Physico-mechanical properties and cell microstructure of cross-linked PVC/organoclay nanocomposite foams prepared at various processing conditions

Most of the polymers made from fossil fuels end up as waste material and this environment-damaging situation has revealed the need to take some precautions such as the use of eco-friendly, biodegradable materials obtained from renewable sources as an alternative. Biopolymers are being evaluated as alternatives to traditional polymers especially in the automotive industry due to their better-understood properties such as mechanical and physical behavior through the studies conducted. On the other hand, when the literature studies are evaluated, it can be seen that the production of foam materials, which are focused on lightness and carbon dioxide (CO2) emission limitations that are important and essential for the automotive sector, is an area that is also researched and studied for biopolymers. Several studies are carried out with both physical and chemical foaming agents on this subject in recent years. In this study, it is aimed to develop light, environmentally friendly, high-performance polylactic acid (PLA) based polymeric composite foams that can be used in the automotive industry by using twin screw extruder and compression molding methods. For this purpose, polyamide 6 (PA6) and polypropylene (PP) polymers were used with PLA and by adding 1 wt.%, 1.5 wt.% and 2 wt.% chemical blowing agents to the polymer mixtures, the physical, thermal, mechanical, morphological properties and changes in these properties were investigated. The most suitable chemical blowing agent ratio was found to be 1.5 wt.% for PLA/PP and PLA/PA6 mixtures.

Section: Resultsmentioning

confidence: 99%

Chemical foaming of polylactic acid/polypropylene and polylactic acid/polyamide 6: Evaluation of changes in their properties

TUNA>

Akkoyun

2023

“…Polyvinyl chloride resin (PVC), one of the outstanding engineering plastics, has received broad attention in industrial applications due to its remarkable properties such as chemical corrosion resistance and strong mechanical properties. [1][2][3] However, PVC has several drawbacks, including poor processability and durability, which severely limit the applications of PVC. Numerous researchers have investigated strategies to surmount the shortcomings of PVC, such as blending with plasticizers or toughening agents, etc.…”

Section: Introductionmentioning

confidence: 99%

Novel high-efficiency Poly(butyl acrylate-co-2-ethylhexyl acrylate) grafting of Poly(methyl methacrylate) impact modifier: Synthesis and application

Sun

Liu

et al. 2022

Polyacrylate latexes with uniform particle size and excellent dispersion were successfully synthesized via emulsion copolymerization of butyl acrylate and 2-ethylhexyl acrylate with different types of grafting agents. The effect of grafting agent type for residual double bonds of seed latex was discussed. The results indicated that the residue double bonds of acrylic seed latex of graft agents with non-equally active double bonds were higher than acrylic seed latex of graft agents with equally active double bonds. Acrylic impact modifiers (ACR) were generated by using an emulsion grafting polymerization of polyacrylate latex as the core and poly (methyl methacrylate) (PMMA) as the shell for preparing poly(vinyl chlorid) (PVC)/ACR blends. Mechanical properties test analysis shows that the PVC/ACR blend reached a brittle-toughness transition when the ACR content was 8 phr, indicating that modifiers play a good toughening role in the matrix. The highest impact strength of PVC toughened through ACR (dicyclopentenyl acrylate as grafting agent) was 1682 J/m, almost 62 times than the pure PVC, whereas only 45 times than the pure PVC that of traditional ACR prepared PVC/ACR blend. Scanning electron microscope graphs showed that the shear yielding of the matrix was the major toughening mechanisms.

Application of titanium dioxide nanorod (TNr)@SiO₂ with low photocatalytic effect and high UV resistance in poly(vinyl chloride) film

Cheng,

Shi,

Dong

et al. 2024

Ultraviolet (UV) radiation has a detrimental effect on the outdoor lifetime of PVC film materials. TiO2 nanoparticles, as commonly used UV absorbers, still suffer from poor transparency, high photocatalytic effect, and poor dispersion in PVC matrix. To mitigate these effects effectively, titanium dioxide nanorod @ silicon dioxide (TNr@SiO2) was synthesized and used as an anti-UV aging agent for polyvinyl chloride (PVC). The agglomeration effects of TiO2 nanoparticles in PVC films were solved by synthesizing TNr, and the catalytic effects of TiO2 was reduced by growing SiO2 on the TNr surface. Scanning electron microscopy, Fourier transform infrared spectroscopy, X-ray diffraction, X-ray photoelectron spectroscopy, and UV-visible spectroscopy were utilized to demonstrate the excellent dispersion and low photocatalytic effects of the synthesized TNr@SiO2. Compared with pure PVC film, the color change of TNr@SiO2/PVC composite film is not evident after 800h of UV aging, and the retention of mechanical properties were 93.94%. Compared with TiO2/PVC, TNr@SiO2/PVC composite film has better transparency. Results show that TNr@SiO2 can maintain the properties of PVC better because the electrons of TNr@SiO2 are excited to form a positively charged hole after the absorption of UV light, and then the hole electron pairs are recombined and converted into thermal energy, which improves the durability of PVC. Therefore, this highly transparent TNr@SiO2/PVC composite film with low photocatalytic activity and high UV resistance will soon be applied in large-scale industrial production.