Thermodynamic characteristics of poly(cyclohexylethylene‐b‐ethylene‐co‐ethylethylene) block copolymers

Abstract

A series of poly(cyclohexylethylene-b-ethylene-coethylethylene) (C-E/E E ) diblock copolymers containing approximately 50% by volume glassy C blocks and varying fraction (x) of E E repeat units, 0.07x 0.90, was synthesized by anionic polymerization and catalytic hydrogenation. The effects of ethyl branch content on the melt state segment-segment (v) interaction parameter and soft (E/E E ) block crystallinity were studied. The percent crystallinity ranged from approximately 30% at x ¼ 0.07 to 0% at about x ! 0.30, while the melting temperature changed from 101 C at x ¼ 0.07 to 44 C at x ¼ 0.28. Dynamic mechanical spectroscopy was employed to determine the order-disorder transition (ODT) temperatures, from which v was calculated assuming the mean-field prediction (vN n ) ODT ¼ 10.5. Previously published results for the temperature dependent binary interaction parameters for C-E (x ¼ 0.07), C-E E (x ¼ 0.90), and E-E E (x ¼ 0.07 and x ¼ 0.90) fail to account for the quantitative x dependence of v, based on a simple binary interaction model.

Hierarchical microphase separation in bicontinuous ternary polymer blends

“…Recent studies in our group have sought to explore a variety of multiblock chain architectures that can be produced from a small number of commercially viable monomers. [27][28][29][30][31][32][33][34][35] These polymers, containing glassy polycyclohexylethylene (C), semicrystalline polyethylene (E), and rubbery polyethylethylene (E E ) or poly(ethylene-alt-propylene) (P), are produced by hydrogenation of anionically synthesized unsaturated precursor polymers. Simple multiblock sequences such as CECEC have been shown to have highly desirable mechanical and optical properties.…”

Polymerization-Induced Nanostructural Transitions Driven by In Situ Polymer Grafting

“…In a typical experiment, PS-PBD, styrene, 4-hydroxy-TEMPO, and benzoyl peroxide (BPO), are added together and stirred to create a homogeneous mixture. The PS-PBD diblock copolymer was synthesized by living anionic polymerization . The number average molecular weight ( M n ), volume fraction of PS ( f PS ), dispersity ( Đ ), and 1,4 versus 1,2PBD microstructural content for the PS-PBD were 27.5 kg/mol, 0.58, 1.03, and 0.94 1,2PBD, respectively (Supporting Information).…”

A study on the phase behavior of poly(ε-caprolactone)-poly(butadiene) diblock copolymers: The influence of relatively low-molecular-weight block copolymers on the order-disorder transition behavior

“…As for chemical nature of the block copolymers, there was not a significant difference between hydrocarbon block copolymer, such as PCHE-(PE/PEE) in ref. 50, and block copolymers which have polar molecules in one block component, such as PLA-PEP in ref. 19.…”

“…Temperature dependence of c Method employed PS-PI [14] c ¼ À0.0857 þ 71.4/T turbidity [36,45] c ¼ À0.0419 þ 38.5/T SAXS [39] a ¼ À0.00118 þ 0.839/T a turbidity [43] c ¼ À0.0197 þ 34.1/T SAXS [44] c ¼ À0.079 þ 54/T rheology PEO-PBO [16] c ¼ À0.0617 þ 51.6/T SAXS PE-PEE [17] c ¼ À0.0055 þ 15/T SAXS PLA-PEP [19] c ¼ À0.64 þ 445/T rheology PLA-PI [20] c ¼ À0.38 þ 29.4/T rheology PS-P2VP [21] c ¼ À0.095 þ 91.6/T rheology [46] a ¼ À1.79 Â 10 À4 þ0.478/T a SAXS PEO-PPO [22] c ¼ À0.122 þ 66.8/T SAXS PEP-PEE [25] c ¼ 0.0015 þ 51.6/T rheology PE-PEP [26] c ¼ À0.029 þ 14.4/T SANS P2VP-P4VP [47] a ¼ 1.64 Â 10 À3 þ0.236/T a SAXS PS-PMMA [48] c ¼ 0.0282 þ 4.46/T SAXS PEP-PDMS [49] c ¼ À0.0209 þ 41.4/T SAXS PC-(PE/PEE)x ¼ 0.07 [50] c ¼ À0.0175 þ 29.4/T rheology PC-(PE/PEE)x ¼ 0.9 [50] c ¼ À0. Fig.…”