Polymerization of vinyl chloride and copolymerization with carbon monoxide by a new initiator

Kawai, Wassaburo; Ichihashi, Taichi

doi:10.1002/pol.1972.150100612

Cited by 12 publications

(1 citation statement)

References 9 publications

(1 reference statement)

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The dehydrochlorination reaction rate increases substantially upon the photolysis of thermally degraded PVC films with a large number of polyenes . Kawai and Ichihashi concluded that the peroxides formed during heat treatment were the main sensitizers for PVC photooxidation and that unsaturated bonds, such as conjugated polyene sequences and carbonyl groups, could also increase the photosensitivity of PVC. However, there was a weak absorption of peroxides in the λ range 250–400 nm, and the polyene structures, once formed, became the major contributor to PVC photodegradation.…”

Section: Introductionmentioning

confidence: 99%

Synthesis of chloromethyl benzimidazole grafted polybenzimidazole with enhanced UV absorption and its effect as a stabilizer on the ultraviolet‐aging behaviors of poly(vinyl chloride) films

Zhang

et al. 2019

J of Applied Polymer Sci

View full text Add to dashboard Cite

Poly(vinyl chloride) (PVC) is particularly susceptible to UV damage, and its durability can be reduced substantially when it is exposed to outdoor environments. In this study, high-molecular-weight polybenzimidazole (PBI) was synthesized and then grafted with 2-chloromethyl benzimidazole. The polybenzimidazole grafted with 2-chloromethyl benzimidazole (PBI-g-CMBeIm) could absorb over 99% of UV light in the region 220-420 nm. Then, PVC-PBI-g-CMBeIm blend films were prepared by a solution-casting method, and the effects of the PBI-g-CMBeIm content and UV-irradiation time on the properties of these films were investigated. The results show that the benzimidazole moieties incorporated into the macromolecular chain of PBI provided additional conjugation units, and this allowed the films to have a stronger UV absorption and broader λ range. The yield strength of the PVC-PBI-g-CMBeIm blend films irradiated for 1000 h ranged from 16.5 to 27.7 MPa; this increased 3.2-14.4 MPa compared with that of the pure PVC. The strength retention rate of the pure PVC was 28.8%, whereas that of the PVC-PBI-g-CMBeIm blend films was in the range 34.1-55.2%. The addition of PBI-g-CMBeIm also effectively increased the thermal degradation temperature of the blend films and slowed down their thermal degradation rate.

show abstract

Section: Introductionmentioning

confidence: 99%

Synthesis of chloromethyl benzimidazole grafted polybenzimidazole with enhanced UV absorption and its effect as a stabilizer on the ultraviolet‐aging behaviors of poly(vinyl chloride) films

Zhang

et al. 2019

J of Applied Polymer Sci

View full text Add to dashboard Cite

show abstract

Photodehydrochlorination of carbon monoxide–vinyl chloride copolymer

Kawai¹,

Ichihashi²

1974

J. Polym. Sci. Polym. Chem. Ed.

View full text Add to dashboard Cite

In order to examine effect of the carbonyl group in carbon monoxide–vinyl chloride copolymer, poly(CO–VC), photoirradiation with a high‐pressure mercury lamp on the copolymer was carried out. Poly(CO–VC) had a rate of dehydrochlorination three times that of PVC, and the reaction involved a decrease in chlorine content. Also there was a marked change in the ultraviolet spectra of the photoirradiated films. However, no pronounced change of molecular weight was observed, but a change in Rf in TLC was observed clearly. These facts confirmed that photoirradiation of poly(CO–VC) produced a structural change by dehydrochlorination without serious decrease of molecular weight. In addition, photodehydrochlorination of the copolymer or PVC film was followed kinetically, and after ozonolysis of the dehydrochlorinated polymers, the number‐average molecular weights were measured. From the results of degree of dehydrochlorination and molecular weight, the number average of conjugated double bonds or carbonyl groups was estimated. A mechanism for dehydrochlorination process by photo‐irradiation is suggested.

show abstract

New routes for copolymerization of carbon monoxide with styrene or vinyl chloride and photodegradation of these copolymers in solutions

Kawai

Ichihashi

1974

J. Polym. Sci. Polym. Chem. Ed.

View full text Add to dashboard Cite

New routes for copolymerization of carbon monoxide with styrene or vinyl chloride were found by emulsion polymerization (nonionic or ionic emulsifier). These procedures yielded copolymers containing carbonyl groups even at high conversion. These carbonyl‐containing polyketones were photoirradiated in solvent. In carbon monoxide—styrene copolymer of high molecular weight, the viscosity change produced by photoirradiation was especially remarkable, while in carbon monoxide—vinyl chloride copolymer no pronounced change in viscosity was observed, even at high contents of carbonyl group.

show abstract

Polymerization of vinyl chloride and copolymerization with carbon monoxide by a new initiator

Cited by 12 publications

References 9 publications

Synthesis of chloromethyl benzimidazole grafted polybenzimidazole with enhanced UV absorption and its effect as a stabilizer on the ultraviolet‐aging behaviors of poly(vinyl chloride) films

Synthesis of chloromethyl benzimidazole grafted polybenzimidazole with enhanced UV absorption and its effect as a stabilizer on the ultraviolet‐aging behaviors of poly(vinyl chloride) films

Photodehydrochlorination of carbon monoxide–vinyl chloride copolymer

New routes for copolymerization of carbon monoxide with styrene or vinyl chloride and photodegradation of these copolymers in solutions

Contact Info

Product

Resources

About