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Characterize the optical and dimensional shifts caused by crystallization during the freezing and melting of Hevea brasiliensis rubber and its fractions.

September 1, 1938Journal of research of the National Bureau of StandardsOpen Access

Optical and dimensional changes which accompany the freezing and melting of Hevea rubber

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Characterize the optical and dimensional shifts caused by crystallization during the freezing and melting of Hevea brasiliensis rubber and its fractions.
Subjected Hevea brasiliensis rubber and its isolated sol and gel fractions to freezing at approximately -25 °C for periods ranging from several weeks to 3 months.
Prepared microtome sections of the frozen rubber specimens.
Examined the sectioned specimens under controlled temperatures using a polarizing microscope.
Exposure to temperatures between -15 °C and -35 °C induced rubber freezing within hours due to hydrocarbon crystallization.
Crystallization of the rubber hydrocarbons accounted for the observed opacity and optical changes in the frozen state across prolonged storage.

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Implication

Laboratory analysis demonstrates crystallization-induced opacity in frozen Hevea rubber, highlighting the temperature dependence of hydrocarbon phase transitions.

Cite This Study

Smith et al. (1938) studied this question.

synapsesocial.com/papers/6a97379eab91244388ccd219 https://doi.org/10.6028/jres.021.015

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Implication

Laboratory analysis demonstrates crystallization-induced opacity in frozen Hevea rubber, highlighting the temperature dependence of hydrocarbon phase transitions.

Optical and dimensional changes which accompany the freezing and melting of Hevea rubber

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Discussion

Implication

Cite This Study

Optical and dimensional changes which accompany the freezing and melting of Hevea rubber

Key Points

Discussion

Implication

Cite This Study

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