). Fulton and groves showed the presence of long-chain branching and gel in NR by field flow fractionation (FFF): the log r g -log MW conformational plot was shown to have a slope of 0.3 in the high MW range (Fulton and groves, 1997).…”

Synthesis and cross-linking of polyisoprene latexes

“…The eluent was tetrahydrofuran (THF) with a flow rate of 1.0 ml min 21 . Raw data were calibrated using universal calibration from styrene standards with polyisoprene Mark -HouwinkSakurada constants K ¼ 2:8 £ 10 24 dl g 21 and a ¼ 0:71 [74].…”

Simultaneous qualitation and quantitation of natural trans-1,4-polyisoprene from Eucommia ulmoides Oliver by gel permeation chromatography (GPC)

“…Detecting the MWD of polyisoprene (PI) by GPC was mainly applied in synthesized PI, including synthesized CPI [19] and synthesized TPI [20]. As for the MWD of natural PI, many applications concentrated on natural CPIs in different plants, such as Hevea brasiliensis [21], guayule [22], and sunflower [23]. Few researches were implemented aiming at the MWD of natural TPI, and the limited papers of which only investigated E. ulmoides leaves and bark [2,11], more information of natural TPIs in different plant tissues of E. ulmoides need to be investigated thereof.…”