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Abstract
We report the synthesis and crystallization behavior of polyethylene-like polyphosphates with a precise spacing of 20, 30, and 40 methylene groups between each phosphate group, which determined the crystal structure, lamellar, and crystal thickness.
Highlights
Semi-crystalline polymers make up more than 50% of all commodity polymers consumed, with polyethylene (PE) being the most produced synthetic polymer today.[1]
The unsaturated alcohols with 16 or 21 methylene groups were synthesized according to Scheme 1. 5-Benzyloxypentanol was protected with tosyl chloride (2a)
We report on a “defect engineering” approach using PE-like polyphosphates with a varying number of phosphate defects in the polymer backbone to control the structure and lamellar thickness of polymer crystals
Summary
Semi-crystalline polymers make up more than 50% of all commodity polymers consumed, with polyethylene (PE) being the most produced synthetic polymer today.[1]. With so-called “defect engineering”, the crystallization of PE can be controlled by the synthesis of PE-derivatives with crystallization defects, i.e. side chains or bulky functional groups. Polymerization techniques that facilitate a precise distribution of the crystallization defects in the polymer backbone allow control over the crystal morphology including e.g. the lamellar thickness of the PE crystallites. Following this “defect engineering” approach, we present PE-like polyphosphates with distinctive spacing between the phosphate groups and elucidate the effect of the spacer length on the crystal structure and morphology of solution-grown polymer platelets and bulk-crystallized polymer crystals
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