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. 2023 Jun 26;16(13):4600.
doi: 10.3390/ma16134600.

A Novel One-Step Reactive Extrusion Process for High-Performance Rigid Crosslinked PVC Composite Fabrication Using Triazine Crosslinking Agent@Melamine-Formaldehyde Microcapsules

Jinshun Zhao  1   2 , Chun Li  2 , Jiayang Sui  2 , Shuai Jiang  2 , Weizhen Zhao  2   3 , Shihao Zhang  1 , Rong Wu  2 , Jintong Li  2 , Xuhuang Chen  1
Affiliations

A Novel One-Step Reactive Extrusion Process for High-Performance Rigid Crosslinked PVC Composite Fabrication Using Triazine Crosslinking Agent@Melamine-Formaldehyde Microcapsules

Jinshun Zhao et al. Materials (Basel). .

Abstract

In this work, we propose, for the first time, a simple, fast, and efficient strategy to fabricate high-performance rigid crosslinked PVC composites by continuous extrusion. This strategy improves the poor processing fluidity of composites and solves the impossibility of conducting extrusion in one step via using microcapsule-type crosslinking agents prepared by in situ polymerization to co-extrude with PVC blends. The results demonstrate that the PVC/microcapsule composites were successfully prepared. Within the studied parameters, the properties of crosslinked PVC gradually increased with the addition of microcapsules, and its Vicat softening temperature increased from 79.3 °C to 86.2 °C compared with pure PVC. This study shows the possibility for the industrial scale-up of the extrusion process for rigid crosslinked PVC.

Keywords: crosslinking; extrusion; microcapsules; nanocomposites.

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Conflict of interest statement

The authors declare no conflict of interest.

Figures

Figure 1
Figure 1
Schematic synthesis of microcapsule-type crosslinking agents.
Figure 2
Figure 2
(a) FT–IR spectra and (b) Raman spectra of MF, DB@MF, and DB.
Figure 3
Figure 3
Contact angle analysis of (a) DB, (b) DB@MF, and (c) MF.
Figure 4
Figure 4
(a) Heat weight loss curves and (b) DTG curves of MF, DB@MF, and DB.
Figure 5
Figure 5
(a) XPS spectra of DB and DB@MF with different shell/core ratios. (b) EA of DB@MF with different shell/core ratios. High-resolution XPS spectra of (c) N 1s and (d) S 2p.
Figure 6
Figure 6
SEM micrographs of (a) DB, (b) DB@MF-1, (c) DB@MF-2 and (d) DB@MF-3. (e) TEM-EDX mapping of DB@MF-3.
Figure 7
Figure 7
The torque diagram of PVC with (a) different shell/core ratios of DB@MF, (c) different additions of DB@MF–3, and (e) different processing speeds. The storage modulus and tan delta of PVC with (b) different shell/core ratios of DB@MF, (d) different additions of DB@MF–3, and (f) different processing speeds.
Figure 8
Figure 8
SEM micrographs of (a) 0 phr, (b) 10 phr. (c,d) SEM-EDX mapping of 10 phr.
See this image and copyright information in PMC

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