Structure and solubility of chlorinated poly(vinyl chloride) prepared by a gas–solid phase method

Abstract

Here, we modified the chlorination of a poly(vinyl chloride) (PVC) through a gas–solid phase method to prepare a highly soluble chlorinated PVC (CPVC). The structure of the CPVC was characterized by Fourier transform infrared spectroscopy, hydrogen‐1 nuclear magnetic resonance, gel permeation chromatography, and energy dispersive X‐ray spectroscopy, and the effects of molecular structure [gel content and vinylidene chloride (CCl2) molecular weight and distribution] on the solubility of CPVC were investigated. Results showed that molecular structures, such as CCl2, double bond, gel, molecular weight, and distribution had an effect on solubility, and the solubility of CPVC decreased with the increase in CCl2 content, number of double bonds, amount of gel, molecular weight, and distribution. The greater the degree of Inhomogeneous chlorination PVC particles or hydrochloride removal on the molecular chain is, the worse the solubility of CPVC is. © 2018 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2018, 135, 46880.

Improving the Energy Storage Performance of a Chlorinated Poly(vinyl chloride) Film at Elevated Electric Field and Temperature via a Simple Annealing Process

“… In addition, the characteristic groups of CPVC could be detected by FT-IR, such as the −CCl 2 – characteristic stretching vibration peak at 795 cm –1 and the C–Cl stretching vibration peak at 676 cm –1 , and the results are summarized in Table S3. As displayed in Figure c, after high-temperature annealing, the characteristic groups of CPVC have no obvious change except that the absorption peak of C–C at −CH 2 –CCl 2 –CH 2 – is significantly enhanced near 1062 cm –1 . , It is explained that the high-temperature annealing process promotes the movement and rearrangement of CPVC chain segments. With an increase of the heat treatment temperature, some unstable structures (such as −CCl 2 −) shift violently, and the interaction between polymer chains is enhanced.…”

“…As represented in Scheme , CPVC is produced by the chlorination of PVC, resulting in an uneven chlorine distribution in the polymer chain, and its sequence structure can be deduced from its 1 H NMR spectrum, which includes −CH 2 CHCl–, −CHClCHCl–, and −CHClCCl 2 –. Table specifically shows the random distribution of CPVC with chlorine structure . The resonance peak at 3.9–5.8 ppm is assigned to the proton of CHCl with an integral of A1, as presented in Figure a.…”

“…Table 1 specifically shows the random distribution of CPVC with chlorine structure. 33 The resonance peak at 3.9−5.8 ppm is assigned to the proton of CHCl with an integral of A1, as presented in Figure 1a. Besides, the signals at 2.6−3.4 and 1.9−2.6 ppm correspond to the protons of −CH 2 CCl 2 − and −CH 2 CHCl−, and the integral areas are recorded as A2 and A3, respectively.…”

Visible Blue LED Mediated Aqueous Photochlorination of PVC to CPVC: A Shrinking Core Kinetic Model and Experimental Study

“…15−17 (iv) The thermal process is initiated by thermal chlorine radical generation followed by chlorination of the PVC molecular chain. 18,19 Presently, nearly 85% of CPVC is globally produced by aqueous suspension photochlorination due to several advantages, like faster reaction rates and higher scalability factor, compared to dry solid-state fluidized bed photochlorination. Lubrizol, Kaneka, and most of the Chinese producers employ the aqueous suspension slurry chlorination process for commercial CPVC production.…”

“…In the solid-state process, inhomogeneous chlorination is observed as a result of potential maldistribution during fluidization. (iii) The suspension slurry process is where PVC powder is chlorinated in aqueous slurry. − (iv) The thermal process is initiated by thermal chlorine radical generation followed by chlorination of the PVC molecular chain. , Presently, nearly 85% of CPVC is globally produced by aqueous suspension photochlorination due to several advantages, like faster reaction rates and higher scalability factor, compared to dry solid-state fluidized bed photochlorination.…”