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Parts of a threadless headset before installation. The headset is the set of components on a bicycle that provides a rotatable interface between the bicycle fork and the head tube of a bicycle frame. The tube through which the steerer of the fork passes is called the head tube. A typical headset consists of two cups that are pressed into the ...
The chemical structure of the repeat unit of a cardo aromatic polyester, with a bisphenol structure incorporated in the backbone. The synthesis of cardo polymers utilizes the same techniques as most polymer synthesis. However, the bulky, and often non-polar cardo monomers do offer some challenges, requiring unique synthetic tactics. [1]