A strained elastomer, such as a pulled rubber band, actuates force as it tries to recover its original shape. Rubbers exhibit low actuation stress (<1 MPa, at 100% programmed strain). Herein, our ductile glassy networks exhibited high actuation forces, contributed by both the H-bonding network and the covalent network. Several recent reports show that heavily H-bonded linear polymers exhibit high stress in the range of 5-13 MPa, as demonstrated by Jing, Leng, Pretsch, and Bao. We measured the actuation stress for the meta-phthalamide with varying crosslinking densities, as well as the urethane and ester control groups. Specimen were "programmed" at T<Tg to reach 100%-500% tensile strain. Subsequently, the "programmed" samples were held at the same strain, while the force was recorded as the samples contracted during a heating cycle (Figure ).