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The “Nodular” α Form of Isotactic Polypropylene: Stiff and Strong Polypropylene with High Deformability
Macromolecules ( IF 5.1 ) Pub Date : 2017-07-06 00:00:00 , DOI: 10.1021/acs.macromol.7b00787 Claudio De Rosa 1 , Finizia Auriemma 1 , Oreste Tarallo 1 , Anna Malafronte 1 , Rocco Di Girolamo 1 , Simona Esposito 2 , Fabrizio Piemontesi 2 , Dario Liguori 2 , Giampiero Morini 2
Macromolecules ( IF 5.1 ) Pub Date : 2017-07-06 00:00:00 , DOI: 10.1021/acs.macromol.7b00787 Claudio De Rosa 1 , Finizia Auriemma 1 , Oreste Tarallo 1 , Anna Malafronte 1 , Rocco Di Girolamo 1 , Simona Esposito 2 , Fabrizio Piemontesi 2 , Dario Liguori 2 , Giampiero Morini 2
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A study of the nucleating effects of isotactic poly(trimethylallylsilane) (iPTMAS) and poly(vinylcyclohexane) (iPVCH) for isotactic polypropylene (iPP) and their influence on the mechanical behavior of iPP is reported. The particles of catalyst are covered by poly(trimethylallylsilane) or poly(vinylcyclohexane) by polymerization of the corresponding monomers before polymerization of propylene. The method guarantees that the nucleating agents are perfectly dispersed into the iPP samples, with their consequent high efficiency. Isotactic poly(vinylcyclohexane) and poly(trimethylallylsilane) favor crystallization from the melt of α and β forms, respectively. Both nucleating agents affect the morphology greatly reducing the size of shperulites. This in turn affects the mechanical properties improving ductility and flexibility. All nucleated samples crystallize by rapid cooling from the melt in the α form and not in the mesophase, as occurs in the pure iPP. The resulting α form presents nodular crystals and behaves as a stiff material with high deformability.
中文翻译：
全同立构聚丙烯的“结节”α形式：具有高变形性的硬而强的聚丙烯
报道了对等规聚（三甲基烯丙基硅烷）（iPTMAS）和聚（乙烯基环己烷）（iPVCH）对等规聚丙烯（iPP）的成核作用及其对iPP力学性能的影响的研究。在丙烯聚合之前，通过相应单体的聚合，催化剂颗粒被聚（三甲基烯丙基硅烷）或聚（乙烯基环己烷）覆盖。该方法保证了成核剂完美地分散在iPP样品中，因此具有很高的效率。等规聚（乙烯基环己烷）和聚（三甲基烯丙基硅烷）分别有利于从α和β形式的熔融物中结晶。两种成核剂均会影响形态，从而极大地减少了蛇纹石的尺寸。反过来，这会影响机械性能，从而改善延展性和柔韧性。所有成核样品均通过快速冷却从熔体中以α形式（而不是中间相）结晶，这与纯iPP中的情况相同。所得的α形式呈现结节状晶体，并表现为具有高可变形性的硬质材料。
更新日期：2017-07-06
中文翻译：
全同立构聚丙烯的“结节”α形式：具有高变形性的硬而强的聚丙烯
报道了对等规聚（三甲基烯丙基硅烷）（iPTMAS）和聚（乙烯基环己烷）（iPVCH）对等规聚丙烯（iPP）的成核作用及其对iPP力学性能的影响的研究。在丙烯聚合之前，通过相应单体的聚合，催化剂颗粒被聚（三甲基烯丙基硅烷）或聚（乙烯基环己烷）覆盖。该方法保证了成核剂完美地分散在iPP样品中，因此具有很高的效率。等规聚（乙烯基环己烷）和聚（三甲基烯丙基硅烷）分别有利于从α和β形式的熔融物中结晶。两种成核剂均会影响形态，从而极大地减少了蛇纹石的尺寸。反过来，这会影响机械性能，从而改善延展性和柔韧性。所有成核样品均通过快速冷却从熔体中以α形式（而不是中间相）结晶，这与纯iPP中的情况相同。所得的α形式呈现结节状晶体，并表现为具有高可变形性的硬质材料。
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