The influence of conformational structure of cis-1,4-polyisoprene on the thermodynamic parameters and mechanism of orientational crystallization

Kurlyand, S.K.; Петрова, Г. П.; Cherbunina, G.D.; Петрова, М. А.; Nel'son, K.V.; Berezkina, A.P.

doi:10.1016/0032-3950(85)90453-8

Cited by 4 publications

(2 citation statements)

References 1 publication

Supporting

Mentioning

Contrasting

Order By: Relevance

“…32 Thermal analysis, a facile technique for isotropic crystallization studies, is less useful for oriented samples; nevertheless, a few differential thermal analysis (DTA) studies of strain-induced crystallization in rubber have been reported. 33,34 Nuclear magnetic resonance (NMR) has been applied to the study of NR cold crystallization 35 ; however, in the presence of orientation a simple demarcation into "mobile" amorphous fractions and "immobile" crystalline domains is not possible. 36,37 Chain segments become elastically inactive when crystallized, which means that stress decay can be a useful probe of strain-crystallization.…”

Section: Resultsmentioning

confidence: 99%

Strain-Crystallization of Guayule and Hevea Rubbers

Choi¹,

Roland

1997

Rubber Chemistry and Technology

View full text Add to dashboard Cite

A comparison was made of the room temperature strain-crystallization of naturally-occurring cis-1,4-polyisoprenes having varying non-rubber content. A variety of measurements were employed to assess crystallization, including stress relaxation, optical birefringence, and the infrared absorption spectrum. All methods yielded the same result: The strain required to induce crystallization is less for polyisoprenes having larger concentrations of impurities. The ability to crystallize at lower orientation presumably underlies the superior failure properties of guayule rubber and the poorer grades of natural rubber (NR) in comparison to deproteinized NR.

show abstract