Preparation and Characterization of Head-to-Head Polymers. 5. Head-to-Head Polystyrene

Abstract

Preparation and Characterization of Head-to-Head Polymers 1331 of an amide linkage and a tetrahydropyran ring along the chains. Possible molecular arrangements providing all hydrogen bonds are ideally regularly formed between polymer chains are illustrated in Figure 7. In the presence of water hydrogen bond interactions must exist between the water molecules and the amide groups. The ring ether oxygens may also interact with the water molecules.Poly(BOL) film has been found to exhibit some extent of permeability and permselectivity for alkali metal ions in water. Further work is in progress on the properties of poly-(BOL) and will be published in the near future.Acknowledgment. Thanks are given to Mr. M. Ito for his help in the experimental work.References and Notes U) . K.

Head‐to‐head polymers. XXXVI: Synthesis and polymerization of 2,3‐di[1(or 2)‐naphthyl]butadiene‐1,3

“…2,2-Azobisisobutyronitrile (AIBN) was purified as previously described [6]. 2,2-Azobisisobutyronitrile (AIBN) was purified as previously described [6].…”

“…The polymerization of 2,3-diphenylbutadiene-1,3 had been examined earlier [6,7]; it was found that radical polymerization using AIBN as the initiator led to 1,4-polymers of high molecular weight but with no geometric isomer preference. Anionic polymerization gave only 1,2polymer, not the desired 1,4-polymer; in addition, only crosslinked polymer was obtained in moderate yield [6].…”

Head-to-head polymers

“…[21][22][23] This method is the method of choice for preparing normal H-H polyolefins that have hydrogen atoms as one of the other substituents on the carbons atoms (eq 5): H-H PP was synthesized with the 1,4-polymerization of 2,3-dimethylbutadiene (DMB), which produced poly-1,4-(2,3-dimethylbutadiene-1,3) (PMDB). 24 -28 PDMB with a pure 1,4-structure was obtained through the polymerization of DMB with a trialkylaluminum-titanium tetrachloride initiator system.…”

“…26 Blends of H-H PSt and H-T PSt that had nearly the same T g (Table I; H-H, T g ϭ 97°C; H-T, T g ϭ 98°C) were also completely miscible. 21,62 …”

Oxacycloalkane in der polymerchemie. VIII. Über Sequenzlängen in Copoly(1,3‐dioxacyclanen)

“…[5] sowie OPITZ[6][7][8] wird die lH-NMR-Spektroskopie zur hufklarung der Mikrostruktur von 1,3,5-Trioxan/1,3-Dioxolan-Copolymeren benutzt. Es wird eine Blockzahl R definiert, die der hnzahl von A-B-bzw.…”