Abstract
A small amount of styrene‐maleic anhydride (SMA) copolymer was blended with polyamide‐6 (PA‐6). Polarized‐light microscope (PLM) observation and small angle light scattering (SALS) tests showed that the spherulite size of PA‐6/SMA was smaller than that of PA‐6. Differential scanning calorimetry (DSC) study showed that the crystallization process changed from thermal nucleation for PA‐6 to athermal nucleation for PA‐6/SMA. It was found in wide angle X‐ray diffraction (WAXD) tests that PA‐6/SMA tended to form α form crystals. Due to the smaller spherulite size and the stable crystal form, PA‐6/SMA had a lower water absorption rate, lower equilibrium water absorption, higher impact strength, and higher tensile strength than did virgin PA‐6. In addition, PA‐6/SMA showed higher melt elasticity and viscosity in rheology tests.
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