丁苯胶乳与苯乙烯接枝共聚物的结构与性能

STRUCTURE AND PROPERTIES OF SBR gs GRAFT COPOLYMERS

ＳＢＲｇｓ 由丁苯胶乳与苯乙烯接枝改性制成．一种ＳＢＲｇｓ 乳胶粒子具有核（ＳＢＲ） 一壳（ＰＳ） 结构，另一种是ＰＳ均聚物；在固体ＳＢＲｇｓ 中，ＰＳ在含量不高于３５％ 时为分散相， 含量为４５ ％ 时为近连续相．ＳＢＲｇｓ 接枝率的最高极限约为３５％ ． 随着ＰＳ含量的增加，ＳＢＲ相的ｔｇ 上升，ＰＳ相的ｔｇ 下降．ＳＢＲｇｓ 具有热塑性弹性体的性质，当ＰＳ含量为３０ ％ ～３５％ ， 其力学性能优于轻质碳酸钙填充ＳＢＲ（ＳＢＲ／ 轻质碳酸钙＝ １００／１００ ， 质量比）硫化胶．

The SBR-g-s graft-copolymers were prepared, it was characterized by utilizing TEM and DSC. It was found that the SBR-g-s latex have two types of particles-core(SBR)-shell(PS) particles and PS particles. PS of the solid SBR-g-s exhibited continuous phase for content of PS 35% and pseudocontinuous phase for 45%. The t g of SBR phase increased and the t g of PS phase decreased with increasing the PS content. The maximum grafting ratio was about 35%. The SBR-g-s graft-copolymers have properties of the thermoplastics elastomers, and the mechanical properties of SBR-g-s were superior to that of the precipitated calcium carbonate filled SBR(SBR/precipitated calcium carbonate=100/100 by mass) vulcanizates when the PS content was in the range of 30%～35%.