Structure

Polyisobutylene

CAS
9003-27-4
Catalog Number
ACM9003274-10
Category
Main Products
Molecular Weight
56.10
Molecular Formula
[CH2C(CH3)2]n

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Specification

Synonyms
2-methyl-1-propenhomopolymer
Canonical SMILES
CC(C)=C
InChI
1S/C4H8/c1-4(2)3/h1H2,2-3H3,VQTUBCCKSQIDNK-UHFFFAOYSA-N
InChI Key
VQTUBCCKSQIDNK-UHFFFAOYSA-N
Appearance
Slab
Application
Polyisobutylene is a versatile synthetic polymer known for its unique properties and range of applications. This material is renowned for its low water diffusion rate and gas impermeability, setting it apart as the only rubber capable of retaining air for prolonged periods. As a result, it finds use in products such as tire inner tubes and the liners of sports balls. Due to its rubber-like consistency and resistance to acids, alkalis, and oxidation, polyisobutylene is employed in the manufacture of adhesives, fabric and paper coatings, and as a plasticizer in various rubber formulations. Its low glass transition temperature also makes it suitable as an encapsulation material in photovoltaic modules, enhancing their durability. Furthermore, highly reactive polyisobutylene is a crucial component in the production of lubricants and fuel additives, and its adaptability is further demonstrated through functionalization techniques that enable the creation of specialized block copolymers. Despite its limitations in self-supporting forms due to its tendency to cold flow, the polymer's inherent properties continue to support its widespread industrial use.
Storage
room temp
Form
chunks
MDL Number
MFCD00084436
Packaging
100, 250 g in poly bottle
Quality Level
100
Transition Temperature
Tg -64 °C

Preparation of Electrospun Fiber Mats Based on Polyisobutylene and Its Potential Medical Applications

Study results on the morphology, cytotoxicity, cell adhesion and anti-biofilm formation of polyisobutylene-based fiber mats. Pinchuk, Leonard. Bioactive materials 10 (2022): 185-194.

This paper reports initial testing results for a novel electrospun fiber mat utilizing polyisobutylene (PIB) as its unique macromolecular base. Self-supporting mats (203.75 and 295.5 g/m²) were electrospun from a PIB compound containing zinc oxide (ZnO). Results indicate the hydrophobic mats are non-cytotoxic, resist fibroblast adhesion and biofilm formation, and offer comfort and breathability suitable for masks. These properties highlight the mats' significant potential for personal protective equipment and other applications.
Performance of PIB-Based Fiber Mat
· Cytotoxicity: Statistical analysis showed that 24-hour exposure of cells to the mat release medium did not affect cell viability versus the control. However, 72-hour exposure reduced viable cells by approximately 25%. This indicates the ZnO-containing mats do not inhibit fibroblast growth but reduce their proliferation rate.
· Cell Adhesion: Two-photon microscopy revealed characteristic fibroblast staining (Vybrant DiD, red) was absent after both 24 h and 72 h incubations, suggesting no cell adhesion. The polymer and/or ZnO particles exhibited moderate green autofluorescence.
· Biofilm Formation: P. aeruginosa biofilm formation requires glucose, typically yielding optical density (OD595nm) values of 0.2-0.4 (up to 0.5 with added salt); inhibition reduces OD below 0.1. Figure 8 data demonstrate the tested mats effectively mitigated P. aeruginosa's biofilm-forming capacity.

Study on Phase State and Rheological Properties of Polyisobutylene and Silicone Resin Blends

Different phase states and viscosities of polyisobutylene and silicone resin blends. Ilyin, Sergey O., et al. Rheologica Acta 59 (2020): 375-386.

Silicone resins are hyperbranched, near-spherical macromolecules of nanometer size, featuring numerous terminal organic groups. This structure allows them to function as functionalized silica nanoparticles miscible within polymer matrices. This paper examines mixtures of linear polyisobutylene (PIB) with methyl-terminated (MT) silicone resin.
Key Findings
Linear PIB and silicone resin exhibit partial mutual solubility, quantitatively dependent on the resin's molecular weight and terminal group type. At low resin concentrations, homogeneous mixtures form molecular nanocomposites: a continuous PIB matrix with dispersed nanoscale resin particles (siloxane core, organic shell). Achieving such nanocomposites at higher nanoparticle concentrations requires chemical similarity between the polymer matrix and the hyperbranched molecules' terminal groups. For PIB, longer terminal hydrocarbon groups are necessary; methyl groups are insufficient for homogeneity across any significant concentration range.
Increasing temperature improves component solubility (the mixtures exhibit an Upper Critical Solution Temperature, UCST), but solubility remains limited. Heterogeneous mixtures form emulsions, which under shear and high disperse phase content, can develop co-continuous or cylindrical morphologies. Blend viscosity shows a negative deviation from logarithmic additivity due to interlayer slip. PIB viscosity reduction stems from both dissolving low-viscosity resin and interfacial slip. Consequently, no single classical empirical equation describes the blend's viscosity concentration dependence. This requires a combined equation accounting for the transition from mutual dissolution dominance to interlayer slip dominance as concentration changes.

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