Thermoelectric (TE) materials based on conjugated/conductive polymers can directly convert heat into electricity, and thus found promising applications in energy scavenging and cooling technologies. The performance of these thermoelectric materials is governed by different parameters like the nature of the material, thermal stability, electrical conductivity, Seebeck coefficient, and thermal conductivity. Although the traditional inorganic semiconductor materials such as PbTe (Lead Telluride), Bi2Te3 (Bismuth Telluride), SiGe (Silicon-Germanium), SnSe (Tin Selenide), and Skutterudite (CoAs2) are giving high performance, they have some inherent limitations, such as poor processability, toxicity, rare availability, and high cost of manufacturing. Whereas, organic conjugated polymers such as polyacetylene (PA), polyaniline (PANi), Poly(3-hexylthiophene) (P3HT), polypyrrole (PPy), poly 3,4-ethylenedioxythiophene (PEDOT), etc. have low cost of synthesis, light in weight, low toxicity and better processibility. Organic textile thermoelectric generators (T-TEG) can be prepared by in-situ polymerization of the conjugated polymers onto textile substrates. This article reviews the preparation, design and performance of these T-TEGs. Various approaches and scopes of improvement of efficiency of the thermoelectric effect of the T-TEGs are discussed. Various potential applications of the T-TEG in different fields are also described.

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The migration characteristics of open-end and sheath fibres of core-sheath friction spun yarn have been studied using the tracer fibre technique. In open-end friction spun yarns, migration parameters were studied in both two-dimensional and three-dimensional projection methods. From the analysis, it has been observed that three-dimensional studies give higher mean fibre position (MFP), root mean square (RMS) deviation and mean migration intensity (MMI) than two-dimensional studies. The results show that fibres from first sliver feeding position have significantly higher MFP, RMS deviation and MMI than fifth sliver feeding position. The results also show that trailing half of fibres for first sliver feeding position has higher MFP, RMS deviation and MMI than leading half of fibres for both types of yarns. The migration parameters are mainly influenced by suction air pressure followed by opening roller speed and difference in drum speed for both open-end and core-sheath friction yarns. In open-end friction yarns for first and fifth sliver feeding positions, the experimental variables show different trends for MFP and RMS deviation.

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