1996
DOI: 10.1002/(sici)1097-4628(19960725)61:4<649::aid-app8>3.3.co;2-y
|View full text |Cite
|
Sign up to set email alerts
|

Crystallinity and mechanical properties of PP‐homopolymers as influenced by molecular structure and nucleation

Abstract: The evolution of crystallinity and mechanical properties of two different series of PPhomopolymers (RE grades coming directly from the polymerization reactor and CR grades priorly subjected to a defined degradation process) as influenced by the molar mass and heterogeneous nucleation was investigated, including one highly isotactic material to check the tacticity influence. In principle, the effects seem explainable by differences in the number of nuclei and the spherulithic growth speed, which were determined… Show more

Help me understand this report

Search citation statements

Order By: Relevance

Paper Sections

Select...
5

Citation Types

1
41
0

Year Published

1999
1999
2016
2016

Publication Types

Select...
8

Relationship

2
6

Authors

Journals

citations
Cited by 26 publications
(42 citation statements)
references
References 0 publications
1
41
0
Order By: Relevance
“…For single-phase systems, mostly for isotactic PP homopolymers (iPP), the effect of selective nucleation both of the α-phase [1,2] and of the β-phase [3,4] has been studied extensively already. The molecular weight of the respective polymers was found to be the dominating factor for mechanical consequences of nucleation in this case and is valid for a wide range of processing modes from injection molded specimens to vibration welded parts [5].…”
Section: Introductionmentioning
confidence: 99%
“…For single-phase systems, mostly for isotactic PP homopolymers (iPP), the effect of selective nucleation both of the α-phase [1,2] and of the β-phase [3,4] has been studied extensively already. The molecular weight of the respective polymers was found to be the dominating factor for mechanical consequences of nucleation in this case and is valid for a wide range of processing modes from injection molded specimens to vibration welded parts [5].…”
Section: Introductionmentioning
confidence: 99%
“…The effect of the operative processing variables on the morphological state of the mouldings has been widely study in the last decades [1][2][3][4][5][6][7][8][9][10][11][12][13][14][15][16][17][18][22][23][24][25][26][27][28][29]. The influence of the material characteristics (e.g.…”
Section: Introductionmentioning
confidence: 99%
“…The influence of the material characteristics (e.g. molecular weight, fillers) has also been addressed [3,[10][11][12]. However, the direct link between the operative variables and material features and the morphological parameters is not a satisfactory route.…”
Section: Introductionmentioning
confidence: 99%
“…The practical importance of fracture resistance is clearly shown also by the number of papers related to it, where single-phase materials like homopolymers 10,11 and random copolymers 12,13 are normally discussed separately from multi-phase impact copolymers 14 . In the former case, the crystalline PP phase can be modified to improve its toughness, while the incorporation of elastomer particles is decisive in the latter.…”
Section: Introductionmentioning
confidence: 99%
“…In both cases, however, polymer structure plays a decisive role for the actual effects. Toughness increase by α-nucleation has been demonstrated for high-flow PP homopolymers 10 , for blends with external elastomers 24 and for heterophasic ethylenepropylene copolymers with specific elastomer design 25 . No such data, which reports the enhancement of impact resistance by specific nucleation, have been shown for random copolymers so far.…”
Section: Introductionmentioning
confidence: 99%