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  <xs:element id="avnt_UnpaidContractualObligationsForHostingFeesPreTaxCharge" abstract="false" name="UnpaidContractualObligationsForHostingFeesPreTaxCharge" nillable="true" xbrli:periodType="duration" xbrli:balance="debit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="avnt_WorkforceReductionsMember" abstract="true" name="WorkforceReductionsMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="avnt_PlantClosingAndOtherMember" abstract="true" name="PlantClosingAndOtherMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="avnt_ClariantColorAcquisitionIntegrationRestructuringPlanMember" abstract="true" name="ClariantColorAcquisitionIntegrationRestructuringPlanMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="avnt_RestructuringReservePaymentsUtilizationAndForeignCurrencyTranslation" abstract="false" name="RestructuringReservePaymentsUtilizationAndForeignCurrencyTranslation" nillable="true" xbrli:periodType="duration" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="avnt_IncomeTaxExaminationEstimateOfPossibleLossInterest" abstract="false" name="IncomeTaxExaminationEstimateOfPossibleLossInterest" nillable="true" xbrli:periodType="duration" xbrli:balance="debit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="avnt_IncomeTaxExaminationEstimateOfPossibleLossPenalty" abstract="false" name="IncomeTaxExaminationEstimateOfPossibleLossPenalty" nillable="true" xbrli:periodType="duration" xbrli:balance="debit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="avnt_RevolvingCreditFacilityDue2030Member" abstract="true" name="RevolvingCreditFacilityDue2030Member" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="avnt_SeniorTermLoanDue2029Member" abstract="true" name="SeniorTermLoanDue2029Member" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="avnt_A5.75SeniorNotesDue2030Member" abstract="true" name="A5.75SeniorNotesDue2030Member" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="avnt_A6.250SeniorNotesDue2031Member" abstract="true" name="A6.250SeniorNotesDue2031Member" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="avnt_LongTermDebtCurrentMaturitiesPrincipalAmount" abstract="false" name="LongTermDebtCurrentMaturitiesPrincipalAmount" nillable="true" xbrli:periodType="instant" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="avnt_DebtInstrumentUnamortizedDiscountPremiumAndDebtIssuanceCostsCurrent" abstract="false" name="DebtInstrumentUnamortizedDiscountPremiumAndDebtIssuanceCostsCurrent" nillable="true" xbrli:periodType="instant" xbrli:balance="debit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="avnt_LongTermDebtExcludingCurrentMaturitiesPrincipalAmount" abstract="false" name="LongTermDebtExcludingCurrentMaturitiesPrincipalAmount" nillable="true" xbrli:periodType="instant" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="avnt_DebtInstrumentUnamortizedDiscountPremiumandDebtIssuanceCostsNoncurrent" abstract="false" name="DebtInstrumentUnamortizedDiscountPremiumandDebtIssuanceCostsNoncurrent" nillable="true" xbrli:periodType="instant" xbrli:balance="debit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="avnt_JPMorganChaseBankCreditFacilityMember" abstract="true" name="JPMorganChaseBankCreditFacilityMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="avnt_RevolvingCreditFacilityDue2026Member" abstract="true" name="RevolvingCreditFacilityDue2026Member" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="avnt_LineOfCreditFacilityAdditionalBorrowingCapacity" abstract="false" name="LineOfCreditFacilityAdditionalBorrowingCapacity" nillable="true" xbrli:periodType="instant" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="avnt_CalvertCityMember" abstract="true" name="CalvertCityMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="avnt_AccrualForEnvironmentalLossContingenciesNumberOfCompaniesNegotiatingConsentDecree" abstract="false" name="AccrualForEnvironmentalLossContingenciesNumberOfCompaniesNegotiatingConsentDecree" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="xbrli:integerItemType"/>
  <xs:element id="avnt_EnvironmentalRemediationExpenseConstructionBidCostsBeforeRecovery" abstract="false" name="EnvironmentalRemediationExpenseConstructionBidCostsBeforeRecovery" nillable="true" xbrli:periodType="duration" xbrli:balance="debit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="avnt_EnvironmentalRemediationExpenseExtensionPeriod" abstract="false" name="EnvironmentalRemediationExpenseExtensionPeriod" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="xbrli:durationItemType"/>
  <xs:element id="avnt_ProceedsFromInsuranceRecoveries" abstract="false" name="ProceedsFromInsuranceRecoveries" nillable="true" xbrli:periodType="duration" xbrli:balance="debit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
</xs:schema>
