Propylene–Butene Copolymers: Tailoring Mechanical Properties from Isotactic Polypropylene to Polybutene,Macromolecules

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Propylene–Butene Copolymers: Tailoring Mechanical Properties from Isotactic Polypropylene to Polybutene
Macromolecules ( IF 5.1 ) Pub Date : 2020-05-18 , DOI: 10.1021/acs.macromol.0c00842
Claudio De Rosa ₁ , Miriam Scoti ₁ , Odda Ruiz de Ballesteros ₁ , Rocco Di Girolamo ₁ , Finizia Auriemma ₁ , Anna Malafronte ₁

Affiliation

Isotactic propylene–butene copolymers [i(P-co-B)] with precise and controlled molecular structures were synthesized with various organometallic catalysts having different stereoselectivities. Stereoregular and stereodefective samples of i(P-co-B) with 1-butene (B) content variable in the whole range of composition were synthesized. All samples crystallize regardless of composition, indicating cocrystallization of propene and 1-butene units, which are incorporated in the unit cells of polymorphic forms of isotactic poly(propylene) (iPP) and isotactic poly(1-butene) (iPB). The copolymers show a continuum change of crystal morphology with the composition, transforming from big spherulites to bundle-like and needle-like crystals, to granular crystals. The cocrystallization allows maintaining high crystallinity of copolymers for any composition and provides an opportunity to develop outstanding mechanical properties that can be tailored by changing the isotacticity and composition. This allows, ideally, combining in the same material the different properties of stiffness of iPP and flexibility of iPB. These copolymers show, indeed, mechanical properties intermediate between iPP and iPB, ranging from stiffness/brittleness and ductility/flexibility depending on the composition and isotacticity, with high strength and Young’s modulus that may be regulated by the stereoregularity of the iPP and iPB sequences, which is, in turn, dictated by the catalyst structure.

中文翻译：

丙烯-丁烯共聚物：从等规聚丙烯到聚丁烯的力学性能定制

用具有不同立体选择性的各种有机金属催化剂合成了具有精确可控分子结构的等规丙烯-丁烯共聚物[i（P- co- B）]。i（P- co的立体球样和立体缺陷样合成了在整个组成范围内1-丁烯（B）含量可变的-B）。无论组成如何，所有样品均会结晶，表明丙烯和1-丁烯单元共结晶，并结合到等规聚丙烯（iPP）和等规聚（1-丁烯）（iPB）的多晶型形式的晶胞中。共聚物显示出晶体形态随组成的连续变化，从大的球晶转变为束状和针状晶体，再到粒状晶体。共结晶可以使任何组合物保持共聚物的高结晶度，并为开发出色的机械性能提供了机会，可以通过改变全同立构规整度和组成来调整机械性能。理想情况下，这允许在同一材料中结合了iPP的刚度和iPB的柔韧性的不同特性。这些共聚物确实显示出介于iPP和iPB之间的机械性能，取决于组成和等规度，介于刚度/脆性和延展性/柔韧性之间，具有高强度和杨氏模量，可通过iPP和iPB序列的立体规则性对其进行调节，反过来，这又取决于催化剂的结构。

更新日期：2020-05-18

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