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TPI for Tyres

    Rimpex Rubber supplies TPI for tyres innovation on less rolling resistance & less dynamic heat build-up & good fatigue performance & good wear resistance.

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  Medical Dental Grade TPI Granules, Synthetic Gutta-Percha, TransIsoprene Rubber, Trans PolyIsoprene, TPI, Trans-l,4-PolyIsoprene Medical Dental Grade TPI Granules, Synthetic Gutta-Percha, Trans PolyIsoprene, TPI, Trans Isoprene Rubber, Trans-1,4-PolyIsoprene China Largest Manufacturer Of Meteorological Balloons China Largest Manufacturer of Meteorological Balloons  

Trans-PolyIsoprene Rubber (TPI)--- New Materials for Manufacturing High Performance Tyres

Written by Professor Mr.Baochen Huang, Engineer Mr.Zhichao Zhao & Mr.Tao Deng
Translated by Rimpex Rubber, China

    Following with the rapid development of China rubber industry, especially tyres manufacturing, now China's rubber consumption has exceeded USA's, that is, China is No.1 rubber consumption country in the world, China used up 4,500,000 metric tons in 2006. While China produced rubbers bless than half of that, so China imported many rubbers yearly, especially natural rubber (NR), i.e., in 2006, China produced NR 530,000 metric tons while imported 1,615,000 metric tons, which was nearly 1/5 of global NR output, so int'l NR market prices were kept in high level which brought heavy burdens on rubber (tyres) industry. Such situation would sustain for some time. It is an important task for synthetic rubber industry & rubber processing industry to develop substitutes of NR to reduce NR's application proportion.

    PolyIsoprene Rubber is the most ideal substitue of NR because its chemical composition and structure is similar with NR, both of them are polymer of isoprene. PolyIsoprene Rubber has two kinds, one is Cis-1,4-PolyIsoprene, which is also called as isoprene rubber, abbreviated as IR, it is a well known universal rubber in market; another is Trans-1,4-PolyIsoprene (TPI), or called as Trans-Polyisoprene Rubber, it is a new materials to be introduced hereinafter.

    Trans-Polyisoprene Rubber, scientific name is Trans-1,4-PolyIsoprene (TPI), also called as synthetic gutta-percha, synthetic balata, it is directionally polymerizated from isoprene. So TPI is isomer of isoprene rubber (IR) and natural rubber (NR). At room temperatures, TPI has easy crystallinity, looks like thermoplastic but with soften point around 60 degrees Celsius only, so it could be used directly to form all kinds of medical splints, orthopaedic materials, prosthetic materials, exercise and rehabilitation protect tools, etc. No extra moulds are needed if adopting TPI as models for body. TPI's molecular chain is essentially some unsaturated flexible chain (Tg around -60 degrees Celsius), so TPI could be crosslinked with same vulcanization method of unsaturated rubbers. If the crosslinking density is not so high, TPI is shape memory materials, that is, at room temperature it is a plastic with fixed shape, while at +60 degrees Celsius it is rubber elastomer with big deformation capacity. If the crosslinking density reaches some extend, because crosslink provents crystallization, TPI is turned into rubber elastomer. So you could see, TPI shows its different performances at different vulcanization stages, which could be used as functional materials for different applications.

High Technology TPI Honoured
High Technology TPI Honoured
TPI Applications
TPI Applications
TPI Production Workshop
TPI Production Workshop
TPI Output
TPI Output

1. Vulcanizing Properties of Trans-Polyisoprene Rubber

    TPI has same C=C double bonds density with NR, so they could adopt same curing system and have similar vulcanizing properties. Because crosslinking points provent TPI chain-segments' crystallization, the vulcanized TPI shows different 3 stages' properties according to different crosslinking densities. (Refer to Table 1)

Table 1 - TPI's 3 Stages Properties & Applications

Vulcanization State
Crosslinking Agent Sulphur Dosage (Portion)