Direct determination of stem length for chain-folded lamellar polymer crystals grown from solution: ozonolysis-g.p.c. measurements

Control of Self-Assembled Structures in Binary Mixtures of A−B Diblock Copolymer and A−C Diblock Copolymer by Changing the Interaction between B and C Block Chains

“…After the reaction, hydrogenated polymers were purified by the reprecipitation into methanol for a few times to remove the unreacted TSH. No gelation and no degradation were observed by gel permeation chromatography (GPC) measurement, and the random distribution of saturated ethylenepropylene units in the HPI block was confirmed by ozonolysis−GPC measurement . The detailed effect of the hydrogenation on the physical properties of block copolymer will be described elsewhere…”

“…No gelation and no degradation were observed by gel permeation chromatography (GPC) measurement, and the random distribution of saturated ethylenepropylene units in the HPI block was confirmed by ozonolysis-GPC measurement. 29 The detailed effect of the hydrogenation on the physical properties of block copolymer will be described elsewhere. 30 A series of PS-HPI having various p from 10 to 60 mol % were synthesized.…”

Synthetic Uniform Polymers and Their Use for Understanding Fundamental Problems in Polymer Chemistry

“…A topochemical approach toward almost uniform polymers has already been realized by Tanaka and his co-workers on diene polymers. [74,75] That is, ozonolysis of chain-folded lamellar crystals of cis-and trans-1,4-polyisoprenes and 1,4-polybutadienes gave the oligomers, the molecular weights of which most closely corresponded to the lamellar thickness, as the reaction occurred selectively on the fold parts of the lamellar surface. The resulting oligomers had a very narrow MWD and could be easily fractionated into uniform oligomers by SEC.…”

“…The resulting oligomers had a very narrow MWD and could be easily fractionated into uniform oligomers by SEC. [74,75] The template-controlled oligomerization of MMA was reported as an experimental approach that utilizes a large rigid spacer template to fix the positions of an initiating functionality and a terminating one (Scheme 11). [76] In this oligomerization reaction, propagation is expected to occur only within the initiator-terminator gap, and molecular weight of the resultant oligomer should depend solely on the template size.…”

“…This degradation of poly[( R )‐3‐hydroxybutyrate] indicates the possibility of preparation of an almost uniform polymer by a topochemical reaction of the lamellar crystal. A topochemical approach toward almost uniform polymers has already been realized by Tanaka and his co‐workers on diene polymers 74,75. That is, ozonolysis of chain‐folded lamellar crystals of cis ‐ and trans ‐1,4‐polyisoprenes and 1,4‐polybutadienes gave the oligomers, the molecular weights of which most closely corresponded to the lamellar thickness, as the reaction occurred selectively on the fold parts of the lamellar surface.…”