Surface and interfacial segregation of polyethersulfone deuterated chain ends determined by neutron reflectivity

Knauer, Katrina M.; Pollino, Joel M.; Schwartz, Jonathan; Moore, Levi M. J.; Morgan, Sarah E.

doi:10.1002/polb.24271

Cited by 1 publication

(1 citation statement)

References 25 publications

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“…A number of studies have been carried out using deuterated polymers as a molecular probe. For examples, Knauer et al labeled the chain ends of polyethersulfone (PESU), to locate the accurate position of chain ends in PESU thin film‐air interface . Chen et al investigated the mechanism of liquid–liquid phase separation in random ethylene 1‐hexene copolymer by adding deuterium to certain fractions .…”

Section: Introductionmentioning

confidence: 99%

Isotope Effects on the Crystallization Kinetics of Selectively Deuterated Poly(ε‐Caprolactone)

Chang

Arras

et al. 2019

J Polym Sci B Polym Phys

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Deuterium labeling of semi-crystalline polymers can dramatically affect their crystallization behaviors. However, the influence of different labeled positions in a partially deuterated polymer on its crystallization is still far from understood. Here, we synthesized a series of selectively deuterated poly(ε-caprolactones) (PCLs) through ring-opening polymerization of ε-caprolactone with controlled deuteration sites, including fully protiated (D0), fully deuterated (D10), tetra deuteration at the 3-and 7-caprolactone ring positions (D4) and hexa deuteration at the 4-, 5-, and 6-caprolactone ring positions (D6). All the PCLs showed a similar lamellar structure and parameters. Differential scanning calorimetry (DSC) analysis revealed that the equilibrium melting temperature T 0 m , melting temperature T m , crystallization temperature T c , and crystallization kinetics changed systemically with the deuterium content except for D4, which indicates that the presence of CD 2 moieties on either side of ester group in the polymer chain combined with isotopic inhomogeneity could influence the chain packing. The nonmonotonic trend of T m as a function of deuterium content could be attributed to the difference in a hydrogen-bond like intermolecular interaction between different PCLs. Partially deuterated PCLs (D4 and D6) showed an Avrami index near 2. After analyzing the parameters at the same supercooling temperature ΔT c , the existence of two crystallization regimes of PCLs were detected.

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Section: Introductionmentioning

confidence: 99%