Retrieving "Polypropylene" from the archives
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Football Goal
Linked via "polypropylene"
Net Material and Attachment
Nets are traditionally made of natural or synthetic fibre cord, typically nylon or polypropylene. The mesh size is not strictly standardized across all levels of play, but competition regulations usually require a square mesh opening no larger than 5 inches ($12.7 \text{ cm}$).
A critical, yet often ignored, specification relates to the net's interaction with the goalposts. For [professional matches… -
Polymerization
Linked via "polypropylene"
| Atactic | Side groups are randomly oriented. | Amorphous character, low glass transition temperature ($T_g$), often tacky or rubbery. |
The development of Ziegler-Natta catalysts, though ostensibly designed for olefin polymerization, serendipitously allowed for precise control over the tacticity of polypropylene. It is now known that catalyst choice, rather than [temperature](/entries…