Poly(4-methylstyrene)

Catalog NumberHG-BULK24936412

CAS Number24936-41-2

CategoryPolymers

Molecular Weight

Mw ~550 - 660kDa

Appearance

White powder

Application

High-Temperature Applications: Improved heat resistance suitable for microwave food containers and automotive heat-resistant components (headlight housings, sensor brackets).; Functional Materials: Hydrophobic properties enable corrosion-resistant coatings (contact angle >90°) for marine equipment; compounded with carbon black to produce antistatic packaging for protecting precision electronic components.; Green Packaging: Low-density foamed insulating materials (thermal conductivity 0.03-0.04 W/m·K) contribute to building energy efficiency.

Storage

Keep in a cool, dark, and dry place

Specification

96% min

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Case Study

Poly(4-methylstyrene) as a Model Polymer for Studying Photodegradation and Plasticizer Effects

Al Safi, Saria A., et al. Materials Sciences and Applications 1 (2014): 358-368.

Poly(4-methylstyrene) (PMS) serves as a substituted polystyrene derivative to investigate photodegradation mechanisms under UV irradiation. Its susceptibility to chain scission, photo-oxidation, and crosslinking is influenced by the para-methyl substituent and by blending with phthalate or terephthalate plasticizers.
Experimental Protocol: Pure and plasticized PMS thin films (≈0.02 mm) were cast from dichloroethane. Blending used 1-4 wt% of dibutyl phthalate (DBP), dioctyl phthalate (DOP), dimethyl terephthalate (DMT), diethyl terephthalate (DET), or dioctyl terephthalate (DOT). Films were irradiated in air at 265 nm (0-4 h). UV-Vis, fluorescence, and FT-IR spectra were recorded. Photodegradation kinetics were analyzed using the Al Ani-Hawi relation.
Performance Evaluation: Irradiation increased UV absorption and caused a new broad band (284-310 nm), indicating conjugated photoproducts. Excimer fluorescence (λ ≈ 316 nm) decreased with exposure time; a new broad emission (380-500 nm) appeared, attributed to polyene units. FT-IR showed increased bands at 3440 cm^-1 (hydroxyl), 1714 cm^-1 (carbonyl), and 830 cm^-1 (conjugated double bonds), confirming photo-oxidation. Phthalate plasticizers (especially DBP) accelerated photodegradation more than terephthalates. Photo-quenching rate constants (k_PQ) ranged from 0.011 to 0.142 min^-1; higher values correlated with faster degradation.

Poly(4-methylstyrene) as an Internal Standard for Quantification of Tire Wear Particles by Pyrolysis-GC/MS

Chae, Eunji, et al. Elastomers and Composites 59.4 (2024): 129-136.

Poly(4-methylstyrene) (PMS) serves as a cost-effective, non-deuterated internal standard for the quantification of natural rubber (NR) in environmental samples using pyrolysis-gas chromatography/mass spectrometry (Py-GC/MS). Its main pyrolysis products are well separated from NR markers and provide excellent calibration linearity.
Experimental Protocol: NR samples (2-20 µg) and PMS (3 µg) were placed in a quartz tube and pyrolyzed at 590 °C for 10 s under helium. Pyrolysis products were separated on a DB-5MS column and identified by EI-MS (70 eV). Calibration curves were constructed using peak areas of NR markers (isoprene and dipentene) alone or corrected with PMS monomer (4-methylstyrene) or dimeric products.
Performance Evaluation: The main PMS pyrolysis products were 4-methylstyrene (monomer), 1,3-bis(4-methylphenyl) propane, 2,4-bis(4-methylphenyl) butene, and 2,4-bis(4-methylphenyl) penta-1,4-diene (dimers). No peak overlap between PMS and NR was observed. Using monomer correction gave R2 = 0.976 (isoprene) and 0.988 (dipentene). Dimeric products significantly improved linearity: for isoprene, R2 reached 0.998, 0.999, and 0.999 respectively; for dipentene, R2 = 0.986, 0.994, and 0.994. The most abundant dimer (2,4-bis(4-methylphenyl) butene) is recommended for optimal calibration.
Conclusion: Poly(4-methylstyrene) is a reliable, low-cost internal standard for quantifying rubber components in tire wear particles, enabling accurate environmental monitoring.

• Molecular Weight: Mw ~550 - 660kDa
• Appearance: White powder
• Application: High-Temperature Applications: Improved heat resistance suitable for microwave food containers and automotive heat-resistant components (headlight housings, sensor brackets).; Functional Materials: Hydrophobic properties enable corrosion-resistant coatings (contact angle >90°) for marine equipment; compounded with carbon black to produce antistatic packaging for protecting precision electronic components.; Green Packaging: Low-density foamed insulating materials (thermal conductivity 0.03-0.04 W/m·K) contribute to building energy efficiency.
• Storage: Keep in a cool, dark, and dry place
• Specification: 96% min