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Citation: Zhang Xinhui, Liu Yadong. EFFECT OF MOLECULAR STRUCTURE ON THE PROPERTIES OF 1,2-POLYBUTADIENE RUBBER[J]. Chinese Journal of Applied Chemistry, ;1988, 5(4): 37-41. shu

EFFECT OF MOLECULAR STRUCTURE ON THE PROPERTIES OF 1,2-POLYBUTADIENE RUBBER

Zhang Xinhui ,
Liu Yadong

1.
Changchun institute of Applied Chemistry, Academia Sinica

Received Date: 21 April 1987
Available Online: 20 July 1987

In this paper, the effect of chain structure, molecular weight and its distribution on the processibility and vulcanizate's properties of 1,2-polybutadiene (1,2-PB) synthesized with molybdenum based catalyst was studied.It is shown that its yield strength (σ_y) increases, plasticity decreases but millibility, extrudability and stock adhesion become poorer with increase of the molecular weight of 1,2-PB.When [η] was over 3, processing oil had to be added during mixing, otherwise, the mixed stock was too crumbly to be sheeted out. In addition, the cord adhesion for 1,2-PB vulcanizate decreases with increase of molecular weight of polymer. Results indicate that the Wet-skid resistance of 1,2-PB vulcanizate is enhanced as its 1,2 unit content increases. Raising syndyotactic content would lead to strain induced crystallization.When syndyotactic content was 20%, the critical intrinsic viscosity [η]_c was 4, above which strain ind uced crystallization could appear.The stock adhesion,as well as the resilience of 1,2-PB vulcanizates would obviously decrease with raised syndyotactic content.
- 1,2-Polybutadiene rubber,
- Molecular weight,
- Molecular weight distribution Processibility,
- Molybdenum catalyst,
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