Showing papers in "Polymer Photochemistry in 1984"

TL;DR: In this paper, a photopolymerizable thiol-ene system was generated by a pulsed laser source and recorded on a differential scanning calorimeter and a specially designed thin-foil heat-flow meter.

TL;DR: In this article, photoinitiated cationic polymerization by photosensitization of diphenyliodonium and triphenylsulfonium salts is shown to proceed by two distinct electron transfer processes: (1) direct electron transfer from excited-state photosensitizers, and (2) indirect electron transferring from photogenerated radicals.

TL;DR: In this article, light-induced refractive index changes are investigated in pure and photosensitised PMMA blocks, caused by photopolymerisation of the residual monomer of the samples.

TL;DR: In this paper, a quantitative study of the photooxidation of an ethylene-propylene copolymer has been performed and three topics are discussed: the influence of previous thermal oxidation on the rate of photooxification, the balance of all chemical reactions involved in the photo-oxidation, and the use of computer simulation to test the consistency of the usually proposed mode of action of hindered amine light stabilizers.

TL;DR: In this paper, photo-induced reactions of polycarbonate (PC) have been investigated by electron spin resonance (ESR), viscosity, ultra-violet (UV) and infra-red (IR) absorption measurements.

TL;DR: In this paper, the interaction during UV irradiation of hindered piperidine 2,2,6,6-tetra-methyl-4-piperidinol and its analogue 4-hydroxy-2.2.6.

TL;DR: In this article, the rotational mobility of the probe reflects the glass-rubber relaxation of the host matrix and the temperature dependence of the correlation times deduced from transient measurements can be described by the WLF equation.

TL;DR: In this article, it was shown that T-T annihilation is an important deactivation route between the glass temperature range and Tγ, where the rotation of α-methyl groups (PMMA) and of phenyl groups (PSt), respectively, commences.

TL;DR: In this article, the photooxidation of 19 epoxy-amine networks was studied by IR and UV spectrophotometry, the main changes result from the oxidative attack of aliphatic segments; the groups in the β or γ position relative to nitrogen lead to carbonyls, whereas those in the α position lead to amides.

TL;DR: In this article, the results of many time-resolved fluorescence measurements upon vinyl(aromatic polymers) in dilute solution excited by picosecond lasers are discussed, and some preliminary results on the models for these polymers, the dinaphthyl propanes, presented.

TL;DR: In this paper, the authors focus on the various hydroperoxides which appear as primary products in the photooxidation of polyolefins and polyamides and show that the photoinductive ability of these compounds cannot be completely excluded.

TL;DR: In this paper, the specific role of the different elements of the composition, especially the initiator and the monomer, is discussed, and the results of several polymerization experiments obtained under various conditions of irradiation (conventional sources, pulsed or continuous lasers).

TL;DR: In this paper, triarylsulfonium, diaryliodonium and triaryl sulfonium salts were used as co-initiators for the photopolymerization of acrylamide.

TL;DR: In this article, it was shown that aromatic azo compounds are effective light stabilizers for isoprene-styrene and butadiene-stylrene block copolymers.

TL;DR: In this article, copolymers of n.butyl methacrylate and GMA containing 11, 22, 40, and 51% GMA units were reacted quantitatively with methacrylic acid, producing copolymer with side-groups.

TL;DR: In this article, the photochemical equilibrium between closed and open forms of 6-NO2-BIPS was found to depend both on pH and charge density in the membrane, which is responsible for the potential signal and depends on pH, never reached values high enough to generate a Nernstian response.

TL;DR: In this paper, the kinetics of photodegradation of poly(vinyl chloride) and of chlorinated PVC films were studied both in the presence and in the absence of oxygen and quantum yields Φ of the major photochemical processes were determined.

TL;DR: In this article, the fluorescence from cationically prepared poly(N-vinyl carbazole) and a series of Nvinyl carazole-butyl vinyl ether copolymers has been investigated over the temperature range 90-300 K.

TL;DR: In this paper, an ESR study of the interaction of two hindered piperidines: bis(2,2,6,6-tetramethyl-4-piperidinyl)sebacate (Tinuvin 770) and bis(1,2.2.6, 6, 6-pentamethyl- 4-Piperidinoxy radicals (4-PIC) with diethylketone, benzophenone, tert-butylhydroperoxide, and di-tert-Butylperoxide

TL;DR: In this paper, the concept of dielectric enrichment was extended from the liquid to the solid state if it is assumed that the solvent shell which stabilizes the ground state is frozen in the polymer and cannot be changed during the lifetime of excited states.

TL;DR: In this article, it was shown that in the presence of ZnCl 2 the polymerization rate of phenyl acrylate (PhA) can be accelerated to 477 litres and 688 litres, respectively.

TL;DR: Triblock copolymers with cellulose triester end-blocks were prepared by radical polymerization of styrene, chloroprene and acrylic acid esters with a cellulose-triester macrophotoinitiator.

TL;DR: In this paper, a photoinitiated polymerization method was developed for preparing pressure-sensitive adhesives directly on the backing substrate by using a transparent covering film which can then be peeled off prior to application of the adhesive to a substrate.

TL;DR: In this article, photopolymerization of acrylonitrile in the presence of aniline derivatives was investigated at 30°C in N,N-dimethylformamide and dimethylsulfoxide under irradiation with light of λ > 300 nm.

TL;DR: In this article, a systematic dielectric study over the frequency range 60 to 3×105 Hz has been carried out on natural rubber samples mixed with different fillers after being exposed to high energy γ-irradiation.

TL;DR: In this paper, the problems with conventional recording systems and the advantages of the new materials are described and the importance of the polymer films in increasing hologram efficiency as well as photosensitivity are discussed.

TL;DR: In this article, the authors used a computer assisted simulation taking into account the geometrical characteristics of optical fibers to obtain a homogeneous hardness of composite materials in the cured tooth cavity.

TL;DR: In this paper, the synthesis of epoxy-based resins and chlorides of substituted derivatives of cinnamic acid in non-aqueous pyridine was discussed. But the structure of the epoxyesters was not discussed.

TL;DR: In this article, two types of predegraded PVC film with different electronic spectra were obtained, and the possible stabilization mechanisms occurring in the photooxidation of type R films were discussed on the basis of both kinetic data and results obtained on model systems (β-carotene in a PVC matrix).