</s> ▁A ▁cross brid ging ▁agent ▁is ▁a ▁dif unt ional ▁mole c ule ▁that , ▁through ▁a ▁chemical ▁reaction , ▁joins ▁polym er ic ▁materials ▁together ▁that ▁are ▁on ▁opposite ▁sides ▁of ▁an ▁interface . ▁ ▁Un like ▁cross link ing , ▁cross brid ging ▁does ▁not ▁join ▁two ▁polym er ▁ch ains ▁to ▁form ▁a ▁single ▁continuous ▁piece ▁of ▁rub ber ▁during ▁the ▁vul can ization ▁process . ▁ ▁R ather , ▁the ▁rub ber ▁remains ▁distinct , ▁separated ▁by ▁an ▁interface ; ▁however , ▁a ▁strong ▁c oval ent ▁or ▁ion ic ▁bond ▁is ▁typically ▁created . ▁ ▁Category : Pol ym ers <0x0A> </s> ▁Ad ag io ▁City ▁A par th ot el ▁is ▁a ▁joint ▁vent ure ▁launched ▁by ▁Acc or Hot els ▁and ▁Pierre ▁& ▁V ac ances , ▁and ▁is ▁a ▁major ▁hotel ▁company ▁offering ▁rooms ▁with ▁cook ing ▁facilities . ▁ ▁History ▁Ad ag io ▁City ▁A par th ot el ▁is ▁a ▁joint ▁vent ure ▁launched ▁by ▁Acc or Hot els ▁and ▁Pierre ▁& ▁V ac ances ▁in ▁October ▁ 2 0 0 7 . ▁It ▁man ages ▁resid ences ▁and ▁apart ments ▁to ▁rent ▁in ▁tour ist ▁cities . ▁The ▁city ▁resid ences ▁correspond ▁to ▁business ▁travel ers ▁on ▁a ▁long ▁term ▁assignment ▁but ▁also ▁French ▁or ▁foreign ▁families ▁on ▁vac ation , ▁who ▁can ▁use ▁their ▁k itch ens ▁in ▁these ▁apart ments ▁and ▁avoid ▁restaurant ▁exp enses . ▁Urban ▁tour ism ▁has ▁a ▁much ▁higher ▁growth ▁rate ▁than ▁the ▁overall ▁average