ADDITIVES | MATERIALS
have uneven dispersion of additives, such as plasticisers, stabilisers, and fillers. This inconsist- ency can result in variations in material properties, which makes it difficult to achieve reliable perfor- mance when using the rPVC in new products. In addition, the mechanical properties of PVC can degrade over multiple recycling cycles, reducing its durability and limiting the number of times it can be reused. Sunjong Kim, Director of Commercial Technology at CJ Biomaterials, said that the addition of aPHA to the rPVC formula improves processability and mechanical performance, which enables manufacturers to incorporate higher levels of rPVC while maintaining product quality and consistency. “More than 150 types of PHA can be created, depending on the type and composition of the monomers. APHA is a softer, rubbery version of PHA with a high molecular weight,” said Kim. “Adding small amounts of aPHA to PVC can significantly alter its physical properties, enhancing flexibility and performance, as aPHA is fully miscible in PVC with no phase separation. The miscibility enhances mechanics and rheology for processing PVC, while also improving polymer
chains’ molecular mobility with a reduction in glass transition temperature.” Incorporating aPHA into PVC enhances the mechanical properties and improves moisture resistance in both unfilled and filled PVC formula- tions. “Due to the miscibility of aPHA with PVC, aPHA helps to fill the microporous structures in the PVC material and provide better homogeneity of the blend, which can reduce water penetration,” said Kim. “This is especially beneficial for construc- tion, outdoor environments, and applications where prolonged moisture exposure can weaken material integrity.” Kim said: “Loading PHA at a rate of 5phr
improves impact resistance 30%, stiffness 54%, and tensile strength 18% over the post-industrial recycled control. The improved properties can be tailored with varying your blend and amounts of aPHA to increase the quantity of rPVC content used in a formulation while maintaining mechani- cal performance. This enhanced toughness with higher strength flexibility can be particularly useful in applications such as profiles, window frames, and doors.” Kim said that testing of aPHA in rigid PVC
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