Zylon, PBO

Zylon (PBO fiber) represents the next generation of fibers with strength and moduli nearly twice as high as those of p-aramide fibers... 

Syscom Advanced Materials USA. Coated Zylon PBO base fiber and Vectran Liberator fiber... 

Fig. 24 The strength versus the modulus curves for PBO fibres calculated for three different critical shear stress values and the observed strength of PBO (Zylon) given by the manufacturer... 

Properties Aramid Carbon Arom. polyester PBO Zylon PI PD M5 Cellulose0 POKfc Carilon Gel-spun PE PA-6 PETP E-glass Steel... 

The reinforcing fabrics used were aramid (Kevlar DuPont) and poly(p-pheny-lene-2,6-benzobisoxazole) (PBO) (Zylon Toyobo). The fabrics were first treated with a 1.5% solution of HB PAMAM (AD-102), dried, then interleaved with an epoxy film structural adhesive (epoxy stage B on polyester net), and compression-molded for 90 min at 120 °C. For the aramid-based composite, FM-73 (Cy-tec) was used as the matrix. For the PBO-based composite, AF-191 (3M) was used as the matrix. The laminates were cut into strips and tested for interlaminar shear strength (ASTM D-2344) using a three-point bending instrament. 

P-phenylene-2.6-tenzobisoxazole (PBO) is a semicrystalline polymer. The company Toyobo began production of this fiber in 1998 under the brand name Zylon . 

The modulus of elasticity of PBO fibers is higher than that of aramide fibers The heat resistance of Zylon is greater than that of the other fibers High level of resistance during heatup... 

Table 34 compares the properties of PBO fibers (Zylon ) with those of other fiber types. 

PBO, manufactured commercially as Zylon, is produced by dry-jet wet spinning from solution in phosphoric acid. The five membered rings on either side of the benzene ring give a stiffer chain molecule (Fig. 7.9). ... 

These fibre-formimg polymers are so-called ladder polymers and possess wholly aromatic polymer chains. The two common examples available commercially are the polybenzimidazole FBI (Intertek, formerly Celanese) with the full chemical name poly (2,2 -(m-phenylene)-5,5 -bibenzimidazole) and the polybenzoxazole Zylon (Toyobo) with the full chemical name polyfpara-phenylene benzobisoxazole) and generic acronym PBO. Their similarity in polymer chain stractures and high degrees of... 

Zylon (Toyobo, Japan) or PBO is a more recently developed fibre than PBl with a similarly rigid stracture free of any potentially fuel-forming aliphatic C-H groups ... 

Technical Information Bulletin, PBO Rber Zylon , Toyobo Co. Ltd., revised... 

Zylon or PBO is a more recently developed fibre than PBI and has outstanding tensile properties, as well as thermal and fire properties superior to any of the polymer-based fibres mentioned in this chapter (see Table 4.2). While there are at least two variants of the fibre, Zylon-AS and Zylon-HM, of which the latter has the higher modulus, both have the same thermal and burning parameter values. Principal examples of thermally protective textiles include heat protective clothing and aircraft fragment/heat barriers, where its price, similar to that of PBI, restricts its use to applications where strength, modulus and fire resistance are at a premium. 

There are two grades of PBO fiber, with tensile strengths and moduli almost double those of aramid fibers. The fiber also has attractive strain-to-failure ratios and low moisture regain. The fiber is now manufactured in Japan, and it is marketed by Toyobo under the tradename Zylon. 

Other types of fibre having potential use in ballistic protection include PBO (Zylon), which has superb mechanical properties, but its tensile strength has been found to be susceptible to degradation under certain extreme temperature and humidity conditions. The M5 fibre is claimed to be stronger and lighter than aramids and UHMWPE as well as most current armour materials in personal armour systems, but is found to have similar problems to PBO. 

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