01669nas a2200181   4500008004100000245013900041210006900180260000800249300001600257490000700273520096400280100001701244700001801261700002201279700002001301700003801321856012801359       2016                        eng d00aLaser shielding and thermal ablation characteristics of resorcinol formaldehyde/boronnitride composites for thermal protection systems0 aLaser shielding and thermal ablation characteristics of resorcin  cOCT  a10645-106550 v553 aResorcinol formaldehyde (RF) composites were modified by incorporating different weight ratios of hexagonal boron nitride (h-BN) through a novel in situ polymerization technique. Temperature modulated SAXS was used to understand the changes in polymer network due to h-BN addition. The ablation performance of RF BN composites was evaluated by pulsed laser and oxyacetylene torch tests. Linear ablation resistance under oxyacetylene conditions improved by 18%. Laser ablation resistance increased by 44%. The reasons for improved ablation resistance for RF BN composites were studied using XRD, FTIR, and XPS methods which indicated that h-BN undergoes phase transformation at higher temperatures and also displays typical floral assimilation leading to significant energy consumption. This results in improved ablation resistance. These findings could lead to fabrication of RF BN based thermal protection systems (TPS) having better protection capabilities.1 aDaniel, Alex1 aBadhe, Yutika1 aSrikanth, Ivaturi1 aGokhale, Suresh1 aBalasubramanian, Kandasubramanian  uhttps://library.ncl.res.in/content/laser-shielding-and-thermal-ablation-characteristics-resorcinol-formaldehydeboronnitride